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• Happy 1st Birthday to GlassFish and Java EE

  - by pieter.humphrey

  Java EE and GlassFish are officially one year old!  As with all newborns, time moves fast and it seems like just yesterday it was shiny and new.     Feel free to post any birthday wishes on the blog comments, or even better, tell us a story about your experience with Java EE6 and GlassFish in the last year and we'll work with you to get it posted on the stories blog. http://blogs.sun.com/stories/ As all parents know, it takes a village to raise a child, and we want you as part of the village!  Get involved in the project at http://glassfish.java.net .     Technorati Tags: java,java ee,development,glassfish del.icio.us Tags: java,java ee,development,glassfish

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• Linux multiplayer server, need some help.

  - by Viktor

  I need to write a server for a game, which is closer to action type game, so needs fast communication. There must be only one server, I'll just split the world in zones, but this is not the question. Client will be written in java using jMonkeyEngine. In my opinion I should write the server in java. I don't want to implement any low level features such as communication, reliable udp, etc. Can you suggest any java libraries that already implement this? Or maybe there is more suitable languages to implement this project (must run on linux)?

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• Tab Sweep - More OSGi, Coherence, Oracle Java moves, JMS 2.0 and more

  - by alexismp

  Recent Tips and News on Java, Java EE 6, GlassFish & more : • Why I will use Java EE (JEE, and not J2EE) instead of Spring in new Enterprise Java Projects (Kai) • What is Happening vs. What is Interesting (Geertjan) • Oracle Coherence & Oracle Service Bus: REST API Integration (Nino) • Oracle's Top 10 Java Moves of 2011 (eWeek) • JEP 122: Remove the Permanent Generation (OpenJDK.org) • JEE6 – Glassfish 3.1, Clustering & Failover (Xebia.fr) • Testing LAZY mechanism in EJB 3 (e-blog-java) • Discoing with Vorpal (Chuk) • Devoxx : les évolutions de JMS 2.0 (Ippon.fr) • More OSGi... (Jarda) • Practical Migration to Java 7 - Small Codeexamples (FOSSLC) • Coherence Part III : Filtres (Zenika.com)

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• jMonkey Quest Database

  - by theJollySin

  I am building a game in jMonkey (Java) and I have so far only used default quest text. But now I need to start populating a lot of quests with text. My design requires A LOT of quests texts. What is the best way to build a database of quest texts in jMonkey? I don't have a lot of real experience with databases. Is there a database that integrates well with jMonkey? Here are the ideal properties I want in my database, in order of priority: Reasonably light learning curve Easy portability (in Java) to Windows, Linux, and Mac OSX Good interface with Java Good interface with jMonkey The ability to add properties to the quests: ID, level, gender, quest chain ID, etc. Or am I wrong in thinking I need to use some giant monster like SQL? I haven't been able to find much information on this, so are people using some non-database methods for storing things like quest text in jMonkey?

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• Is there any reason lazy initialization couldn't be built into Java?

  - by Renesis

  Since I'm working on a server with absolutely no non-persisted state for users, every User-related object we have is rolled out on every request. Consequently I often find myself doing lazy initialization of properties of objects that may go unused. protected EventDispatcher dispatcher = new EventDispatcher(); Becomes... protected EventDispatcher<EventMessage> dispatcher; public EventDispatcher<EventMessage> getEventDispatcher() { if (dispatcher == null) { dispatcher = new EventDispatcher<EventMessage>(); } return dispatcher; } Is there any reason this couldn't be built into Java? protected lazy EventDispatcher dispatcher = new EventDispatcher();

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• Good university for computer science with plans for game development

  - by DukeYore

  I am starting my computer science degree at a local community college in programming using C++. However, I will be transferring to a 4-year university. Does anyone have any insight on university programs? I know Cal State Fullerton has a degree with a minor in Game Development. however, is that as important as getting a degree from a really great school? If I could shoot for something like Cal Poly would that be better? Or even Stanford or SF State being so close to so many gaming companies up there in the Bay area? Thank you in advance for any guidance.

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• What are the downsides of implementing a singleton with Java's enum?

  - by irreputable

  Traditionally, a singleton is usually implemented as public class Foo1 { private static final Foo1 INSTANCE = new Foo1(); public static Foo1 getInstance(){ return INSTANCE; } private Foo1(){} public void doo(){ ... } } With Java's enum, we can implement a singleton as public enum Foo2 { INSTANCE; public void doo(){ ... } } As awesome as the 2nd version is, are there any downsides to it? (I gave it some thoughts and I'll answer my own question; hopefully you have better answers)

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• What is the correct way to handle debug output in Java?

