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• javac compiler throwing error in CentOS 5.7

  - by Julio Menendez

  I'm trying to install Red5 on a vps running CentOS 5.7 in MediaTemple using this how-to (dv):Install Red5 Media Server but on step 7 I get this error: BUILD FAILED /usr/local/red5/build.xml:217: The following error occurred while executing this line: /usr/local/red5/build.xml:238: Error running /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/bin/javac compiler Any idea how to fix it? Already Google and several users have had this same issue but none posted the solution or they never solved. UPDATE: Some more details: running ant -v dist shows that is a memory problem: Caused by: java.io.IOException: Cannot run program "/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/bin/javac": java.io.IOException: error=12, Cannot allocate memory at java.lang.ProcessBuilder.start(ProcessBuilder.java:475) at java.lang.Runtime.exec(Runtime.java:610) at org.apache.tools.ant.taskdefs.Execute$Java13CommandLauncher.exec(Execute.java:862) at org.apache.tools.ant.taskdefs.Execute.launch(Execute.java:481) at org.apache.tools.ant.taskdefs.Execute.execute(Execute.java:495) at org.apache.tools.ant.taskdefs.compilers.DefaultCompilerAdapter.executeExternalCompile(DefaultCompilerAdapter.java:522) ... 32 more Caused by: java.io.IOException: java.io.IOException: error=12, Cannot allocate memory at java.lang.UNIXProcess.<init>(UNIXProcess.java:164) at java.lang.ProcessImpl.start(ProcessImpl.java:81) at java.lang.ProcessBuilder.start(ProcessBuilder.java:468) ... 37 more and I defined _JAVA_OPTIONS="-Xms64m -Xmx128m" and export ANT_OPTIONS=-Xmx128m and I tried with Xmx512m in both cases, no luck. Thanks!

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• Java code critique request [closed]

  - by davidk01

  Can you make sense of the following bit of java code and do you have any suggestions for improving it? Instead of writing four almost identical setOnClickListener method calls I opted to iterate over an array but I'm wondering if this was the best way to do it. Here's the code: /* Set up the radio button click listeners so two categories are not selected at the same time. When one of them is clicked it clears the others. */ final RadioButton[] buttons = {radio_books,radio_games,radio_dvds,radio_electronics}; for (int i = 0; i < 4; i++) { final int k = i; buttons[i].setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { for (int j = 0; j < 4; j++) { if (buttons[j] != buttons[k]) { buttons[j].setChecked(false); } } } }); }

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• Objective C style nil in java?

  - by Usman Ismail

  Objective C has a concept of a nil object which would accept any method call with any parameters without complaining and silently return another nil. I have used something similar in Java using easymock and mockito for testing. Is there something similar for main line code? Is it even a good idea to have something like this? One use-case where I am considering using it is with optional metrics. We have codahale metrics counters on which we call mark() every time an event is generated. This is surrounded by an If/then to check for metrics enabled flag. I could just use a nil object as counter and silently accept the mark call if metrics are not enabled.

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• Java performance of StringBuilder append chains

  - by ultimate_guy

  In Java, if I am building a significant number of strings, is there any difference in performance in the following two examples? StringBuilder sb = new StringBuilder(); for (int i = 0; i < largeNumber; i++) { sb.append(var[i]); sb.append('='); sb.append(value[i]); sb.append(','); } or StringBuilder sb = new StringBuilder(); for (int i = 0; i < largeNumber; i++) { sb.append(var[i]).append('=').append(value[i]).append(','); } Thanks!

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• JavaOne 2012 - The Power of Java 7 NIO.2

  - by Sharon Zakhour

  At JavaOne 2012, Mohamed Taman of e-finance gave a presentation highlighting the power of NIO.2, the file I/O APIs introduced in JDK 7. He shared information on how to get the most out of NIO.2, gave tips on migrating your I/O code to NIO.2, and presented case studies. The File I/O (featuring NIO.2) lesson in the Java Tutorials has extensive coverage of NIO.2 and includes the following topics: Managing Metadata Walking the File Tree Finding Files, including information on using PatternMatcher and globs. Watching a Directory for Changes Legacy File I/O Code includes information on migrating your code. From the conference session page, you can watch the presentation or download the materials.

