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• Loading textures in an Android OpenGL ES App.

  - by Omega

  I was wondering if anyone could advise on a good pattern for loading textures in an Android Java & OpenGL ES app. My first concern is determining how many texture names to allocate and how I can efficiently go about doing this prior to rendering my vertices. My second concern is in loading the textures, I have to infer the texture to be loaded based on my game data. This means I'll be playing around with strings, which I understand is something I really shouldn't be doing in my GL thread. Overall I understand what's happening when loading textures, I just want to get the best lifecycle out of it. Are there any other things I should be considering?

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• Programming with midi, and tuning notes to specific frequencies

  - by froggie0106

  I am working on a project in which I need to be able to generate midi notes of varying frequencies with as much accuracy as possible. I originally tried to write my program in Java, but it turns out that the sound.midi package does not support changing the tunings of notes unless the frequencies are Equal Tempered frequencies (or at least it didn't in 1.4, and I haven't been able to find evidence that this has been fixed in recent versions). I have been trying to find a more appropriate language/library to accomplish this task, but since this is my first time programming with MIDI and my need for specific tuning functionality is essential, I have been having considerable trouble finding exactly what I need. I am looking for advice from people who have experience writing MIDI programs as to what languages are useful, especially for tuning notes to specific frequencies. Any links to websites with API docs and example code would also be extremely helpful.

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• Why should i use EJB?

  - by Nitesh Panchal

  Hello, As we all know that EJB's in 3.1 or 3.0 are simple POJOs. You just need to give annotations here and there and it gets converted to EJB from simple class. So, now my question is why should i use EJBs at all? Can i not do without them? In .Net i created class library and got things done. I never felt the need for anything like EJB. Simple classes were enough. Then, why in Java people stress on EJB? What is difference between a simple POJO and EJB in terms of execution and memory? Further which function should i write in EJB and which should i write in simple class? Should i dump every function in EJB only? or there is some kind of strategy? Does EJB provide anything special?

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• why my website display in FB Login window After Login through facebook?

  - by Vaibhav Bhalke

  Hi All I am Integrating Face book application with Our Website. My Website is in Java's [Google Web Toolkit] Framework 2.0.1 When we press FB-connect connect then FB's Login window comes, after that user enters email & pwd. When user clicks FB's connect button then Our website display in that Login window. Authentication and Connect Url is Proper http://localhost:8090/websitename/ How to solve this problem ? Where I did mistake ? Is there any solution? When I did same thing in GWT's development/Hosted mode with Authentication and Connect url http:/127.0.0.1:8888/ then works properly. Then why It create Probelm in localhost? :-/

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• Using Typeface.js within a GWT app

  - by dindeman

  I am looking for some sample Java code demonstrating how to get AJAX content displayed into a custom font using Typeface.js within a GWT app. I have tried a little bit by calling the following native function native void Typeface_renderDocument() /*-{ $wnd._typeface_js.renderDocument(); }-*/; after having filled the relevant widget with the AJAX content, and after calling the following function on the widget : void applyTypeface(Widget widget) { widget.addStyleName("typeface-js"); widget.getElement().getStyle().setProperty("fontFamily", "Helvetiker"); Typeface_renderDocument(); } ...where Helvetiker is a custom font (actually available from Typeface.js fonts page (http://typeface.neocracy.org/fonts.html). But that didn't work. I am looking forward to any suggestions since I am bit stuck here. Alternatively I would be interested in an example using cufón within GWT, although I am not so keen about the replacement by images that cufón does (which is the main reason why I was trying to use Typeface.js.)

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• Eclipse jvm.dll error when loading

  - by Dan James Palmer

  Trying to open Eclipse after a couple of months and get this error: So I checked that folder to see if it existed, and it did: I checked my PATH Was correct and it was also correct: When this error first occurred I had 3 Java installations. JRE 7 Update 10, JDK 7 Update 7 32bit and 64 bit. I uninstall ALL and restarted my machine. Eclipse then stated, as expected that I needed a JRE or a JDK. So I downloaded and installed the latest JDK and now I get this error, despite everything appearing to be correct. Any ideas?

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• performance monitoring tools for multi-tenant web application

  - by Anton

  We have a need to monitor performance of our java web app. We are looking for some tolls which can help us with this task. The major difficulty is that we are SaaS provider with multi-tenant server architecture with hundreds of customers running on the same hardware. So far we tried commercial products like DynaTrace and Coradinat but unfortunately they don't get the job done so far. What we need is a simple report which would tell us if we had performance problems on each customer site in a specified period of time. Mostly it will be response time per customer but also we will need some more specifics based on the URLs. please let me know if someone had any experience with setting up such monitoring. Thanks!

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• "Could not find the main class: bla.bla.yada", although specified correctly in the MANIFEST.MF

  - by Bernhard V

  Hi, I'm trying to run a .jar file with the command "java -jar Filename.jar", but I am always getting an error saying "Could not find the main class: bla.bla.yada". I build the whole application with Maven and specified a Main-Class in the MANIFEST.MF. The path in the file is correct and the class also exists at the right location in the jar. The ending .class is omitted in the MANIFEST.MF. I hope this is correct. Do you have any other hints?

