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• Why isn't Java more widely used for game development?

  - by Anto

  I'm not a game developer or anything, but I know that Java is not very widely used for game development. Java should be fast enough for most games, so where's the catch? I can think of some reasons: Lack of game developers with expertice in Java Lack of good game development frameworks Programmers don't want to accept Java as a games programming language. Most only accept C++ as that? No support for game consoles (though the PC market still exists) It could of course be something else. Could someone who knows the business better than me explain why Java isn't getting momentum when it comes to game development?

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• Which version of Java should I use for learning?

  - by Dan

  I am a QA engineer interested in mobile development and automation.I have basic programming experience (intermediate level Python, C++ programmer) and as most companies choose Java for writing frameworks I need to pickup Java. I use Ubutnu 12.04 LTS and I will be using Head First Java as learning material. When I searched for JDK options I found Oracle Java 6 and 7 and Open JDK. I read somewhere in Ubuntu forums that Java 6 is not recommended on Ubuntu systems and I am a little bit confused about which version should I use, that would be compatible with the book and the OS.

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• How should I do 3D games through Java on a mac?

  - by Steven Rogers

  I have been self-teaching myself Java on the mac mostly because the language is cross-platform. Recently, I have been only able to develop 2D games using the Graphics2D class. Now, I want to learn how to make 3D games in Java. I used to model and animate stuff in 3D, so my knowledge of 3-Dimensional stuff is okay. I have spent the last 3 hours using google to look up ways of making 3D games in java. Apparently the best one to use is OpenGL, so i looked up a tutorial on it and i cannot find a tutorial that shows how to (if there is a way) install JOGL on the Mac platform. Should i continue to use Java? How can i make 3D games using Java? What is the best way to make 3D games on a mac?

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• Java dev learning Python: what concepts do I need to wrap my head around?

  - by LRE

  I've run through a few tutorials and written some small projects. I'm right in the middle of a small project now infact. All is going well enough thanks in no small part to Uncle Google (who usually points me to Stackoverflow ;-) Several times in the last few days I've found myself wondering "what am I missing?" - I feel that I'm still thinking in Java as I write in Python. This question over at StackOverflow is full of tips about what resources to read up on for learning Python, but I still feel that I'm a Java dev with a dictionary (pun unintended) to translate into Python. What I really want to do is refactor my head to be able to write Pythonic Python instead of Java disguised as Python (not that I want to loose my Java skills). So, the crux of my question is: what concepts does a Java dev really need to learn to think Pythonic? This includes anything that needs to be un-learnt. ps: I consider language syntax to not be particularly relevant to this question.

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• What's the best way to get up to speed with Java?

  - by Kosta

  I'm a software developer that just switched teams so I shall write code in Java now. Last time I wrote something in the language was in programming 101 at uni (I was already an amateur coder back then). So what is the best book/tutorial to get up to speed with Java? Where's the Java - the good parts? Learn you some Java for great good? Learn Java the hard way? Or is it too enterprisey for that kind of passion...?

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• Java dev learning Python: what concepts do I need to wrap my head around?

  - by LRE

  I've run through a few tutorials and written some small projects. I'm right in the middle of a small project now infact. All is going well enough thanks in no small part to Uncle Google (who usually points me to Stackoverflow ;-) Several times in the last few days I've found myself wondering "what am I missing?" - I feel that I'm still thinking in Java as I write in Python. This question over at StackOverflow is full of tips about what resources to read up on for learning Python, but I still feel that I'm a Java dev with a dictionary (no pun intended) to translate into Python. What I really want to do is refactor my head to be able to write Pythonic Python instead of Java disguised as Python (not that I want to loose my Java skills). So, the crux of my question is: what concepts does a Java dev really need to learn to think Pythonic? This includes anything that needs to be un-learnt. ps: I consider language syntax to not be particularly relevant to this question.