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• Which simple Java JPA ORM tool to use ?

  - by Guillaume

  What Java ORM library implementing JPA that match following criteria would you recommend and why ? free & open source alive (at least bug fixes and a mailing list) with good documentation simple not hibernate (this one is well-known :-) ) I need to select a simple ORM tool that can be set up in minutes without and easy to understand for setting simple CRUD daos. A query builder ill be an interesting plus. Later I can have to move to Hibernate, that's why being JPA compliant is a must. I have found some candidates on the web, but not so much feedback, so I will gladly take your advices on the topic. ----- EDIT --------- I have been successfully testing ebean/avaje with a small test cases. Any one has a feedback on using this tool in production ?

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• Questions about an Engine Java

  - by CJ Sculti

  so I am going to start developing Java games (3D) but I have a few questions. So I dont know if I should use an engine or make my own. I feel like I am "cheating" if I use an engine to make my game. Is it frowned upon in the game developing world? What are some advantages and disadvantages to using an engine for my game and is it really that much harder to make my own engine? I know that engines have built in models and textures with easy drag and drop interfaces, would I have any of that if I were to code my own engine? Thanks guys.

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• Index out of bounds, Java bukkit plugin

  - by Robby Duke

  I'm getting index out of bounds errors in my Bukkit plugin, and it's really beginning to piss me off... I for the life of me can't figure this issue out! Caused by: java.lang.IndexOutOfBoundsException: Index: 1, Size: 1 This is where I believe the code to be erroring... for(int i = 0; i <= staffOnline.size(); i++) { if(i == staffOnline.size()) { staffList = staffList + staffOnline.get(i); } else { staffList = staffList + staffOnline.get(i) + ", "; } }

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• Random Map Generation in Java

  - by Thomas Owers

  I'm starting/started a 2D tilemap RPG game in Java and I want to implement random map generation. I have a list of different tiles, (dirt/sand/stone/grass/gravel etc) along with water tiles and path tiles, the problem I have is that I have no idea where to start on generating a map randomly. It would need to have terrain sections (Like a part of it will be sand, part dirt etc) Similar to how Minecraft is where you have different biomes and they seamlessly transform into each other. Lastly I would also need to add random paths into this as well going in different directions all over the map. I'm not asking anyone to write me all the code or anything, just piont me into the right direction please. tl;dr - Generate a tile map with biomes, paths and make sure the biomes seamlessly go into each other. Any help would be much appreciated! :) Thank you.

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• Collision Detection in Java for a game

  - by gordsmash

  Im making a game in Java with a few other people but we are stuck on one part of it, making the collision detection. The game is an RPG and I know how to do the collision detection with the characters using Rectangles, but what I dont know how to do is the collision detection for the maps. What I mean by that is like so the character cant walk over trees or water and that stuff but using rectangles doesnt seem like the best option here. Well to explain what the game maps are gonna look like, here is an example http://i980.photobucket.com/albums/ae287/gordsmash/7-8.jpg Now I could use rectangles to get bounds and stop the player from walking over the trees and water but that would take a lot of them. But is there another easier way to prevent the player from walking over the trees and obstacles besides using Rectangles?

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• Opensource showcase for MVC in Java Swing

  - by Regular John

  I've allready created small desktop CRUD applications using Java/Swing. In hindsight I'm not quite sure if the overall design of these applications is good. I've also done some reading on MVC and looked at different Swing-tutorials. My problem is, that I've got a very theroatical knowledge of MVC and on the other hand, most Swing-resources don't implement the MVC-pattern. Now I would like to get my hands dirty and see how MVC is implemented in Swing in a real-world-application. Are there any opensource project you could recommend? It would be also interesting to have more than one project, to see different approaches. Best fit would be a software, that uses a relational database in the backend, to see an overall design, that I can compare to my former applications.