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• Is eclipse's Garbage Collector different than the default?

  - by Savvas Dalkitsis

  From questions posted here and an old one of mine I have created the impression that you cannot explicitly run the Java Garbage Collector whenever you please. If you call it, you simply instruct the system to call it whenever it can or thinks is appropriate. But in eclipse, if you press the "Run Garbage Collector" button you see an immediate reduction in memory usage. How is that possible? Is eclipse using a different Garbage Collector, does it have access to some secret API that we don't or is my conception of how the GC works wrong?

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• Validating a Postscript without trying to print it?

  - by Epaga

  Saving data to Postscript in my app results in a Postscript file which I can view without issues in GhostView, but when I try to print it, the printer isn't able to print it because it seems to be invalid. Is there a way to validate / find errors in Postscript files without actually sending it to a printer? Preferred would be some kind of Java API/library, but a program which does the same would be fine as well. Edit #1 : no I don't know why it's invalid, nor even necessarily if it's invalid, but would like to be able to validate it outside of ghostview, or figure out what's going on when it can't print. Answer : Well using the ps2ps trick I was able to see the output that Postscript does and there check the difference. The difference was that I am not allowed to have a decimal number for the width or height of images in the Postscript, but rather only integers. So I still didn't find a way to validate, but this way was good enough for my problem. Thanks.

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• Lookahead regex produces unexpected group

  - by Ivan Yatskevich

  I'm trying to extract a page name and query string from a URL which should not contain .html Here is an example code in Java: public class TestRegex { public static void main(String[] args) { Pattern pattern = Pattern.compile("/test/(((?!\\.html).)+)\\?(.+)"); Matcher matcher = pattern.matcher("/test/page?param=value"); System.out.println(matcher.matches()); System.out.println(matcher.group(1)); System.out.println(matcher.group(2)); } } By running this code one can get the following output: true page e What's wrong with my regex so the second group contains the letter e instead of param=value?

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• Suggestions for a mashup application

  - by Raffo

  I have to write a mashup application for an university course and I have to use some APIs, but I need to choose by myself what to use and what the final application should do. Unfortunately I never made an application like this, so I'm not sure what to do... I don't want to code a stupid app which uses google maps' APIs since the web seems to be full of stuff like this. Have you got any suggestion for me? Is there any mashup web app you want that's still not there?? I can use JAVA, GWT (and google app engine of course) or python, but I also accept suggestions for other languages. Thank you in advance!

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• Apache Axis2 tried books

  - by josh

  I am looking to get my hands wet in Java Web Services. Apache CXF and Axis2 seem to be in demand a lot. I googled a bit for finding a good Axis2 book that has lot of working examples. some books like Quick Start Apache Axis 2 seem to have bad reviews on Amazon and titles like Web Services with Apache CXF and Axis2 seem to lack working examples. I want to get opinion from people who currently work with Axis2 and have read a book or two on the subject. Which is a good book for an Axis2 n00b.

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• Are frameworks using byte-code generation creating leaky abstractions?

  - by Gabriel Šcerbák

  My point is, if you don't understand the abstraction of a framework, you can still decompile it and understand it, because you know the language e.g. Java. However, when byte-code generation happens, you have to understand even a lower level - JVM level byte-codes. I am really affraid of using any of such frameworks, which are many. Most of the time I think the reason for byte-code generation is simply lack of language features such as metaprogramming. Do you agree? What is your opinion and argument? How do you take over the problem with leaky abstractions in those frameworks?

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• BlueJ Chpt 4 - Auction Project - How to make removeLot method work after entering a new lot

  - by Ellaine Ryan

  Hi All I am learning Java through BlueJ I would like to add a removeLot method to the Auction Class in BlueJ Chpt 4. This involves also returning the lot with the given number or null if there is no such lot. If you enter , say 5 lots and then use the remove method, this codes removes whichever lot you specify. However if you enter a new lot after using the removeLot method - an internal error message comes up regarding lotnumbering . Any ideas? Thanks Elaine public Lot removeLot(int number) { if((number >= 1) ) { } Lot lot = getLot (number); if(lot !=null) { lots.remove(lot); } return lot; }

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• Automatic VM deployment

  - by Robert Wilson

  I have an idea to streamline deployments of prototypes within our team using VMs. The idea would be that a developer would be able to deploy their artifacts to Maven, then use a Web interface to pull them onto a development VM for integration/regression testing. They would then be able to to push those artifacts to a reference system, and finally onto production. I'm currently thinking of doing this myself using the vSphere Java API ( http://vijava.sourceforge.net/ ), and some simple scripting to grab artifacts from the Maven repository, configuration from SVN, and then start up a JBoss server. It feels like the kind of thing that may already be available though, has anyone heard of something similar?

