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  • [WebLogic, Java] WebLogic Developer/Production Web Profile, Full Java EE 6 Platform - Chat Transcript and Slides from OTN Virtual Developer Day

    - by yosuke.arai(at)oracle.com
    ????????????????????????WebLogic Server Virtual Developer Days??JavaEE6???????QA???????????????????(FireFox???????????????????????????????????????) ?????????????????????????????! > Q1) WLS10.3.4??JavaEE6????????????? > Q4) Java EE6 ???????IDE????????? > Q12) Jdeveloper?Java EE 6?????????????? > Q26) managed beans?EJB????????????????EJB??????????????????????managed beans?????????????????????Managed Beans?????????? > Q29) XML???????????????????????????????

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  • When attaching AI to a vehicle should I define all steps or try Line of Sight?

    - by ThorDivDev
    This problem is related to an intersection simulation I am building for university. I will try to make it as general as possible. I am trying to assign AI to a vehicle using the JMonkeyEngine platform. AIGama_JmonkeyEngine explains that if you wish to create a car that follows a path you can define the path in steps. If there was no physics attached whatsoever then all you need to do is define the x,y,z values of where you want the object to appear in all subsequent steps. I am attaching the vehicleControl that implements jBullet. In this case the author mentions that I would need to define the steering and accelerating behaviors at each step. I was trying to use ghost controls that represented waypoints and when on colliding the car would decide what to do next like stopping at a red light. This didn't work so well. Car doesn't face right. public void update(float tpf) { Vector3f currentPos = aiVehicle.getPhysicsLocation(); Vector3f baseforwardVector = currentPos.clone(); Vector3f forwardVector; Vector3f subsVector; if (currentState == ObjectState.Running) { aiVehicle.accelerate(-800); } else if (currentState == ObjectState.Seeking) { baseforwardVector = baseforwardVector.normalize(); forwardVector = aiVehicle.getForwardVector(baseforwardVector); subsVector = pointToSeek.subtract(currentPos.clone()); System.out.printf("baseforwardVector: %f, %f, %f\n", baseforwardVector.x, baseforwardVector.y, baseforwardVector.z); System.out.printf("subsVector: %f, %f, %f\n", subsVector.x, subsVector.y, subsVector.z); System.out.printf("ForwardVector: %f, %f, %f\n", forwardVector.x, forwardVector.y, forwardVector.z); if (pointToSeek != null && pointToSeek.x + 3 >= currentPos.x && pointToSeek.x - 3 <= currentPos.x) { aiVehicle.steer(0.0f); aiVehicle.accelerate(-40); } else if (pointToSeek != null && pointToSeek.x > currentPos.x) { aiVehicle.steer(-0.5f); aiVehicle.accelerate(-40); } else if (pointToSeek != null && pointToSeek.x < currentPos.x) { aiVehicle.steer(0.5f); aiVehicle.accelerate(-40); } } else if (currentState == ObjectState.Stopped) { aiVehicle.accelerate(0); aiVehicle.brake(40); } }

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  • 16-bit PNGs in Slick2D

    - by Neglected
    I'm working on a project and I'm using some 3rd party sprites just to get it off the ground; recently I've come into a hitch. Slick2D doesn't seem to want to load my images. That is, it will warn me that images are the wrong bit-depth. All the images are in 16-bit PNG form (PNG is required for transparency). Is there any way I can disable the warning (being the bad guy programmer (the console print for each individual load REALLY SLOWS DOWN the image)) or is there another solution? I was thinking about converting all images (using imagemagick) to .gif (with an alpha channel). Would there be any loss in quality between formats? EDIT: I tried using imagemagick but some of the sprites use pure black so I can't do that without wrecking the image. EDIT2: using "identify" on any of the images show them as being 8-bit.. but Slick2D won't load them. What the hell? D: EDIT3: Issue solved (ish). If you are googling this then just disable the java png loader from slick by sticking this somewhere in your code (like the main method): System.setProperty("org.newdawn.slick.pngloader", "false");

