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• JavaCV IplImage to LWJGL Texture

  - by rendrag

  As a side project I've been attempting to make a dynamic display (for example a screen within a game) that shows images from my webcam. I've been messing around with JavaCV and LWJGL for the past few months and have a basic understanding of how they both work. I found this after scouring google, but I get an error that the ByteBuffer isn't big enough. IplImage img = cam.getFrame(); ByteBuffer buffer = img.asByteBuffer(); int textureID = glGenTextures(); //Generate texture ID glBindTexture(GL_TEXTURE_2D, textureID); //Bind texture ID //I don't know how much of the following is necessary //Setup wrap mode glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL12.GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL12.GL_CLAMP_TO_EDGE); //Setup texture scaling filtering glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); //Send texture data to OpenGL - this is the line that actually does stuff and that OpenGL has a problem with glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL12.GL_BGR, GL_UNSIGNED_BYTE, buffer); That last line throws this- Exception in thread "Thread-0" java.lang.IllegalArgumentException: Number of remaining buffer elements is 144, must be at least 921600. Because at most 921600 elements can be returned, a buffer with at least 921600 elements is required, regardless of actual returned element count at org.lwjgl.BufferChecks.throwBufferSizeException(BufferChecks.java:162) at org.lwjgl.BufferChecks.checkBufferSize(BufferChecks.java:189) at org.lwjgl.BufferChecks.checkBuffer(BufferChecks.java:230) at org.lwjgl.opengl.GL11.glTexImage2D(GL11.java:2845) at tests.TextureTest.getTexture(TextureTest.java:78) at tests.TextureTest.update(TextureTest.java:43) at lib.game.AbstractGame$1.run(AbstractGame.java:52) at java.lang.Thread.run(Thread.java:679)

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• XNA Required information to represent 2D Sprite graphically

  - by Fire-Dragon-DoL

  I was thinking about dividing my game engine into 2 threads: render thread and update thread (I can't come up on how to divide update thread from physic thread at the moment). That said, I have to duplicate all Sprite informations, what do I really need to represents a 2D Sprite graphically? Here are my ideas (I'll mark with ? things that I'm not sure): Vector2 Position float Rotation ? Vector2 Pivot ? Rectangle TextureRectangle Texture2D Texture Vector2 ImageOrigin ? (is it tracked somewhere else?) If you have any suggestion about using different types for datas, it's appreciated Last part of the question: isn't this a lot of data to copy in a buffer?what should I really copy in the buffer?I'm following this tutorial: http://www.sgtconker.com/2009/11/article-multi-threading-your-xna/3/ Thanks UPDATE 1: Newer values at the moment: Vector2 Position float Rotation Vector2 Pivot Rectangle TextureRectangle Texture2D Texture Color Color byte Facing (can be left or right, I'll do it with an enum) I re-read the tutorial, what I was doing wrong is not that I need to pass all those values, I need to pass only changed values as messages. UPDATE 2: Vector2 Position float Rotation Vector2 Pivot Rectangle TextureRectangle Texture2D Texture Color Color bool Flip uint DrawOrder Vector2 Scale bool Visible ? Mhhh, should Visibile be included?

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• .NET Properties - Use Private Set or ReadOnly Property?

  - by tgxiii

  In what situation should I use a Private Set on a property versus making it a ReadOnly property? Take into consideration the two very simplistic examples below. First example: Public Class Person Private _name As String Public Property Name As String Get Return _name End Get Private Set(ByVal value As String) _name = value End Set End Property Public Sub WorkOnName() Dim txtInfo As TextInfo = _ Threading.Thread.CurrentThread.CurrentCulture.TextInfo Me.Name = txtInfo.ToTitleCase(Me.Name) End Sub End Class // ---------- public class Person { private string _name; public string Name { get { return _name; } private set { _name = value; } } public void WorkOnName() { TextInfo txtInfo = System.Threading.Thread.CurrentThread.CurrentCulture.TextInfo; this.Name = txtInfo.ToTitleCase(this.Name); } } Second example: Public Class AnotherPerson Private _name As String Public ReadOnly Property Name As String Get Return _name End Get End Property Public Sub WorkOnName() Dim txtInfo As TextInfo = _ Threading.Thread.CurrentThread.CurrentCulture.TextInfo _name = txtInfo.ToTitleCase(_name) End Sub End Class // --------------- public class AnotherPerson { private string _name; public string Name { get { return _name; } } public void WorkOnName() { TextInfo txtInfo = System.Threading.Thread.CurrentThread.CurrentCulture.TextInfo; _name = txtInfo.ToTitleCase(_name); } } They both yield the same results. Is this a situation where there's no right and wrong, and it's just a matter of preference?

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• minecraft wont take keyboard input

  - by Drew S

  After upgrading to 13.10 FTB(minecraft) wont take keyboard input after login in. I can click the buttons but it will not let me type in a address on multiplayer, or copy/paste with mouse. Since upgrading I cannot run the other mod packs either, only the one I had installed from 13.04. I get this when running a new modpack: 2013-10-28 15:14:52 [INFO] [STDERR] Exception in thread "Minecraft main thread" java.lang.ExceptionInInitializerError 2013-10-28 15:14:52 [INFO] [STDERR] at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:355) 2013-10-28 15:14:52 [INFO] [STDERR] at net.minecraft.client.MinecraftAppletImpl.func_71384_a(SourceFile:56) 2013-10-28 15:14:52 [INFO] [STDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:733) 2013-10-28 15:14:52 [INFO] [STDERR] at java.lang.Thread.run(Thread.java:724) 2013-10-28 15:14:52 [INFO] [STDERR] Caused by: java.lang.ArrayIndexOutOfBoundsException: 0 2013-10-28 15:14:52 [INFO] [STDERR] at org.lwjgl.opengl.XRandR$Screen.<init>(XRandR.java:234) 2013-10-28 15:14:52 [INFO] [STDERR] at org.lwjgl.opengl.XRandR$Screen.<init>(XRandR.java:196) 2013-10-28 15:14:52 [INFO] [STDERR] at org.lwjgl.opengl.XRandR.populate(XRandR.java:87) 2013-10-28 15:14:52 [INFO] [STDERR] at org.lwjgl.opengl.XRandR.access$100(XRandR.java:52) 2013-10-28 15:14:52 [INFO] [STDERR] at org.lwjgl.opengl.XRandR$1.run(XRandR.java:110) 2013-10-28 15:14:52 [INFO] [STDERR] at java.security.AccessController.doPrivileged(Native Method) 2013-10-28 15:14:52 [INFO] [STDERR] at org.lwjgl.opengl.XRandR.getConfiguration(XRandR.java:108) 2013-10-28 15:14:52 [INFO] [STDERR] at org.lwjgl.opengl.LinuxDisplay.init(LinuxDisplay.java:618) 2013-10-28 15:14:52 [INFO] [STDERR] at org.lwjgl.opengl.Display.<clinit>(Display.java:135) 2013-10-28 15:14:52 [INFO] [STDERR] ... 4 more

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• Feed the Beast Ultimate black screen after login 13.04?