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• Error trying to install the Java SDK

  - by Ray

  I need to install the Java 6 SDK, but after running this: sudo apt-get install sun-java6-jdk sun-java6-jre sun-java6-source I end up with this: Reading package lists... Done Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: sun-java6-jdk : Depends: sun-java6-bin (>= 6.26-1lucid1) but it is not going to be installed sun-java6-jre : Depends: sun-java6-bin (>= 6.26-1lucid1) but it is not going to be installed or ia32-sun-java6-bin (>= 6.26-1lucid1) but it is not installable Recommends: gsfonts-x11 but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). I'm quite new to Ubuntu and need the packages for my course. I guess they've become corrupted but, how can I fix this?

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• Playing repeated sound in Java

  - by Diogo Schneider

  I'm trying to play sounds in a Java game with the following code: AudioStream audioStream = new AudioStream(stream); AudioPlayer.player.start(audioStream); The stream variable is just an InputStream to the resource. By the first time this code is called, the sound is played as expected, but by the second time the program just hangs, not even an exception is thrown. I don't know what's going on or how to prevent this. If I try closing either stream or audioStream after the above code, the program doesn't hang, but no sound is ever played at all. Any tips are welcome, thanks.

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• How to Get Myself Up to Speed in Building a Java Web App

  - by Damian Wells

  I'm a new developer at a fairly large company and I'm working on a Java Web Application with a senior developer there. The Web App is built on top of an IBM stack (RAD, DB2, WebSphere) and basically uses JSPs and Servlets. The Web App is an internal tool to be used by employees to manage data coming from Excel files. So, there are lots of database interaction going around like SQL commands. My question is: I don't know much about JavaEE as a whole and only know a little about JSPs and Servlets and I would like to get myself up to speed so I can understand and contribute to the Web App as fast as I could. What resources (tutorials, links, etc) should I be looking at? Am I supposed to get a book about JavaEE or something that focuses just on JSPs and Servlets?

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• Translating an Object to a certain Vector 3 in OpenGL and Java LWJGL

  - by aliasmk

  So after almost two hours, I got the hang of using glTranslated() (with Java and LWJGL). If I am correct, applying glTranslated on an object moves that object with the x,y,z relative to the previously moved object. I believe the correct term for this is local vs global, global being the one I want. I was wondering if there was a way to translate an object to a specific XYZ position, or relative to the origin. Thanks! (Code or other details can be supplied if it helps, just let me know. Also sorry if this is a noob comment, Im very new to OpenGL.)

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• PDF or ebook Java API documentation

  - by AmaDaden

  Since I have a long train ride to and from work I was wondering if there is a version of the Java API documentation floating around that I could put on my Kindle. It would be nice on the rare occasion I get something in my head that I want to think about some more. I know I can browse the web through the Kindle but coverage is spotty and slow. I know that the api docs are not really designed for a sequential reading format but I'm curious to see if anyone else has thought about this and given it a shot.

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• Which simple Java JPA ORM tool to use ?

  - by Guillaume

  What Java ORM library implementing JPA that match following criteria would you recommend and why ? free & open source alive (at least bug fixes and a mailing list) with good documentation simple (simpler than hibernate) I need to select a simple ORM tool that can be set up in minutes, without too much configuration and easy to understand, for setting simple CRUD DAOs. A query builder will be an interesting plus. Later I can have to move to Hibernate, that's why being JPA compliant is a must. I have found some candidates on the web, but not so much feedback, so I will gladly take your advices on the topic. ----- EDIT --------- I have been successfully testing ebean/avaje with a small test cases. Any one has a feedback on using these tools in production ?

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• Building a website, want to use java

  - by Robb

  I'd like to make a simple-ish website that is essentially a small game. Key strokes are to be processed and sent to a server (already acquired and should support SQL and JSP, I believe) which then translate to a location and written to the DB. SQL queries are to be used to retrieve these locations and written to other clients connected to the website. Their page is to be updated with these locations. I have working knowledge of Java, jQuery/Ajax, SQL and JavaScript but I'm unfamiliar with JSP and how everything hooks up. I'm aware of the MVC paradigm as well. For my little game idea, would these technologies work? Am I over thinking this and can make it much easier to implement? What might be a good tutorial or example to study?