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• How to Reenable Apple Java 6 Plug-in for Mac EBS Users

  - by Steven Chan (Oracle Development)

  Apple's Java for OS X 2012-006 update uninstalled the Apple-provide Java applet plug-in from all Mac web browsers. Mac OS X users running Java-based applications are instructed to download the latest version of the Java 7 applet plug-in from Oracle. For more information about Oracle's Java 7 for Mac, see: Mac Java 7 FAQ: Install, Remove, Revert, Configure, Sys Req (Java.com) We're currently certifying Oracle E-Business Suite with Mac desktops running Java 7. We have identified some compatibility issues and are working with the Java team on fixes right now. Until that certification is completed, EBS users on Mac platforms can follow these instructions from Apple to ensure continued access to the E-Business Suite: Java for OS X 2012-006: How to re-enable the Apple-provided Java SE 6 applet plug-in and Web Start functionality (Apple.com) Related Articles Planning Bulletin for JRE 7: What EBS Customers Can Do Today

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• Why did the team at LMAX use Java and design the architecture to avoid GC at all cost?

  - by kadaj

  Why did the team at LMAX design the LMAX Disruptor in Java but all their design points to minimizing GC use? If one does not want to have GC run then why use a garbage collected language? Their optimizations, the level of hardware knowledge and the thought they put are just awesome but why Java? I'm not against Java or anything, but why a GC language? Why not use something like D or any other language without GC but allows efficient code? Is it that the team is most familiar with Java or does Java possess some unique advantage that I am not seeing? Say they develop it using D with manual memory management, what would be the difference? They would have to think low level (which they already are), but they can squeeze the best performance out of the system as it's native.

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• Oracle OpenWorld 2012?????WebLogic Server???3??????

  - by ???02

  ???????2012?9?30???10?4?(????)???4???????????????????????????Oracle OpenWorld 2012???????????????????????WebLogic Server????????????????????????????????????(Fusion Middleware?????????????????????????????)?????(???) ??????????????WebLogic Server?????? ??????Fusion Middleware??????????????????????????????????? ???????????OpenWorld??????WebLogic Server????????????????????????????(HTML5)???Oracle Database??????????3???????????????????????????? OpenWorld 2012?????????CEO????·??????????????·?????Oracle Cloud??????????SaaS?PaaS????IaaS???????????????? ??????????????????/?????????????????????????????????WebLogic Server????????????????????????????????????????·??????????????????????????????Oracle Exalogic Elastic Cloud?????????????????????????????????????????·???????????????????????? ???????????????·??????????·???????????????????????????????????????WebLogic Server?Oracle Enterprise Manager??????????????????????? ?????????????????????????????????·???????????????????????????????????????(???)????????????????????·???????????????????????????? ??????????·????????????????????????????????????????????????????????????????????Java EE????????????????????????·???????Oracle E-Business Suite????????????·???????????????????????????????????????????????????????????????????????? ??????????????????????????????????·????????????????????????????????????????????????????????????????????????????????????? ?WebLogic Server?Oracle Enterprise Manager?????????Exalogic?????????????????????????·????????????????????????????????????????????????????????????????????????????????????????????????????????OpenWorld?????????Exalogic???????????????????????/?????????????????????????????WebLogic Server?????????????????????????????????????(???) ?????????????????OpenWorld 2012???Java???????Oracle Developer Cloud Service???????????????·?????????????????????????·???????·??????????????????????????????·????·????????????????????????????Java??????????????????????????????????????????????????????????????????????????WebLogic Server????????????????? WebSockets?SSE???????Java EE???????? ????????Java??????????Java EE??????????????Java EE 7???????????????????????7???Java EE??????????????????·?????????????????????????????????????????????HTML5???????????????????????? ??????????Java EE??????????????WebLogic Server???????????12.1.2?????Java EE 7??????????Web???????????????????WebSockets???HTTP?????????????Server Sent Events(SSE)????????????????????????????OpenWorld 2012?????????WebSockets?SSE???????????????????????????Web???????????????????????????????????????????????????????????????? ???WebLogic Server?????????2013?????????????????Java EE 7??????????????????????Java?????????????????????????????????????WebLogic Server?????????????????????? ???WebLogic Server?????????????????Oracle TopLink DataService?????????????????????????????XML?JSON??????????????????????Java??????????????·????????????????????????????????????????????????????·????????????????????????? Oracle Database??????????? WebLogic Server???????????·??????????????????1???Oracle Database????????????????OpenWorld 2012?????????Oracle Database????????????????????? WebLogic Server????Oracle Real Application Clusters(RAC)?????????????????????????????????????Active GridLink for RAC??????????????????????????????????????????????????????????·?????????????Oracle RAC?????????????????·??????????????????????????????????????Oracle RAC????????????? OpenWorld 2012?????Active GridLink for RAC???????????????????????????????Application Continuity??????????????? ?????????????·???????????????Oracle RAC?????????????????????????????????????????????????????????????????Application Continuity?????JDBC???????????????????????????Oracle RAC??????????????????????????????????????????Oracle Coherence?????????????????????????????????·????????????????(???) ?????????????????·???????????????Java????????????WebLogic Server???????????????? ????????????????????????????????????????????/???????????????????WebLogic Server?????????????????????????? ??????·???????????????·????????????Java EE?????????????OpenWorld 2012????????WebLogic Server?????????????????????????????????????????????????????????????Java EE??????????????????????WebLogic Server????????????????????????????Java EE?????????????Java EE???????????????????????????(???) ????????·????????????????????????????????????Java EE????WebLogic Server?????????????????????????????????