  - by Drew S

  I get a black screen after login feed the beast ultimate splash animation. I have tried the manual LWJGL upgrading, using different versions of java (6 and 7 openJDK). no matter what I get this 2013-06-28 15:23:17 [INFO] [STDERR] Exception in thread "Minecraft main thread" java.lang.ExceptionInInitializerError 2013-06-28 15:23:17 [INFO] [STDERR] at net.minecraft.client.Minecraft.a(Minecraft.java:356) 2013-06-28 15:23:17 [INFO] [STDERR] at asq.a(SourceFile:56) 2013-06-28 15:23:17 [INFO] [STDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:746) 2013-06-28 15:23:17 [INFO] [STDERR] at java.lang.Thread.run(Thread.java:722) 2013-06-28 15:23:17 [INFO] [STDERR] Caused by: java.lang.ArrayIndexOutOfBoundsException: 0 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.XRandR$Screen.<init>(XRandR.java:234) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.XRandR$Screen.<init>(XRandR.java:196) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.XRandR.populate(XRandR.java:87) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.XRandR.access$100(XRandR.java:52) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.XRandR$1.run(XRandR.java:110) 2013-06-28 15:23:17 [INFO] [STDERR] at java.security.AccessController.doPrivileged(Native Method) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.XRandR.getConfiguration(XRandR.java:108) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.LinuxDisplay.init(LinuxDisplay.java:618) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.Display.<clinit>(Display.java:135) 2013-06-28 15:23:17 [INFO] [STDERR] ... 4 more

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• Minecraft in jdk 1.7.0_u2 x64

  - by Nela Drobná

  I have Ubuntu 11.10 64-bit and I installed JDK 1.7.0 update 2 x64 via webupd8 page. But currently I have problem with minecraft game. After downloading launcher from Minecraft.net and lauch the game by java -jar /home/zrebec/Downloads/minecraft.jar launcehr is launched normaly, after login the game download the updates but then I got just the black screen with this in terminal: Setting user: zrebec, -356009615199623309 Exception in thread "Minecraft main thread" java.lang.UnsatisfiedLinkError: /home/zrebec/.minecraft/bin/natives/liblwjgl.so: /home/zrebec/.minecraft/bin/natives/liblwjgl.so: wrong ELF class: ELFCLASS32 (Possible cause: architecture word width mismatch) at java.lang.ClassLoader$NativeLibrary.load(Native Method) at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1928) at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1825) at java.lang.Runtime.load0(Runtime.java:792) at java.lang.System.load(System.java:1059) at org.lwjgl.Sys$1.run(Sys.java:69) at java.security.AccessController.doPrivileged(Native Method) at org.lwjgl.Sys.doLoadLibrary(Sys.java:65) at org.lwjgl.Sys.loadLibrary(Sys.java:81) at org.lwjgl.Sys.<clinit>(Sys.java:98) at org.lwjgl.opengl.Display.<clinit>(Display.java:132) at net.minecraft.client.Minecraft.a(SourceFile:180) at net.minecraft.client.Minecraft.run(SourceFile:648) at java.lang.Thread.run(Thread.java:722) Please anyone can help me with this? I think that problem will be in architecture becase: liblwjgl.so: /home/zrebec/.minecraft/bin/natives/liblwjgl.so: wrong ELF class: ELFCLASS32 (Possible cause: architecture word width mismatch) Any idea please? I know, maybe this one is off topic because maybe its not Ubuntu problem maybe but in 64-bit works all perfectly and I think that accepted answer can help to many users and can make better playing games under linux. Really. Thank you very much for any idea.

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• Android threads trouble wrapping my head around design

  - by semajhan

  I am having trouble wrapping my head around game design. On the android platform, I have an activity and set its content view with a custom surface view. The custom surface view acts as my panel and I create instances of all classes and do all the drawing and calculation in there. Question: Should I instead create the instances of other classes in my activity? Now I create a custom thread class that handles the game loop. Question: How do I use this one class in all my activities? Or do I have to create a separate instance of the extended thread class each time? In my previous game, I had multiple levels that had to create an instance of the thread class and in the thread class I had to set constructor methods for each separate level and in the loop use a switch statement to check which level it needs to render and update. Sorry if that sounds confusing. I just want to know if the method I am using is inefficient (which it probably is) and how to go about designing it the correct way. I have read many tutorials out there and I am still having lots of trouble with this particular topic. Maybe a link to a some tutorials that explain this? Thanks.

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• Android threads trouble wrapping my head around design

  - by semajhan

  I am having trouble wrapping my head around game design. On the android platform, I have an activity and set its content view with a custom surface view. The custom surface view acts as my panel and I create instances of all classes and do all the drawing and calculation in there. Question: Should I instead create the instances of other classes in my activity? Now I create a custom thread class that handles the game loop. Question: How do I use this one class in all my activities? Or do I have to create a separate thread each time? In my previous game, I had multiple levels that had to create an instance of the thread class and in the thread class I had to set constructor methods for each separate level and in the loop use a switch statement to check which level it needs to render and update. Sorry if that sounds confusing. I just want to know if the method I am using is inefficient (which it probably is) and how to go about designing it the correct way. I have read many tutorials out there and I am still having lots of trouble with this particular topic. Maybe a link to a some tutorials that explain this? Thanks.

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• How can I save state from script in a multithreaded engine?

  - by Peter Ren

  We are building a multithreaded game engine and we've encountered some problems as described below. The engine have 3 threads in total: script, render, and audio. Each frame, we update these 3 threads simultaneously. As these threads updating themselves, they produce some tasks and put them into a public storage area. As all the threads finish their update, each thread go and copy the tasks for themselves one by one. After all the threads finish their task copying, we make the threads process those tasks and update these threads simultaneously as described before. So this is the general idea of the task schedule part of our engine. Ok, well, all the task schedule part work well, but here's the problem: For the simplest, I'll take Camera as an example: local oldPos = camera:getPosition() -- ( 0, 0, 0 ) camera:setPosition( 1, 1, 1 ) -- Won't work now, cuz the render thread will process the task at the beginning of the next frame local newPos = camera:getPosition() -- Still ( 0, 0, 0 ) So that's the problem: If you intend to change a property of an object in another thread, you have to wait until that thread process this property-changing message. As a result, what you get from the object is still the information in the last frame. So, is there a way to solve this problem? Or are we build the task schedule part in a wrong way? Thanks for your answers :)

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• How to manage long running background threads and report progress with DDD

  - by Mr Happy

  Title says most of it. I have found surprising little information about this. I have a long running operation of which the user wants to see the progress (as in, item x of y processed). I also need to be able to pause and stop the operation. (Stopping doesn't rollback the items already processed.) The thing is, it's not that each item takes a long time to get processed, it's that that there are usually a lot of items. And what I've read about so far is that it's somewhat of an anti-pattern to put something like a queue in the DB. I currently don't have any messaging system in place, and I've never worked with one either. Another thing I read somewhere is that progress reporting is something that belongs in the application layer, but it didn't go into the details. So having said all this, what I have in mind is the following. User request with list of items enters the application layer. Application layer gets some information from the domain needed to process the items. Application layer passes the items and the information off to some domain service (should the implementation of this service belong in the infrastructure layer?) This service spins up a worker thread with callbacks for both progress reporting and pausing/stopping it. This worker thread will process each item in it's own UoW. This means the domain information from earlier needs to be stored in some DTO. Since nothing is really persisted, the service should be singleton and thread safe Whenever a user requests a progress report or wants to pause/stop the operation, the application layer will ask the service. Would this be a correct solution? Or am I at least on the right track with this? Especially the singleton and thread safe part makes the whole thing feel icky.