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• How to maximize Java resources for gaming?

  - by Keidax

  I notice that when I play Minecraft, my CPU usage is only around 15 to 20 percent, at most. Is it possible to force my computer to allocate as much RAM, CPU time, etc. to the game, in order to get the best experience possible? Or, is the low CPU usage due to limitations in the JVM or the game code itself? I have OptiFine installed, and I've already tried using renice to change the process priority and -Xmx to allocate more memory to Java. What else can I do?

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• Java web UI framework like ASP.NET MVC?

  - by Ethel Evans

  I'm doing some web apps for personal projects that might be shared out with my friends. I'm trying to use skills that will help me at work, but don't have $$ to spend on Visual Studio right now and don't want to try to cobble something together with Express Editions. Since I've been sort of wanting to bring my Java skills up to date and the main skills I want to work on are design and architecture skills, this isn't a big deal - except that I have no idea how to track down the right UI framework. I know I want something based on MVC, to get more practice with frameworks for that design pattern (we're using ASP .NET MVC2 at work). The UIs that I'll be making will be pretty simple - data entry, buttons, text, images. They will need AJAX. Any thoughts about which frameworks to look at? I'll be watching the comments, if anyone wants additional clarification on what I'm looking for.

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• dead keys not working in java app

  - by jippie

  The Arduino IDE is based on a java application called processing. While typing text into processing, it refuses to accept any of the characters under dead keys like " ' ^. As a work around I: Open another window (usually my browser or mail client); I type the character I need; Select and copy the character onto my clip board; Copy the character into processing. What do I have to do to make processing accept characters under dead keys? Disabling dead keys is not an option.

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• Help me understand a part of Java Language Specification

  - by Software Engeneering Learner

  I'm reading part 17.2.1 of Java language specification: http://docs.oracle.com/javase/specs/jls/se7/html/jls-17.html#jls-17.2.1 I won't copy a text, it's too long, but I would like to know, why for third step of sequence they're saying that If thread t was removed from m's wait set in step 2 due to an interrupt Thread couldn't get to step 2 it wasn't removed from wait set, because it written for the step 1: Thread t does not execute any further instructions until it has been removed from m's wait set Thus thread can't be removed from wait set in step 2 whatever it's due to, because it was already removed. Please help me understand this.

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• Virtual Developer Day: Oracle WebLogic Server & Java EE (#OTNVDD)

  - by Justin Kestelyn

  Virtual Developer Day is back with a vengeance! On Feb. 1, login to learn how Oracle WebLogic Server enables a whole new level of productivity for enterprise developers. Also hear the latest on Java EE 6 and the programming tenets that have made it a true platform breakthrough, and get hands-on with our VirtualBox virtual machine image! Even better, you never have to leave your desk - you'll get access to live sessions with chat support, and even 1-1 desktop sharing upon request. It's a no-brainer, get registered!

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• Java and web pages

  - by Filippo

  Hello everyone and thank you in advance for the answers. I have a question concerning not how to do something, but with which instruments. Let's say, I want to write a simple application in Java that connects to a news website (e.g. CNN), parses the html document and prints on screen the news. Another example : my application retrieves and prints on screen soccer results from Eurosports. What do I need to do that? External libraries? Or maybe what I'm looking for is already included in JavaEE? Could this be helpful? http://jsoup.org/<< Thank you everyone again and have a nice day.

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• java framework for a web wizard

  - by snippl

  I'd like to create a web wizard or a wizard on/within a website. I know there are several java frameworks for wizards but there is none for the web in particular. If I search for a framework, I always get wizards to create a website, applet, servlet and what not. But never how to create such a wizard itself. So the question(s) is: What framework should I use to create a web wizard? And what frameworks are there? The wizard will be the visualisation for a BPEL Process deployment on a apache ode. I thought a webapp would be an easy way because the apache is running anyway. I'm not bound to that, perhaps someone has a better idea.

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