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• It's here, it's here! OJEC 1.1 is here -- Oracle Java ME Embedded Client

  - by hinkmond

  Download it now! OJEC 1.1 has just been released and will run on your Linux/ARM, Linux/x86, or Linux/MIPS device. Get it before supplies run out! (Not really, it's software. How can it run out?) See: Download OJEC 1.1 now! Here's a quote: Oracle offers Java ME Embedded products to meet your specific Java Technology needs. Java ME is targeted for use on devices where a feature-rich Java platform is desirable, despite lacking the resources necessary to run the full Java SE Embedded environment. Try it on your Raspberry Pi! (If you can find where to buy a Raspberry Pi that is. Now that's something that can run out) Hinkmond

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• How do I get the Java plugin in Firefox 3.6 working?

  - by interstar

  I have Ubuntu 10.10. I needed the Sun Java so I added Sun Oracle as supplier of packages and installed java-6. However, I haven't been able to persuade Firefox to use this Java for the browser. In fact I managed to turn off the original Java plugin (I can't remember exactly how) and I can't see any way to re-enable it. Ie. it doesn't appear in the "plugins" page of the Add-ons option. (I'm in Firefox 3.6.13) Any suggestions for how to re-enable Java in FF 3.6, and make sure it's using the Sun version? thanks phil

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• How to get familiar with "what happens underneath of Java"?

  - by FidEliO

  I did not study CS nor IT. I just became a developer, now working with Java. Actually, since I now work with a big company writing high-scalable web applications, I think I need to be better with details. I have no understanding of what happens underneath of Java. Java Performance, Server-Side Java might be the buzz words?!! I am very poor with those more of low-level details but I do not know where to look honestly. I started looking for some keywords in Amazon, ended up reading books like "pragmatic programmer", "clean code", "code complete" which IMO they are not what I am looking for. Could you please give me some learning resources (books, articles, blog posts, online trainings) for this matter? I also read this post as well: Approaching Java/JVM internals But I think I need a pre-step before jumping into the OpenJDK, right?!

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• What would you choose for your project between .NET and Java at this point in time ?

  - by Basic

  You are just starting a new project and you have these two technologies to choose from, Java and .NET. The project you are working doesn't involve having features that would make it easy to choose between the two technologies (e.g. .NET has this that I need and Java does not) and both of them should work just fine for you (though you only need one of course). Take into account: Performance Tools available (even 3rd party tools) Cross platform compatibility Libraries (especially 3rd party libraries) Cost (Oracle seems to try and monetize Java) Development process (Easiest/Fastest) Also keep in mind that Linux is not your main platform but you would like to port your project to Linux/MacOs as well. You should definitely keep in mind the trouble that has been revolving around Oracle and the Java community and the limitations of Mono and Java as well. It would be much appreciated if people with experience in both can give an overview and their own subjective view about which they would choose and why.

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• ????:10?????Java EE???????WebLogic Server?????|WebLogic Channel|??????