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• Ubuntu 64bit Black Screen on Minecraft

  - by Signify

  I have tried posting on the forums, but I really need help (I'm a server admin and really don't want to have to switch to Windows just to run Minecraft). Anyhow, I originally was running openjdk6 as I was told that 7 was unstable and was getting periodical lag spikes while walking (at least once every 3 seconds the screen would freeze for a tenth of a second). After that, I attempted to install Sun's Java JDK7 (I couldn't get ahold of 6 without signing up for Oracle's newsletters). Upon attempting to run Minecraft, I got a black screen after logging in with this error message: 27 achievements 182 recipes Setting user: Thunder7102, -1618112820878091307 Exception in thread "Minecraft main thread" java.lang.UnsatisfiedLinkError: /home/noiro/.minecraft/bin/natives/liblwjgl.so: /home/noiro/.minecraft/bin/natives/liblwjgl.so: wrong ELF class: ELFCLASS32 (Possible cause: architecture word width mismatch) at java.lang.ClassLoader$NativeLibrary.load(Native Method) at java.lang.ClassLoader.loadLibrary1(ClassLoader.java:1939) at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1864) at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1825) at java.lang.Runtime.load0(Runtime.java:792) at java.lang.System.load(System.java:1059) at org.lwjgl.Sys$1.run(Sys.java:69) at java.security.AccessController.doPrivileged(Native Method) at org.lwjgl.Sys.doLoadLibrary(Sys.java:65) at org.lwjgl.Sys.loadLibrary(Sys.java:81) at org.lwjgl.Sys.<clinit>(Sys.java:98) at org.lwjgl.opengl.Display.<clinit>(Display.java:132) at net.minecraft.client.Minecraft.a(SourceFile:184) at net.minecraft.client.Minecraft.run(SourceFile:657) at java.lang.Thread.run(Thread.java:722) Now, this got me fed up, so I tried to install a Windows 7 virtual machine through virtualbox, I gave it 256mb of graphics memory with 2D and 3D acceleration and 3GB of RAM. I installed Java JDK7 for Windows (which does work from experience on my other Windows 7 partition). Once again, a black screen after login. What the heck is going on guys? My System Specs: Ubuntu 12.04 64bit Fully Updated running Gnome3 Nvidia GTS 450 1.3GB OC'd AMD Athlon II 4x 2.8Ghz 6GB of RAM So, what do you think?

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• How exactly to implement multiple threads in a game

  - by xerwin

  So I recently started learning Java, and having a interest in playing games as well as developing them, naturally I want to create game in Java. I have experience with games in C# and C++ but all of them were single-threaded simple games. But now, I learned how easy it is to make threads in Java, I want to take things to the next level. I started thinking about how would I actually implement threading in a game. I read couple of articles that say the same thing "Usually you have thread for rendering, for updating game logic, for AI, ..." but I haven't (or didn't look hard enough) found example of implementation. My idea how to make implementation is something like this (example for AI) public class AIThread implements Runnable{ private List<AI> ai; private Player player; /*...*/ public void run() { for (int i = 0; i < ai.size(); i++){ ai.get(i).update(player); } Thread.sleep(/* sleep until the next game "tick" */); } } I think this could work. If I also had a rendering and updating thread list of AI in both those threads, since I need to draw the AI and I need to calculate the logic between player and AI(But that could be moved to AIThread, but as an example) . Coming from C++ I'm used to do thing elegantly and efficiently, and this seems like neither of those. So what would be the correct way to handle this? Should I just keep multiple copies of resources in each thread or should I have the resources on one spot, declared with synchronized keyword? I'm afraid that could cause deadlocks, but I'm not yet qualified enough to know when a code will produce deadlock.

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• How to handle multiple pages of the same site with the same outlinks

  - by pandafromchina

  I am developing a back link tool for Chinese SEO (our web site URL is: http://link.aizhan.com just like ahrefs.com. I encountered a problem which is how to handle multiple pages of the same site with the same out links. For example: Most pages of bbs.chinaz.com have the same out links such as: bbs.chinaz.com/Tea/thread-6293993-1-1.html bbs.chinaz.com/Tea/list-1.html bbs.chinaz.com/alimama/thread-6265032-1-1.html bbs.chinaz.com/alimama/thread-6265032-2-1.html?userid=-1&extParms= bbs.chinaz.com/Shuiba/list-1.html bbs.chinaz.com/FeedBack/thread-4456753-1-1.html etc.. All of the pages have the same out links in the top of the page: www.cnzz.com(anchor text:????) www.313.com(????) www.idc123.com(????) Suppose I store these outlinks into database. The SEO will find there are six backlinks from bbs.chinaz.com of www.cnzz.com. This is obviously no sense for the SEO. Can you tell me how do you deal with this problem?

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• Marking Discussions as Answered

  As a contributor to a number of projects on CodePlex I really like the fact that the discussions feature exists but also I need ways to help me sort the discussions threads so I can make sure no-one is getting forgotten about. Seems like a lot of you agreed as the feature request Provide feature to allow Coordinators to mark Discussions threads as 'Answered' is our number 2 voted feature right now with 178 votes.  Today we rolled out the first iteration of “answer” support to discussions. In this first iteration we wanted to keep it simple and lightweight. The original poster of the thread along with project owners, developers or editors can mark any post to the thread as an answer. You can have any number of answers marked in a thread and it’s very quick to mark or unmark a post as an answer.  We deliberately keep the answers in the originally posted order so that you can see them in context with the discussion thread. When viewing discussions the default view is still to see everything, but you can easily filter by “Unanswered”.  You can even save that as a bookmark so as someone interested in the project can quickly jump to the unanswered discussion threads to go help out on. As I mention, we kept this first pass of the answering feature as simple and as lightweight as possible so that we can get some feedback on it. Head on over to the issue tracking this feature if you have any thoughts once you have used it for a bit or feel free to respond in the comments. I already have a couple of things I think we want to do such as a refresh of the look and feel of discussions in general along, make it easier to navigate to posts that are marked an answered and surface posts that you do that were marked as answered in your profile page - but if you have ideas then please let us know.