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  • Multiple vulnerabilities fixed in Java 7U9

    - by RitwikGhoshal
    CVE DescriptionCVSSv2 Base ScoreComponentProduct and Resolution CVE-2012-5086 10.0 Java 7 Solaris 11.1 10/12 SRU 2.5 CVE-2012-5083 10.0 CVE-2012-5087 10.0 CVE-2012-1533 10.0 CVE-2012-1532 10.0 CVE-2012-1531 10.0 CVE-2012-5076 10.0 CVE-2012-3143 10.0 CVE-2012-5088 10.0 CVE-2012-5089 7.6 CVE-2012-5084 7.6 CVE-2012-3159 7.5 CVE-2012-5068 7.5 CVE-2012-4416 6.4 CVE-2012-5074 6.4 CVE-2012-5071 6.4 CVE-2012-5069 5.8 CVE-2012-5067 5.0 CVE-2012-5070 5.0 CVE-2012-5075 5.0 CVE-2012-5073 5.0 CVE-2012-5079 5.0 CVE-2012-5072 5.0 CVE-2012-5081 5.0 CVE-2012-3216 2.6 CVE-2012-5077 2.6 CVE-2012-5085 0.0 This notification describes vulnerabilities fixed in third-party components that are included in Oracle's product distributions. Information about each CVE can be found on Java SE Critical Patch Update - October 2012 Information about vulnerabilities affecting Oracle products can be found on Oracle Critical Patch Updates and Security Alerts page.

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  • Sprite batching in OpenGL

    - by Roy T.
    I've got a JAVA based game with an OpenGL rendering front that is drawing a large amount of sprites every frame (during testing it peaked at 700). Now this game is completely unoptimized. There is no spatial partitioning (so a sprite is drawn even if it isn't on screen) and every sprite is drawn separately like this: graphics.glPushMatrix(); { graphics.glTranslated(x, y, 0.0); graphics.glRotated(degrees, 0, 0, 1); graphics.glBegin(GL2.GL_QUADS); graphics.glTexCoord2f (1.0f, 0.0f); graphics.glVertex2d(half_size , half_size); // upper right // same for upper left, lower left, lower right graphics.glEnd(); } graphics.glPopMatrix(); Currently the game is running at +-25FPS and is CPU bound. I would like to improve performance by adding spatial partitioning (which I know how to do) and sprite batching. Not drawing sprites that aren't on screen will help a lot, however since players can zoom out it won't help enough, hence the need for batching. However sprite batching in OpenGL is a bit of mystery to me. I usually work with XNA where a few classes to do this are built in. But in OpenGL I don't know what to do. As for further optimization, the game I'm working on as a few interesting characteristics. A lot of sprites have the same texture and all the sprites are square. Maybe these characteristics will help determine an efficient batching technique?

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  • Ad-hoc reporting similar to Microstrategy/Pentaho - is OLAP really the only choice (is OLAP even sufficient)?