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• OOoBean with RCP

  - by Haythem

  Hi, I am trying to open OpenOffice documents on a View in RCP. I used for that the OleFram but he is not giving good results and now I am trying to integrate the OOoBean on my application but I can not see how I can do that. I am using Java 1.6 and Eclipse 3.5 and based on this sample http://www.eclipsezone.com/eclipse/forums/t48966.html My application have to show OOwriter and OOCalc documents and to be able to edit and save them. Is it possible to get this application working on a ViewPart? Thanks for the help.

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• How to find multiples of the same integer in an arraylist?

  - by Dan

  Hi My problem is as follows. I have an arraylist of integers. The arraylist contains 5 ints e.g[5,5,3,3,9] or perhaps [2,2,2,2,7]. Many of the arraylists have duplicate values and i'm unsure how to count how many of each of the values exist. The problem is how to find the duplicate values in the arraylist and count how many of that particular duplicate there are. In the first example [5,5,3,3,9] there are 2 5's and 2 3's. The second example of [2,2,2,2,7] would be only 4 2's. The resulting information i wish to find is if there are any duplicates how many of them there are and what specific integer has been duplicated. I'm not too sure how to do this in java. Any help would be much appreciated. Thanks.

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• DocuSign Connect xsd [on hold]

  - by Brian

  I'm trying to parse xml inbound to our system from the DocuSign Connect service (which publishes status updates to a given web service). I typiclly use jaxb to process xml but as far as I know I need xsd's in order to generate the jaxb. I don't have (or can't find) xsd's from DocuSign in order to do this. I could use other java classes/libraries to parse the xml but without xsd's I'd have to guess at types, restrictions and formats. Is there a way to generate jaxb without having xsd's?

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• Which build tool to teach?

  - by Helper Method

  While similiar questions have been asked, this one's focused on which is best/easiest to teach. I'm giving a weekly tutorial at my university focusing on data structures and algorithms. Fromn time to time I introduce tools which may prove helpful in future projects like JUnit, Mercurial, Eclipse etc.. I plan to show them some kind of build tool but I'm not sure which one to choose. I by myself have very little knowledge about build tools, except a little experience in using make. It's more the concept of a build tool I want to show them, not a special tool per se. Which would be the most easiest/future proof/whatever tool to show them? I've read a little bit about Gradle, which looks nice, but so far I think Ant could be a good choice (it's a Java course I'm giving).

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• Dynamic programming: Largest diamond(rhombus) block

  - by Darksody

  I have a small program to do in Java. I have a 2D array filled with 0 and 1, and I must find the largest rhombus (as in square rotated by 90 degrees) and their numbers. Example: 0 1 0 0 0 1 1 0 1 1 1 0 1 0 1 1 1 1 0 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 Result: 1 1 1 1 1 1 1 1 1 1 1 1 1 The problem is similar to this SO question. If you have any idea, post it here.

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• Pros and cons of sorting data in DB?

  - by Roman

  Let's assume I have a table with field of type VARCHAR. And I need to get data from that table sorted alphabetically by that field. What is the best way (for performance): add sort by field to the SQL-query or sort the data when it's already fetched? I'm using Java (with Hibernate), but I can't tell anything about DB engine. It could be any popular relational database (like MySQL or MS Sql Server or Oracle or HSQL DB or any other). The amount of records in table can vary greatly but let's assume there are 5k records.

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• Finding if a path between 2 sides of a game board exists

  - by Meny

  Hi, i'm currently working on a game as an assignment for school in java. the game cuurently is designed for Console. the game is for 2 players, one attacking from north to south, and the other from west to east. the purpose of the game is to build a "bridge"/"path" between the 2 of your sides before your opponent does. for example: A B C D E F 1 _ _ X _ _ _ 1 2 O X X _ _ _ 2 3 O X O O O O 3 4 O X O _ _ _ 4 5 X X _ _ _ _ 5 6 X O _ _ _ _ 6 A B C D E F player that attacks from north to south won (path/bridge from C to A) my problem is, what algorithm would be good to check if the user have managed to create a path (will be checked at the end of each turn). you're help would be very appreciated.

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• cant start glassfish within netbeans

  - by noname

  when i click on Run it displays and error message: Starting GlassFish v3 Domain GlassFish v3 Domain start failed. /Volumes/Private/noname/Sites/projects/java/MyFirstServlet/nbproject/build-impl.xml:602: Deployment error: GlassFish v3 Domain start failed. See the server log for details. BUILD FAILED (total time: 2 minutes 0 seconds) but then i fire up Terminal in mac and use asadmin start-domain and it starts. and in netbeans i then Run the project and it fires up Safari and displays the content. but why cant glassfish start in netbeans? any idea?

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• Arduino not able to send serial data back

  - by Casper Marcussen

  Hello everyone So i found out how to connect the arduino to my java program. But using the seriel connections dosent give any useful data back, its either in the wrong format, or just sends it as a box. I've looked at the related questions posted early in here, but none of the tips seems to help. So does anyone know how to send the data between an arduino and a computer using the serieal port? P.S I've used the sample code from the arduino.cc homepage to connect to the serial port.

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