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• How to dynamically override a method in an object

  - by Ace Takwas

  If this is possible, how can I change what a method does after I might have created an instance of that class and wish to keep the reference to that object but override a public method in it's class' definition? Here's my code: package time_applet; public class TimerGroup implements Runnable{ private Timer hour, min, sec; private Thread hourThread, minThread, secThread; public TimerGroup(){ hour = new HourTimer(); min = new MinuteTimer(); sec = new SecondTimer(); } public void run(){ hourThread.start(); minThread.start(); secThread.start(); } /*Please pay close attention to this method*/ private Timer activateHourTimer(int start_time){ hour = new HourTimer(start_time){ public void run(){ while (true){ if(min.changed)//min.getTime() == 0) changeTime(); } } }; hourThread = new Thread(hour); return hour; } private Timer activateMinuteTimer(int start_time){ min = new MinuteTimer(start_time){ public void run(){ while (true){ if(sec.changed)//sec.getTime() == 0) changeTime(); } } }; minThread = new Thread(min); return min; } private Timer activateSecondTimer(int start_time){ sec = new SecondTimer(start_time); secThread = new Thread(sec); return sec; } public Timer addTimer(Timer timer){ if (timer instanceof HourTimer){ hour = timer; return activateHourTimer(timer.getTime()); } else if (timer instanceof MinuteTimer){ min = timer; return activateMinuteTimer(timer.getTime()); } else{ sec = timer; return activateSecondTimer(timer.getTime()); } } } So for example in the method activateHourTimer(), I would like to override the run() method of the hour object without having to create a new object. How do I go about that?

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• ??????????/??????????????|WebLogic Channel|??????

  - by ???02

  WebLogic Server???????????????????????????????????????????????????????????????????????????1???????????????????????????????????????????????????WebLogic Server???????????????????????????????????????????????????????????????????????·?????????????????????·??????????????????????????????????????????????????2011?11????????Oracle DBA & Developers Days 2011??????????????????????????WebLogic Server??????????????????WebLogic Server???????????????????????????????????????????????????·?????????????????????????????2??????????????????????????????????????????????·??????????(???)?WebLogic Server??????????????????????　WebLogic Server????????????????????????????OS???JVM???WebLogic Server????????????????5????????????????WebLogic Server??????????????????????????????????????　????????·????????????????????WebLogic Server????????????????　?????????????????????????????????????Listen????????????????Listen????????Muxer??????????????·????·????????????????????????????????????????·????????????????·?????????????????????????????????????????????????????????????????????????????????JDBC?????????????????????????????????????¦???????????·??????????――?????·??????·???????????WebLogic?????　?????????????????????·?????????????????????????3????????????1????????·?????????????¦????????????! ?????????????????JRockit Flight Recorder?????????1??????????????――?????????????????　1??????????????????　???????????????????????????????????????????????????????·?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????　??????????????????????CPU??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????　??????????????????????????????????????????????????????????????????????????????????????¦????????????WebLogic Server - ???????·??????　????????????????????????WebLogic Server?????????????????????????????????????????????????????????????3???　??????????????????????????(????????)??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????　??3??????????????????????????????????????????????????????????????????????　????????????50~600???????????????100~500???????????????????????????????????????????????300??????????????????????200?400???????????????????????????　???50?100???????????????????????????????????????????????????????????????????????????????????????????500?600????????????????????????????????????????????????????????????????　??????????????????????????????50?100????????????500?600???????????????????100~500?????????????????????????????????????????200~400?????????????????????????????　???????????????????????????????????????????????????????????????????"????????"??????????????????????????JDBC?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????¦????WebLogic Server(JRockit) - ????????????????????????????????2???????????????――???????? ? ??????????????????　2???????????????????????????????????????????????????????????????????????????????????????????????????????????1???????????400??????(???????????????????????????????domain.xsd????????????????????????????????????????)?　???????????????????????????????????????????????????????????????????????????????????????????????????????????????????Dweblogic.SelfTuningThreadPoolSizeMin={???????}Dweblogic.SelfTuningThreadPoolSizeMax={???????}?????????????????<server>　　<name>MANAGED_SRV</name>　　<self-tuning-thread-pool-size-min>{???????}</self-tuning-thread-pool-size-min>　　<self-tuning-thread-pool-size-max>{???????}</self-tuning-thread-pool-size-max>　　...?...</server>　????????????????????????????????????????????????????????　??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????¦????????????WebLogic Server - ????????/????　?????1?????????????·???????????????????????????????????????????????????·??????????????????????????????????·?????????????0~2????????????????????????????????????????????????????????????????????????????????????????·???????????????????????????????????????????????????????????????????????????????????　??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????·???????????????????????????????????　???????????????????????????????????????????????????????????????????????????????????????????????????????????·????????????　???????????????????????????????????????????????????????????????????????·???????????????????????????????　????????????????WebLogic Server??????????????????????????????????????????????????????????????????????????????????????????????????????????????·??????????????　??????????????????????????2????????·??????????????????????2?????????????¦Oracle DBA & Developers Days 2011????????????????????WebLogic Server??????????????¦????·????Oracle WebLogic Server 12c Forum - ????????Java??????????? -??2012?1?25?13:30~17:00 ?? ????????????13F?????

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• Hung JVM consuming 100% CPU