    - by TheBeefMightBeTough
    So I'm getting ready to develop an API in Java that will provide all dimensions, metrics, hierarchies, etc to a user such that they can pick and choose what they want (say, e.g., dimensions of Location (a store) and Weekly, and the metric Product Sales $), provide their choices to the api, and have it spit out an object that contains the answer to their question (the object would probably be a set of cells). I don't even believe there will be much drill up/down. The data warehouse the APIwill interface with is in a standard form (FACT tables, dimensions, star schema format). My question is, is an OLAP framework such as Mondrian the only way to achieve something akin to ad-hoc reporting? I can envisage a really large Cube (or VirtualCube) that contains most of the dimensions and metrics the user could ever want, which would give the illusion of ad-hoc reporting. The problem is that there is a ton of setup to do (so much XML) to get the framework to work with the data. Further it requires specific knowledge, such as MDX, and even moreso learning the framework peculiars (Mondrian API). Finally, I am not positive it will scale much better than simply making queries against a SQL database. OLAP to me feels like very old technology. Is performance really an issue anymore? The alternative I can think of would be dynamic SQL. If the existing tables in the data warehouse conform to a naming scheme (FACT_, DIM_, etc), or if a very simple config file/ database table containing config information existed that stored which tables are fact tables, which are dimensions, and what metrics are available, then couldn't the api read from that and assembly the appropriate sql query? Would this necessarily be harder than learning MDX, Mondrian (or another OLAP framework), and creating all the cubes? In general, I feel that OLAP is at the same time too powerful (supports drill up/down, complex functions) and outdated and am reluctant to base my architecture on it. However, I am unsure if the alternative(s), such as rolling my own ad-hoc reporting framework using dynamic SQL would remove any complexity while still fulfilling requirements, both functional and non-functional (e.g., scalability; some FACT tables have many millions of rows). I also wonder about other techniques (e.g., hive). Has anyone here tried to do ad-hoc reporting? Any advice? I expect this project to take a pretty long time (3 months min, but probably longer), so I just do not want to commit to an architecture without being absolutely sure of its pros and cons. Thanks so much.

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  • How to load chunks of 2d map segments when player reaches a certain point?

    - by 2kan
    In my 2d platformer (made with Java and Slick2d), random maps are made by combining different segments together and displaying them one after the other. My problem is that I can't load too many segments or the game will run out of memory, so I want to load n number of segments at a time in chunks, then load the next chunk when the player comes near the end of one. I've attempted to do this for a couple of hours now, but I just can't get it to work at all. This is my chunk generation function where chunkLoad is the number of segments to load and BLOCK_WIDTH is the number of blocks/tiles each segment is across. Chunk1 and map are arrays of segments. Random r = new Random(); for(int i=0; i<chunkLoad; i++) { int id = r.nextInt(4)+2; chunk1[i] = new BlockMap("res/window/map"+id+".tmx", i*BLOCK_WIDTH); } map = chunk1; chunksLoaded++; The map is then drawn on the screen like this. tmap is a TiledMap object and each block/tile is 16 pixels wide for(int i=0; i<chunkLoad; i++) { map[i].tmap.render((i * BLOCK_WIDTH * 16) + (cameraX), 0); } I can successfully load new chunks, but I can't display them in the correct position, nor the hitboxes. Any suggestions? Thanks.

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  • New Java ME JSRs submitted

    - by heathervc
    Two new Java ME related JSRs were submitted to the JCP program office this week and are now available for review. JSR 360, Connected Limited Device Configuration (CLDC) 8, has been submitted by Oracle for JSR Review.  This review period is open until 15 October.  The ME EC will vote on the JSR Approval Ballot 16-29 October. JSR 361 Java ME Embedded Profile, has been submitted by Oracle for JSR Review. This review period is open until 15 October.  The ME EC will vote on the JSR Approval Ballot 16-29 October.

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  • Error Setting Java Environment Variables

    - by Cherie Riesberg
    Problem:  Not exactly SharePoint, but the issue is when setting the %JAVA_HOME% environment variable, Java installs to the Program Files directory by default.  The space in the path seems to stop the variable from being read.  You get an error. Solution:  Change Program Files to Progra~1, so the path now looks like this: C:\Progra~1\Java\jdk1.6.0_23\bin\; You can type %JAVA_HOME%\bin\javac to test.  Output should look like this: Usage: javac <options> <source files> where possible options include: ...