  - by ???02

  WebLogic Channel????????????9?6?????WebLogic & Java EE??????????????????――Java EE???????????????????????????·??????????????????????????????UFJ??????????????????? IT??????? ??????????11?30????????? ?????? ????? 2011????????????????????·???Java??????????????????????Java EE 5???????????????????UFJ??????????????????10???????????Java EE??????????????????WebLogic Server?????????UFJ????????????????????????????????????????????????????????????????WebLogic Server?????????10???????????JavaOne???????????????Java EE??????????????????????????????Java EE??????????????????????????????????????????????????????·????????????????2011?11?30?(?) 13:00~17:30 (??12:30)???????????????·???? ????????　?????????? B2F????????4-8-1?????(?????)???????[A-1:14:45~15:30]??UFJ???????????????????Java EE???????WebLogic Server??????UFJ??????????????????10???????????Java EE??????????????????WebLogic Server?????????UFJ??????????????????????????????????????????????????????????????????WebLogic Server?????????????????????????????????????????10??????JavaOne????????????????Java EE?????????????????????????Java EE????????????????UFJ???????????????????IT??????????? ?? ???·??????????

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• Google App Engine with Java - Error running javac.exe compiler

  - by dta

  On Windows XP Just downloaed and unzipped google app engine java sdk to C:\Program Files\appengine-java-sdk I have jdk installed in C:\Program Files\Java\jdk1.6.0_20. I ran the sample application by appengine-java-sdk\bin\dev_appserver.cmd appengine-java-sdk\demos\guestbook\war Then I visited localhost:8080 to find : HTTP ERROR 500 Problem accessing /. Reason: Error running javac.exe compiler Caused by: Error running javac.exe compiler at org.apache.tools.ant.taskdefs.compilers.DefaultCompilerAdapter.executeExternalCompile(DefaultCompilerAdapter.java:473) How to Fix it? My JAVA_HOME points to C:\Program Files\Java\jdk1.6.0_20. I also tried chaning my appcfg.cmd to : @"C:\Program Files\Java\jdk1.6.0_20\bin\java" -cp "%~dp0..\lib\appengine-tools-api.jar" com.google.appengine.tools.admin.AppCfg %* It too didn't work.

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• How to get a *.cer file to add a self-signed HTTPS certificate as trusted for Java

  - by pako

  I'm connecting to a HTTPS website with a self-signed certificate using a Java applet. The applet can't open the HTTPS connection - it returns the following exception: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target So the problem is that I need to add the certificate as "trusted" for Java. I read that I should use the following command: keytool -import -alias abc -file ABCCA.cer Am I correct? How do I retrieve the *.cer file? The server is running Debian 5. I'm using Windows 7 and Java 6 on the client machine.

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• Java Web Start: unsigned cglib

  - by Pticed

  I am using hibernate on the server side with a client application started via Java Web Start. I can't sign the jars (I'd like to but I can't). I get a permission exception when I get a POJO with lazy fields. Caused by: java.security.AccessControlException: access denied (java.util.PropertyPermission cglib.debugLocation read) at java.security.AccessControlContext.checkPermission(Unknown Source) at java.security.AccessController.checkPermission(Unknown Source) at java.lang.SecurityManager.checkPermission(Unknown Source) at java.lang.SecurityManager.checkPropertyAccess(Unknown Source) at java.lang.System.getProperty(Unknown Source) at net.sf.cglib.core.DebuggingClassWriter.(DebuggingClassWriter.java:35) ... 44 more How can I avoid that? I thought about setting the collection to null before returning the pojo to the client but I'd like to find a better solution.

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• How to access the Principal from a Java service object without using FlexContext?

  - by Marplesoft

  We're building some Java objects that are exposed via BlazeDS to our flex client application. So basically the BlazeDS messagebroker servlet instantiates and invokes methods on these objects in response to client requests. Works great. We're using app server-based authentication and have set up a security constraint on the <destination> elements in the remoting-config.xml file element to prevent unauthenticated clients from being able to access these remote java objects. Again, works fine. However, there are several places within the implementation of these java objects where we want to get the currently logged on user's username. Right now we are doing this via FlexContext.getUserPrincipal(), which gives access to this but we have a nagging concern that we don't like the idea that the implementation of these objects (the service layer) has a hard dependency on a BlazeDS class. But we're not sure how else to get access to this. The same applies to accessing the ServletContext and such. Any ideas?