  - by Bogdan

  We have a JAVA server running on Sun JRE 6u20 on Linux 32-bit (CentOS). We use the Server Hotspot with CMS collector with the following options (I've only provided the relevant ones): -Xmx896m -Xss128k -XX:NewSize=384M -XX:MaxPermSize=96m -XX:+UseParNewGC -XX:+UseConcMarkSweepGC Sometimes, after running for a while, the JVM seems to slip into a hung state, whereby even though we don't make any requests to the application, the CPU continues to spin at 100% (we have 8 logical CPUs, so it looks like only one CPU does the spinning). In this state the JVM doesn't respond to SIGHUP signals (kill -3) and we can't connect to it normally with jstack. We CAN connect with "jstack -F", but the output is dodgy (we can see lots of NullPointerExceptions from JStack apparently because it wasn't able to 'walk' some stacks). So the "jstack -F" output seems to be useless. We have run a stack dump from "gdb" though, and we were able to match the thread id that spins the CPU (we found that using "top" with a per-thread view - "H" option) with a thread stack that appears in the gdb result and this is how it looks like: Thread 443 (Thread 0x7e5b90 (LWP 26310)): #0 0x0115ebd3 in CompactibleFreeListSpace::block_size(HeapWord const*) const () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #1 0x01160ff9 in CompactibleFreeListSpace::prepare_for_compaction(CompactPoint*) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #2 0x0123456c in Generation::prepare_for_compaction(CompactPoint*) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #3 0x01229b2c in GenCollectedHeap::prepare_for_compaction() () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #4 0x0122a7fc in GenMarkSweep::invoke_at_safepoint(int, ReferenceProcessor*, bool) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #5 0x01186024 in CMSCollector::do_compaction_work(bool) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #6 0x011859ee in CMSCollector::acquire_control_and_collect(bool, bool) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #7 0x01185705 in ConcurrentMarkSweepGeneration::collect(bool, bool, unsigned int, bool) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #8 0x01227f53 in GenCollectedHeap::do_collection(bool, bool, unsigned int, bool, int) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #9 0x0115c7b5 in GenCollectorPolicy::satisfy_failed_allocation(unsigned int, bool) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #10 0x0122859c in GenCollectedHeap::satisfy_failed_allocation(unsigned int, bool) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #11 0x0158a8ce in VM_GenCollectForAllocation::doit() () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #12 0x015987e6 in VM_Operation::evaluate() () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #13 0x01597c93 in VMThread::evaluate_operation(VM_Operation*) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #14 0x01597f0f in VMThread::loop() () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #15 0x015979f0 in VMThread::run() () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #16 0x0145c24e in java_start(Thread*) () from /usr/java/jdk1.6.0_20/jre/lib/i386/server/libjvm.so #17 0x00ccd46b in start_thread () from /lib/libpthread.so.0 #18 0x00bc2dbe in clone () from /lib/libc.so.6 It seems that a JVM thread is spinning while doing some CMS related work. We have checked the memory usage on the box, there seems to be enough memory available and the system is not swapping. Has anyone come across such a situation? Does it look like a JVM bug? UPDATE I've obtained some more information about this problem (it happened again on a server that has been running for more than 7 days). When the JVM entered the "hung" state it stayed like that for 2 hours until the server was manually restarted. We have obtained a core dump of the process and the gc log. We tried to get a heap dump as well, but "jmap" failed. We tried to use jmap -F but then only a 4Mb file was written before the program aborted with an exception (something about the a memory location not being accessible). So far I think the most interesting information comes from the gc log. It seems that the GC logging stopped as well (possibly at the time when the VM thread went into the long loop): 657501.199: [Full GC (System) 657501.199: [CMS: 400352K->313412K(524288K), 2.4024120 secs] 660634K->313412K(878208K), [CMS Perm : 29455K->29320K(68568K)], 2.4026470 secs] [Times: user=2.39 sys=0.01, real=2.40 secs] 657513.941: [GC 657513.941: [ParNew: 314624K->13999K(353920K), 0.0228180 secs] 628036K->327412K(878208K), 0.0230510 secs] [Times: user=0.08 sys=0.00, real=0.02 secs] 657523.772: [GC 657523.772: [ParNew: 328623K->17110K(353920K), 0.0244910 secs] 642036K->330523K(878208K), 0.0247140 secs] [Times: user=0.08 sys=0.00, real=0.02 secs] 657535.473: [GC 657535.473: [ParNew: 331734K->20282K(353920K), 0.0259480 secs] 645147K->333695K(878208K), 0.0261670 secs] [Times: user=0.11 sys=0.00, real=0.02 secs] .... .... 688346.765: [GC [1 CMS-initial-mark: 485248K(524288K)] 515694K(878208K), 0.0343730 secs] [Times: user=0.03 sys=0.00, real=0.04 secs] 688346.800: [CMS-concurrent-mark-start] 688347.964: [CMS-concurrent-mark: 1.083/1.164 secs] [Times: user=2.52 sys=0.09, real=1.16 secs] 688347.964: [CMS-concurrent-preclean-start] 688347.969: [CMS-concurrent-preclean: 0.004/0.005 secs] [Times: user=0.00 sys=0.01, real=0.01 secs] 688347.969: [CMS-concurrent-abortable-preclean-start] CMS: abort preclean due to time 688352.986: [CMS-concurrent-abortable-preclean: 2.351/5.017 secs] [Times: user=3.83 sys=0.38, real=5.01 secs] 688352.987: [GC[YG occupancy: 297806 K (353920 K)]688352.987: [Rescan (parallel) , 0.1815250 secs]688353.169: [weak refs processing, 0.0312660 secs] [1 CMS-remark: 485248K(524288K)] 783055K(878208K), 0.2131580 secs] [Times: user=1.13 sys =0.00, real=0.22 secs] 688353.201: [CMS-concurrent-sweep-start] 688353.903: [CMS-concurrent-sweep: 0.660/0.702 secs] [Times: user=0.91 sys=0.07, real=0.70 secs] 688353.903: [CMS-concurrent-reset-start] 688353.912: [CMS-concurrent-reset: 0.008/0.008 secs] [Times: user=0.01 sys=0.00, real=0.01 secs] 688354.243: [GC 688354.243: [ParNew: 344928K->30151K(353920K), 0.0305020 secs] 681955K->368044K(878208K), 0.0308880 secs] [Times: user=0.15 sys=0.00, real=0.03 secs] .... .... 688943.029: [GC 688943.029: [ParNew: 336531K->17143K(353920K), 0.0237360 secs] 813250K->494327K(878208K), 0.0241260 secs] [Times: user=0.10 sys=0.00, real=0.03 secs] 688950.620: [GC 688950.620: [ParNew: 331767K->22442K(353920K), 0.0344110 secs] 808951K->499996K(878208K), 0.0347690 secs] [Times: user=0.11 sys=0.00, real=0.04 secs] 688956.596: [GC 688956.596: [ParNew: 337064K->37809K(353920K), 0.0488170 secs] 814618K->515896K(878208K), 0.0491550 secs] [Times: user=0.18 sys=0.04, real=0.05 secs] 688961.470: [GC 688961.471: [ParNew (promotion failed): 352433K->332183K(353920K), 0.1862520 secs]688961.657: [CMS I suspect this problem has something to do with the last line in the log (I've added some "...." in order to skip some lines that were not interesting). The fact that the server stayed in the hung state for 2 hours (probably trying to GC and compact the old generation) seems quite strange to me. Also, the gc log stops suddenly with that message and nothing else gets printed any more, probably because the VM Thread gets into some sort of infinite loop (or something that takes 2+ hours).