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  • Implementing Explosions

    - by Xkynar
    I want to add explosions to my 2D game, but im having a hard time with the architecture. Several game elements might be responsible for explosions, like, lets say, explosive barrels and bullets (and there might be chain reactions with close barrels). The only options i can come up with are: 1 - Having an array of explosions and treat them as a game element as important as any other Pros: Having a single array which is updated and drawn with all the other game element arrays makes it more organized and simple to update, and the explosive barrels at a first glance would be easy to create, simply by passing the explosion array as a pointer to each explosive barrel constructor Cons: It might be hard for the bullets to add an explosion to the vector, since bullets are shot by a Weapon class which is located in every mob, so lets say, if i create a new enemy and add it to the enemy array, that enemy will have a weapon and functions to be able to use it, and if i want the weapon (rocket launcher in this case) to have access to the explosions array to be able to add a new one, id have to pass the explosion array as a pointer to the enemy, which would then pass it to the weapon, which would pass it to the bullets (ugly chain). Another problem I can think of is a little more weird: If im checking the collisions between explosions and barrels (so i create a chain reaction) and i detect an explosion colliding with a barrel, if i add a new explosion while im iterating the explosions java will trow an exception. So this is kinda annoying, i cant iterate through the explosions and add a new explosion, i must do it in another way... The other way which isnt really well thought yet is to just add an explosive component to every element that might explode so that when it dies, it explodes or something, but i dont have good ways on implementing this theory either Honestly i dont like either the solutions so id like to know how is it usually done by actual game developers, sorry if my problem seems trivial and dumb.

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  • VDC Research Webcast: Engineering Business Value in the IoT with Java 8

    - by tangelucci
    Date: Thursday, June 19, 2014 Time: 9:30 AM PDT, 12:30 PM EDT, 17:30 GMT The growth of the Internet of Things (IoT) opens up new service-driven opportunities, delivering increased efficiencies, better customer value, and improved quality of life. Realizing the full potential of the Internet of Things requires that we change how we view and build devices. These next-generation systems provide the core foundation of the services, rapidly transforming data to information to value. From healthcare to building control systems to vehicle telematic systems, the IoT focuses on how conneted devices can become more intelligent, enhance interoperability with other devices, systems and services, and drive timely decisions while delivering real business return for all. Join this webcast to learn about: Driving both revenue opportunities and operational efficiencies for the IoT value chain Leveraging Java to make devices more secure How Java can help overcome resource gaps around intelligent connected devices Suggestions on how to better manage fragmentation in embedded devices Register here: http://event.on24.com/r.htm?e=793757&s=1&k=4EA8426D0D31C60A2EDB139635FF75AB

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  • How to handle notifications to several partial views of the same model?

    - by Seki
    I am working on refactoring an old simulation of a Turing machine. The application uses a class that contains the state and the logic of program execution, and several panels to display the tape representation and show the state, messages, and the GUI controls (start, stop, program listing, ...). I would like to refactor it using the MVC architecture that was not used originaly: the Frame is the only way to get access to the different panels and there is also a strong coupling between the "engine" class and the GUI updates in the way of frame.displayPanel.state.setText("halted"); or frame.outputPanel.messages.append("some thing"); It looks to me that I should put the state related code into an observable model class and make the different panels observers. My problem is that the java Observable class only provides a global notification to the Observers, while I would prefer not to refresh every Observers everytime, but only when the part that specificaly observe has changed. I am thinking of implementing myself several vectors of listeners (for the state / position, for the output messages, ...) but I feel like reinventing the wheel. I though also about adding some flags that the observers could check like isNewMessageAvailable(), hasTapeMoved(), etc but it sounds also approximative design. BTW, is it ok to keep the fetch / execute loop into the model or should I move it in another place? We can think in a theorical ideal way as I am completely revamping this small application.

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  • Dynamic object creation with HashMap

    - by Salor
    I want to use a HashMap to dynamically create objects based on the key. I have a Random Map Generator that stores the maps in 3D Arrays of Type Integer[][][]. Upon creation of the actual map I iterate through this array and based on the Integer I want to create the right block. Example: Integer[][][] map ... map[6][6][6] = 3; 3 is a Earth-Block and now I want to initialize a new Block of this type and give it the right coordinates. Currently I store my Bindings from Integer to Class in a HashMap(Integer, String) and create my objects like that: int id = array[x][y][z]; String block_name = Blocks.map.get(id); Block block = (Block) Class.forName(block_name).newInstance(); block.setPosition(x,y,z); But I want to avoid newInstance() if possible. I've never worked that dynamically with Java before and I couldn't find a solution like changing the HashMap to (Integer, Class) or something. I just need to create a new Object based upon the Integer. Any ideas/solutions? Thanks in advance and have a wonderful day!