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• Java: opening and reading from a file without locking it.

  - by rogue780

  I need to be able to mimic 'tail -f' with Java. I'm trying to read a log file as it's being written by another process, but when I open the file to read it, it locks the file and the other process can't write to it anymore. Any help would be greatly appreciated! Here is the code that I'm using currently: public void read(){ Scanner fp = null; try{ fp = new Scanner(new FileReader(this.filename)); fp.useDelimiter("\n"); }catch(java.io.FileNotFoundException e){ System.out.println("java.io.FileNotFoundException e"); } while(true){ if(fp.hasNext()){ this.parse(fp.next()); } } }

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• java.util.MissingResourceException

  - by ashwani66476

  Hello Crew I am getting below exception while running an application. This application read abc.properties file, Exception in thread "main" java.util.MissingResourceException: Can't find bundle for base name abc, locale en_US at java.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:853) at java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:822) at java.util.ResourceBundle.getBundle(ResourceBundle.java:566) at com.ibm.dst.DailyExtract.getResourceBundle(DailyExtract.java:104) at com.ibm.dst.DailyExtract.main(DailyExtract.java:131) abc.properties file reside at the workspace. I am using RSA7 as IDE, is there any setting problem? any suggestions are welcome..... Thanks a lot in advance

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• Google App Engine with Java. Can't start:(

  - by anatolix

  Hello all! I have a problem with GAE. Even simpliest 'helloworld' app doesn't work in Eclipse. Such error appears: java.lang.IllegalStateException: SecurityManagerInstaller must be loaded in the system ClassLoader; was sun.misc.Launcher$ExtClassLoader@35ce36 at com.google.apphosting.utils.security.SecurityManagerInstaller.generatePolicyFile(SecurityManagerInstaller.java:103) at com.google.apphosting.utils.security.SecurityManagerInstaller.install(SecurityManagerInstaller.java:66) at com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer(DevAppServerFactory.java:72) at com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer(DevAppServerFactory.java:38) at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:153) at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48) at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113) at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89) What does it mean, any idea, please?:)

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• How can I print a text in two columns using Java Swing?

  - by Jonas

  I have a longer text saved in a String. I would like to print the text in two columns on a single page. How can I do this using Java Swing? I don't understand how I can wrap the text when it's time to use a new line. I have read Lesson: Printing in the Java tutorial, but I haven't found any useful methods for working with text or Strings except FontMetrics. Is there any good methods in the Java API for this or is there any good library I can use for this?

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• Java environmental variable woes, maven also

  - by Blankman

  So I re-installed java in a directory that doesn't have any spaces in it, as I was having issues with it before. Java JDK is installed in: E:\downloads\java\jdk I created a User variable: JAVA_HOME E:\downloads\java\jdk And my Path looks like: %JAVA_HOME%\bin;%M2%; Now opening a NEW cmd prompt: c:\java 'java' is not recognized... but echoing works: c:\echo %JAVA_HOME% E:\downloads\java\jdk and so does this: c:\%JAVA_HOME%\bin\java -version java version "1.6.0_17" I am trying to get this to work, so I can then get maven to work as maven is having the same type of issues (I created M2_HOME and M2 and none work). What exactly am I doing wrong? I am having the exact same issue on my laptop also, both are running windows 7. I must be missing something!

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• Java works under Firefox but not under Internet Explorer

  - by Dominic Grenier

  Java works under Firefox but not under IE. Java applet activated in security settings, activated in add-ons, activated in advanced tab; that's the advice they usually give in forums... I've also deleted my temporary internet files, reinstalled IE8 and it is also set as the default java for IE through the control panel. IE version: 8.0.6001.18702 Java version: 1.7.0_03. Windows XP SP3. Any advice? Thanks :)

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• How to deploy Java Web Application in Hostgator?

  - by Mujahid

  I have a Java Web application and I have a VPS hosting bought from Hostgator in which recently the tomcat has been installed. But I couldn't find a way to deploy my application and I talked with more than 3 Hostgator technical agents and none of them know how to deploy the Java application in tomcat in Hostgator server and they say they don't give support for hosting Java application. Does anyone have deployed any Java application in hostgator server? If you know please help me to host my application.

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