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• Fail to analyze core dump with GDB when main.elf is dynamically linked (uses shared libs)

  - by dscTobi

  Hi all. I'm trying to analyze core dump, but i get following result: GNU gdb 6.6.0.20070423-cvs Copyright (C) 2006 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "--host=mipsel-linux --target=mipsel-linux-uclibc". (gdb) file main.elf Reading symbols from /home/tobi/main.elf...Reading symbols from /home/tobi/main.dbg...done. done. (gdb) core-file /srv/tobi/core warning: .dynamic section for "/lib/libpthread.so.0" is not at the expected address (wrong library or version mismatch?) Error while mapping shared library sections: /lib/libdl.so.0: No such file or directory. Error while mapping shared library sections: /lib/librt.so.0: No such file or directory. Error while mapping shared library sections: /lib/libm.so.0: No such file or directory. Error while mapping shared library sections: /lib/libstdc++.so.6: No such file or directory. Error while mapping shared library sections: /lib/libc.so.0: No such file or directory. warning: .dynamic section for "/lib/libgcc_s.so.1" is not at the expected address (wrong library or version mismatch?) Error while mapping shared library sections: /lib/ld-uClibc.so.0: No such file or directory. Reading symbols from /lib/libpthread.so.0...done. Loaded symbols for /lib/libpthread.so.0 Symbol file not found for /lib/libdl.so.0 Symbol file not found for /lib/librt.so.0 Symbol file not found for /lib/libm.so.0 Symbol file not found for /lib/libstdc++.so.6 Symbol file not found for /lib/libc.so.0 Reading symbols from /lib/libgcc_s.so.1...done. Loaded symbols for /lib/libgcc_s.so.1 Symbol file not found for /lib/ld-uClibc.so.0 warning: Unable to find dynamic linker breakpoint function. GDB will be unable to debug shared library initializers and track explicitly loaded dynamic code. Core was generated by 'root/main.elf'. Program terminated with signal 11, Segmentation fault. #0 0x0046006c in NullPtr (parse_p=0x2ac9dc80, result_sym_p=0x13e3d6c "") at folder/my1.c:1624 1624 *ptr += 13; (gdb) bt #0 0x0046006c in NullPtr (parse_p=0x2ac9dc80, result_sym_p=0x13e3d6c "") at folder/my1.c:1624 #1 0x0047a31c in fn1 (line_ptr=0x2ac9dd18 "ccore_null_pointer", target_ptr=0x13e3d6c "", result_ptr=0x2ac9dd14) at folder/my2.c:980 #2 0x0047b9d0 in fn2 (macro_ptr=0x0, rtn_exp_ptr=0x0) at folder/my3.c:1483 /... some functions .../ #8 0x2aab7f9c in __nptl_setxid () from /lib/libpthread.so.0 Backtrace stopped: frame did not save the PC (gdb) thread apply all bt Thread 159 (process 1093): #0 0x2aac15dc in _Unwind_GetCFA () from /lib/libpthread.so.0 #1 0x2afdfde8 in ?? () warning: GDB cant find the start of the function at 0x2afdfde8. GDB is unable to find the start of the function at 0x2afdfde8 and thus cant determine the size of that functions stack frame. This means that GDB may be unable to access that stack frame, or the frames below it. This problem is most likely caused by an invalid program counter or stack pointer. However, if you think GDB should simply search farther back from 0x2afdfde8 for code which looks like the beginning of a function, you can increase the range of the search using the set heuristic-fence-post command. Backtrace stopped: previous frame inner to this frame (corrupt stack?) Thread 158 (process 1051): #0 0x2aac17bc in pthread_mutexattr_getprioceiling () from /lib/libpthread.so.0 #1 0x2aac17a0 in pthread_mutexattr_getprioceiling () from /lib/libpthread.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 157 (process 1057): #0 0x2aabf908 in ?? () from /lib/libpthread.so.0 #1 0x00000000 in ?? () Thread 156 (process 1090): #0 0x2aac17bc in pthread_mutexattr_getprioceiling () from /lib/libpthread.so.0 #1 0x2aac17a0 in pthread_mutexattr_getprioceiling () from /lib/libpthread.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 155 (process 1219): #0 0x2aabf908 in ?? () from /lib/libpthread.so.0 #1 0x00000000 in ?? () Thread 154 (process 1218): #0 0x2aabfb44 in connect () from /lib/libpthread.so.0 #1 0x00000000 in ?? () Thread 153 (process 1096): #0 0x2abc92b4 in ?? () warning: GDB cant find the start of the function at 0x2abc92b4. #1 0x2abc92b4 in ?? () warning: GDB cant find the start of the function at 0x2abc92b4. Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 152 (process 1170): #0 0x2aabfb44 in connect () from /lib/libpthread.so.0 #1 0x00000000 in ?? () If i make main.elf statically linked everything is OK and i can see bt of all threads. Any ideas?

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• Server 2008 Likes to restart itself

  - by Campo

  I have a weird issue here. I notice about once a week the web server restarts itself. This would be only a minor issue if we were not planning on implementing an IP failover. I have checked the event logs. I don't see anything that indicates a reason for the restart. I need some help diagnosing the reason the server restarts. It happened last night at 5:00AM Last even in the log was 1 hour before the unexpected shutdown. Here is the Log for the shutdown event. Any help is much appreciated. I know there isn't much to go on yet. Log Name: System Source: EventLog Date: 5/5/2010 5:01:12 AM Event ID: 6008 Task Category: None Level: Error Keywords: Classic User: N/A Computer: SERVERNAME Description: The previous system shutdown at 4:56:41 AM on 5/5/2010 was unexpected. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="EventLog" /> <EventID Qualifiers="32768">6008</EventID> <Level>2</Level> <Task>0</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2010-05-05T09:01:12.000Z" /> <EventRecordID>346094</EventRecordID> <Channel>System</Channel> <Computer>SERVERNAME</Computer> <Security /> </System> <EventData> <Data>4:56:41 AM</Data> <Data>5/5/2010</Data> <Data> </Data> <Data> </Data> <Data>39594</Data> <Data> </Data> <Data> </Data> <Binary>DA070500030005000400380029008E03DA070500030005000800380029008E033C0000003C000000000 000000000000000000000000000000100000000000000</Binary> </EventData> </Event>

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• InternalsVisibleTo attribute and security vulnerability