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  • Multiple vulnerabilities fixed in Java 6U37

    - by RitwikGhoshal
    CVE DescriptionCVSSv2 Base ScoreComponentProduct and Resolution CVE-2012-5083 10.0 Java 6 Solaris 11.1 10/12 SRU 2.5 CVE-2012-1531 10.0 CVE-2012-5086 10.0 CVE-2012-1533 10.0 CVE-2012-1532 10.0 CVE-2012-3143 10.0 CVE-2012-5089 7.6 CVE-2012-5084 7.6 CVE-2012-3159 7.5 CVE-2012-5068 7.5 CVE-2012-4416 6.4 CVE-2012-5071 6.4 CVE-2012-5069 5.8 CVE-2012-5075 5.0 CVE-2012-5073 5.0 CVE-2012-5079 5.0 CVE-2012-5072 5.0 CVE-2012-5081 5.0 CVE-2012-3216 2.6 CVE-2012-5077 2.6 CVE-2012-5085 0.0 This notification describes vulnerabilities fixed in third-party components that are included in Oracle's product distributions. Information about each CVE can be found on Java SE Critical Patch Update - October 2012 Information about vulnerabilities affecting Oracle products can be found on Oracle Critical Patch Updates and Security Alerts page.

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  • Arguments? Path filing wrong? [on hold]

    - by user3034947
    I'm working through the Java SE 7 programming activity and I'm having trouble sort of understanding how arguments work. Here's the code: public class CopyFileTree implements FileVisitor<Path> { private Path source; private Path target; public CopyFileTree(Path source, Path target) { this.source = source; this.target = target; } @Override public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) { // Your code goes here Path newdir = target.resolve(source.relativize(dir)); try { Files.copy(dir, newdir); } catch (FileAlreadyExistsException x) { // ignore } catch (IOException x) { System.err.format("Unable to create: %s: %s%n", newdir, x); return SKIP_SUBTREE; } return CONTINUE; } @Override public FileVisitResult visitFile(Path file, BasicFileAttributes attrs ) { // Your code goes here Path newdir = target.resolve(source.relativize(file)); try { Files.copy(file, newdir, REPLACE_EXISTING); } catch (IOException x) { System.err.format("Unable to copy: %s: %s%n", source, x); } return CONTINUE; } @Override public FileVisitResult postVisitDirectory(Path dir, IOException exc ) { return CONTINUE; } @Override public FileVisitResult visitFileFailed(Path file, IOException exc ) { if (exc instanceof FileSystemLoopException) { System.err.println("cycle detected: " + file); } else { System.err.format("Unable to copy: %s: %s%n", file, exc); } return CONTINUE; } } It says to test this I need to enter arguments in properties of the project which I did? Can someone clarity what I'm doing wrong?

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  • What is the most effective approach to learn an unfamiliar complex program? [closed]

    - by bdroc
    Possible Duplicate: How do you dive into large code bases? I have quite a bit of experience with different programming languages and writing small and functional programs for a variety of purposes. My coding skills aren't what I have a problem with. In fact, I've written a decent web application from scratch for my startup. However, I have trouble jumping into unfamiliar applications. What's the most effective way to approach learning a new program's structure and/or architecture so that I can start attacking the code effectively? Are there useful tools for their respective languages (Python and Java are my two primary languages)? Should I be starting with just looking at function names or documentation? How do you veterans approach this problem? I find this has to be with minimal help from coworkers or contributors who are already familiar with the application and have better things to do than help me. I'd love to practice this skill in an open source project so any suggestions for starting points (maybe mildly complex) would be great too!

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