  - by Sergey Litvinov

  I found one issue with InternalsVisibleTo attribute usage. The idea of InternalsVisibleTo attribute to allow some other assemblies to use internal classes\methods of this assembly. To make it work you need sign your assemblies. So, if other assemblies isn't specified in main assembly and if they have incorrect public key, then they can't use Internal members. But the issue in Reflection Emit type generation. For example, we have CorpLibrary1 assembly and it has such class: public class TestApi { internal virtual void DoSomething() { Console.WriteLine("Base DoSomething"); } public void DoApiTest() { // some internal logic // ... // call internal method DoSomething(); } } This assembly is marked with such attribute to allow another CorpLibrary2 to make inheritor for that TestAPI and override behaviour of DoSomething method. [assembly: InternalsVisibleTo("CorpLibrary2, PublicKey=0024000004800000940000000602000000240000525341310004000001000100434D9C5E1F9055BF7970B0C106AAA447271ECE0F8FC56F6AF3A906353F0B848A8346DC13C42A6530B4ED2E6CB8A1E56278E664E61C0D633A6F58643A7B8448CB0B15E31218FB8FE17F63906D3BF7E20B9D1A9F7B1C8CD11877C0AF079D454C21F24D5A85A8765395E5CC5252F0BE85CFEB65896EC69FCC75201E09795AAA07D0")] The issue is that I'm able to override this internal DoSomething method and break class logic. My steps to do it: Generate new assembly in runtime via AssemblyBuilder Get AssemblyName from CorpLibrary1 and copy PublikKey to new assembly Generate new assembly that will inherit TestApi class As PublicKey and name of generated assembly is the same as in InternalsVisibleTo, then we can generate new DoSomething method that will override internal method in TestAPI assembly Then we have another assembly that isn't related to this CorpLibrary1 and can't use internal members. We have such test code in it: class Program { static void Main(string[] args) { var builder = new FakeBuilder(InjectBadCode, "DoSomething", true); TestApi fakeType = builder.CreateFake(); fakeType.DoApiTest(); // it will display: // Inject bad code // Base DoSomething Console.ReadLine(); } public static void InjectBadCode() { Console.WriteLine("Inject bad code"); } } And this FakeBuilder class has such code: /// /// Builder that will generate inheritor for specified assembly and will overload specified internal virtual method /// /// Target type public class FakeBuilder { private readonly Action _callback; private readonly Type _targetType; private readonly string _targetMethodName; private readonly string _slotName; private readonly bool _callBaseMethod; public FakeBuilder(Action callback, string targetMethodName, bool callBaseMethod) { int randomId = new Random((int)DateTime.Now.Ticks).Next(); _slotName = string.Format("FakeSlot_{0}", randomId); _callback = callback; _targetType = typeof(TFakeType); _targetMethodName = targetMethodName; _callBaseMethod = callBaseMethod; } public TFakeType CreateFake() { // as CorpLibrary1 can't use code from unreferences assemblies, we need to store this Action somewhere. // And Thread is not bad place for that. It's not the best place as it won't work in multithread application, but it's just a sample LocalDataStoreSlot slot = Thread.AllocateNamedDataSlot(_slotName); Thread.SetData(slot, _callback); // then we generate new assembly with the same nameand public key as target assembly trusts by InternalsVisibleTo attribute var newTypeName = _targetType.Name + "Fake"; var targetAssembly = Assembly.GetAssembly(_targetType); AssemblyName an = new AssemblyName(); an.Name = GetFakeAssemblyName(targetAssembly); // copying public key to new generated assembly var assemblyName = targetAssembly.GetName(); an.SetPublicKey(assemblyName.GetPublicKey()); an.SetPublicKeyToken(assemblyName.GetPublicKeyToken()); AssemblyBuilder assemblyBuilder = Thread.GetDomain().DefineDynamicAssembly(an, AssemblyBuilderAccess.RunAndSave); ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule(assemblyBuilder.GetName().Name, true); // create inheritor for specified type TypeBuilder typeBuilder = moduleBuilder.DefineType(newTypeName, TypeAttributes.Public | TypeAttributes.Class, _targetType); // LambdaExpression.CompileToMethod can be used only with static methods, so we need to create another method that will call our Inject method // we can do the same via ILGenerator, but expression trees are more easy to use MethodInfo methodInfo = CreateMethodInfo(moduleBuilder); MethodBuilder methodBuilder = typeBuilder.DefineMethod(_targetMethodName, MethodAttributes.Public | MethodAttributes.Virtual); ILGenerator ilGenerator = methodBuilder.GetILGenerator(); // call our static method that will call inject method ilGenerator.EmitCall(OpCodes.Call, methodInfo, null); // in case if we need, then we put call to base method if (_callBaseMethod) { var baseMethodInfo = _targetType.GetMethod(_targetMethodName, BindingFlags.NonPublic | BindingFlags.Instance); // place this to stack ilGenerator.Emit(OpCodes.Ldarg_0); // call the base method ilGenerator.EmitCall(OpCodes.Call, baseMethodInfo, new Type[0]); // return ilGenerator.Emit(OpCodes.Ret); } // generate type, create it and return to caller Type cheatType = typeBuilder.CreateType(); object type = Activator.CreateInstance(cheatType); return (TFakeType)type; } /// /// Get name of assembly from InternalsVisibleTo AssemblyName /// private static string GetFakeAssemblyName(Assembly assembly) { var internalsVisibleAttr = assembly.GetCustomAttributes(typeof(InternalsVisibleToAttribute), true).FirstOrDefault() as InternalsVisibleToAttribute; if (internalsVisibleAttr == null) { throw new InvalidOperationException("Assembly hasn't InternalVisibleTo attribute"); } var ind = internalsVisibleAttr.AssemblyName.IndexOf(","); var name = internalsVisibleAttr.AssemblyName.Substring(0, ind); return name; } /// /// Generate such code: /// ((Action)Thread.GetData(Thread.GetNamedDataSlot(_slotName))).Invoke(); /// private LambdaExpression MakeStaticExpressionMethod() { var allocateMethod = typeof(Thread).GetMethod("GetNamedDataSlot", BindingFlags.Static | BindingFlags.Public); var getDataMethod = typeof(Thread).GetMethod("GetData", BindingFlags.Static | BindingFlags.Public); var call = Expression.Call(allocateMethod, Expression.Constant(_slotName)); var getCall = Expression.Call(getDataMethod, call); var convCall = Expression.Convert(getCall, typeof(Action)); var invokExpr = Expression.Invoke(convCall); var lambda = Expression.Lambda(invokExpr); return lambda; } /// /// Generate static class with one static function that will execute Action from Thread NamedDataSlot /// private MethodInfo CreateMethodInfo(ModuleBuilder moduleBuilder) { var methodName = "_StaticTestMethod_" + _slotName; var className = "_StaticClass_" + _slotName; TypeBuilder typeBuilder = moduleBuilder.DefineType(className, TypeAttributes.Public | TypeAttributes.Class); MethodBuilder methodBuilder = typeBuilder.DefineMethod(methodName, MethodAttributes.Static | MethodAttributes.Public); LambdaExpression expression = MakeStaticExpressionMethod(); expression.CompileToMethod(methodBuilder); var type = typeBuilder.CreateType(); return type.GetMethod(methodName, BindingFlags.Static | BindingFlags.Public); } } remarks about sample: as we need to execute code from another assembly, CorpLibrary1 hasn't access to it, so we need to store this delegate somewhere. Just for testing I stored it in Thread NamedDataSlot. It won't work in multithreaded applications, but it's just a sample. I know that we use Reflection to get private\internal members of any class, but within reflection we can't override them. But this issue is allows anyone to override internal class\method if that assembly has InternalsVisibleTo attribute. I tested it on .Net 3.5\4 and it works for both of them. How does it possible to just copy PublicKey without private key and use it in runtime? The whole sample can be found there - https://github.com/sergey-litvinov/Tests_InternalsVisibleTo UPDATE1: That test code in Program and FakeBuilder classes hasn't access to key.sn file and that library isn't signed, so it hasn't public key at all. It just copying it from CorpLibrary1 by using Reflection.Emit

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• Android onTrackballEvent and Click

  - by Gaz

  Hi Everyone, I want to capture onClick events for the trackball on a HTC Hero. This event is firing and I can get the direction of motion of the trackball: @Override public boolean onTrackballEvent(MotionEvent event) { } How do I find out if the event was a click event?

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• Windows phone 7 grouped list

  - by Luke Lowrey

  I am new to silverlight and windows phone 7 development and am having some trouble working out the best way to do a "grouped list". Essentially what I would like to do is group a list of event details by date into something like this: Monday 5/6/10 event 1 event 2 Tuesday 6/6/10 event 3 I tried using nested listboxes which work to certain extent but killed the scrolling. Is that the best way to do grouping (assuming I can fix the scrolling issue) or is there some other method?

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• Detect ANY touch in a view (iPhone SDK)

  - by David

  Hello, I'm currently using ... - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { to detect swipes. I've got everything working. The only problem is if the user touches on top of something (eg a UIButton or something) the - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { is not called. Is there something like touchesBegan but will work if I touch ANYWHERE on the view? Thanks in advance, David

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• grails 1.3.1 Error executing script GenerateViews:

  - by mswallace

  Here is the lay of the land. I have an app that I have created. I uninstalled hibernate, installed app-engine plugin and am using jdo. I am able to create a domain-class but the when I run generate-all I run into the following error. Oh and I did try just generating the controller for the domain class and that seemed to work fine but then after that I try just generate-views on the same domain class and I also get the following error. Error executing script GenerateViews: java.lang.reflect.InvocationTargetException java.lang.reflect.InvocationTargetException at gant.Gant$_dispatch_closure5.doCall(Gant.groovy:391) at gant.Gant$_dispatch_closure7.doCall(Gant.groovy:415) at gant.Gant$_dispatch_closure7.doCall(Gant.groovy) at gant.Gant.withBuildListeners(Gant.groovy:427) at gant.Gant.this$2$withBuildListeners(Gant.groovy) at gant.Gant$this$2$withBuildListeners.callCurrent(Unknown Source) at gant.Gant.dispatch(Gant.groovy:415) at gant.Gant.this$2$dispatch(Gant.groovy) at gant.Gant.invokeMethod(Gant.groovy) at gant.Gant.executeTargets(Gant.groovy:590) at gant.Gant.executeTargets(Gant.groovy:589) Caused by: java.lang.reflect.InvocationTargetException at SimpleTemplateScript1.run(SimpleTemplateScript1.groovy:43) at _GrailsGenerate_groovy.generateForDomainClass(_GrailsGenerate_groovy:85) at _GrailsGenerate_groovy$_run_closure1.doCall(_GrailsGenerate_groovy:50) at GenerateViews$_run_closure1.doCall(GenerateViews.groovy:33) at gant.Gant$_dispatch_closure5.doCall(Gant.groovy:381) ... 10 more Caused by: java.lang.NoClassDefFoundError: org/hibernate/mapping/Value ... 15 more Caused by: java.lang.ClassNotFoundException: org.hibernate.mapping.Value at org.codehaus.groovy.tools.RootLoader.findClass(RootLoader.java:156) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at org.codehaus.groovy.tools.RootLoader.loadClass(RootLoader.java:128) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) ... 15 more --- Nested Exception --- java.lang.reflect.InvocationTargetException at SimpleTemplateScript1.run(SimpleTemplateScript1.groovy:43) at _GrailsGenerate_groovy.generateForDomainClass(_GrailsGenerate_groovy:85) at _GrailsGenerate_groovy$_run_closure1.doCall(_GrailsGenerate_groovy:50) at GenerateViews$_run_closure1.doCall(GenerateViews.groovy:33) at gant.Gant$_dispatch_closure5.doCall(Gant.groovy:381) at gant.Gant$_dispatch_closure7.doCall(Gant.groovy:415) at gant.Gant$_dispatch_closure7.doCall(Gant.groovy) at gant.Gant.withBuildListeners(Gant.groovy:427) at gant.Gant.this$2$withBuildListeners(Gant.groovy) at gant.Gant$this$2$withBuildListeners.callCurrent(Unknown Source) at gant.Gant.dispatch(Gant.groovy:415) at gant.Gant.this$2$dispatch(Gant.groovy) at gant.Gant.invokeMethod(Gant.groovy) at gant.Gant.executeTargets(Gant.groovy:590) at gant.Gant.executeTargets(Gant.groovy:589) Caused by: java.lang.NoClassDefFoundError: org/hibernate/mapping/Value ... 15 more Caused by: java.lang.ClassNotFoundException: org.hibernate.mapping.Value at org.codehaus.groovy.tools.RootLoader.findClass(RootLoader.java:156) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at org.codehaus.groovy.tools.RootLoader.loadClass(RootLoader.java:128) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) ... 15 more

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• ASP.NET Web Service Throws 401 (unauthorized) Error

  - by user268611

  Hi Experts, I have this .NET application to be run in an intranet environment. It is configured so that it requires Windows Authentication before you can access the website (Anonymous access is disabled). This website calls a web service (enable anonymous access) and the web service calls the DB. We do have a token-based authentication between the web application and the web service to secure the communication between them. The issue I'm facing is that when I deploy this to production, I'm having an intermittent issue whereby the communication between the web application and the web service failed. The 401 issue was thrown. This is actually working fine in our QA environment. Is this an issue with Active Directory? Or could it be an isssue with FQDN as mentioned here: http://support.microsoft.com/default.aspx?scid=kb;en-us;896861? The weirdest thing is that this is happening intermittently when tested in both on the server itself and a remote workstation in my client's environment. But, this is working perfectly in my environment. OS: Windows Server SP1 IIS 6 .NET 3.5 Framework Any idea about the 401 (Unauthorized) issue?? Thx for the help... This is from the log... Event code: 3005 Event message: An unhandled exception has occurred. Event time: 4/5/2010 10:44:57 AM Event time (UTC): 4/5/2010 2:44:57 AM Event ID: 6c8ea2607b8d4e29a7f0b1c392b1cb21 Event sequence: 155112 Event occurrence: 2 Event detail code: 0 Application information: Application domain: xxx Trust level: Full Application Virtual Path: xxx Application Path: xxx Machine name: xxx Process information: Process ID: 4424 Process name: w3wp.exe Account name: NT AUTHORITY\NETWORK SERVICE Exception information: Exception type: WebException Exception message: The request failed with HTTP status 401: Unauthorized. Request information: Request URL: http://[ip]/[app_path] Request path: xxx User host address: [ip] User: xxx Is authenticated: True Authentication Type: Negotiate Thread account name: xxx Thread information: Thread ID: 6 Thread account name: xxx Is impersonating: False Stack trace: at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall) at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) at wsVulnerabilityAdvisory.Service.test() at test.Page_Load(Object sender, EventArgs e) at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

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