  - by Federico Zancan

  As my current Java projects grow bigger and bigger, I feel a likewise growing need to insert debug output in several points of my code. To enable or disable this feature appropriately, depending on the opening or closure of the test sessions, I usually put a private static final boolean DEBUG = false at the beginning of the classes my tests are inspecting, and trivially use it this way (for example): public MyClass { private static final boolean DEBUG = false; ... some code ... public void myMethod(String s) { if (DEBUG) { System.out.println(s); } } } and the like. But that doesn't bliss me out, because of course it works but there could be too many classes in which to set DEBUG to true, if you are not staring at just a couple of them. Conversely, I (like - I think - many others) wouldn't love to put the whole application in debug mode, as the amount of text being output could be overwhelming. So, is there a correct way to architecturally handle such situation or the most correct way is to use the DEBUG class member?

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• Career in Game Development

  - by cantbereached

  Hello, I currently study computer engineering and I want to lead my career towards game industry which I always want to be a part of. But I am not sure where to start. I applied some of the companies in the industry for internship and so but most of them wants experience and some work in game developing. Many asks whether I developed a simple game or something similar which I haven't done so far. I am proficient at C, C++, Java, JS, HTML etc. Any tips from people experienced in the industry on where to start ?

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• How is game development different from other software development?

  - by Davy8

  For a solid general purpose software developer, what specifically is different about game development, either fundamentally or just differences in degree? I've done toy games like Tic-tac-toe, Tetris, and a brute-force sudoku solver (with UI) and I'm now embarking on a mid-sized project (mid-sized for being a single developer and not having done many games) and one thing I've found with this particular project is that separation of concerns is a lot harder since everything affects state, and every object can interact with every other object in a myriad of ways. So far I've managed to keep the code reasonably clean for my satisfaction but I find that keeping clean code in non-trivial games is a lot harder than it is for my day job. The game I'm working on is turn-based and the graphics are going to be fairly simple (web-based, mostly through DOM manipulation) so real time and 3d work aren't really applicable to me, but I'd still be interested in answers regarding those if they're interesting. Mostly interested in general game logic though. P.S. Feel free to retag this, I'm not really sure what tags are applicable.

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• Python or HTML5/JS for game development on 2014 [on hold]

  - by AlexKvazos

  So I've decided to give game development a go. I have experience on php/html/css/sql/js(jquery) so learning a new language shouldn't be as hard. I was reading that python and javascript are both nice for simple 2d non-intensive games. I found that python has this library/engine called PyGame but I realized that it was last updated 4 years ago. People still use this? And for javascript, I found libraries like 'pixi.js', 'melon.js' and 'cocos2d'. My goal is to make 2D games that would require the same performance as terraria, realm of the mad god, castle crashers.. and all those types of games. Taking into consideration, that I do want an updated library, what language of this two would be best to choose and what library to grab for it? Thanks in advance, sorry if question is broad. Let me know and I can edit to add more.

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• Design virtual resolution for 2D development in Unity

  - by djzmo

  I came to Unity with Cocos2D experience in mind. In Cocos2D, I can choose a "virtual" screen resolution size to rely on the entire game during development and the game will automatically adapt to different screen sizes in various devices. Now that I'm migrating to Unity and has access to 4.3 beta which has a native 2D workflow, is there a similar mechanism that will automate this? After playing around a bit with Unity, I also found out that Unity uses a neutral coordinate unit that can translate to pixels flexibly (CMIIW). But when developing a 2D game, I need them in pixels. Thank you.

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• Lwjgl or opengl double pixels

  - by Philippe Paré

  I'm working in java with LWJGL and trying to double all my pixels. I'm trying to draw in an area of 800x450 and then stretch all the frame image to the complete 1600x900 pixels without them getting blured. I can't figure out how to do that in java, everything I find is in c++... A hint would be great! Thanks a lot. EDIT : I've tried drawing to a texture created in opengl by setting it to the framebuffer, but I can't find a way to use glGenTextures() in java... so this is not working... also I though about using a shader but I would not be able to draw only in the smaller region...

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• Real life example of an agile game development process

  - by Ken

  I'm trying to learn about applying agile methodologies to game development. But seems to be impossible to find real life examples. What I am looking for are things like; Initial user stories Final user stories (complete, covering the entire game requirements) Acceptance criteria Task list Sprint backlogs (before and after each sprint) The agile books seem to have some limited examples, many of which seem contrived. In this era of open source software, there must be an documented example of the process applied to a game that is publicly available. I am asking specifically about games because they are so different from normal applications. Regular applications are built to all users to complete specific tasks in order to get stuff done(book a room, print a report etc). People play games for much less tangible reasons, so I think the process is significantly different. [it doesn't have to be scrum, it could be any process, just needs to be a real life example game and be reasonably complete]

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• Why does Java allow to implement different interfaces, each containing a method with the same signature?

  - by Software Engeneering Learner

  I've recently found that I can have two interfaces containing method with the same signature as a method in the other interface. And then I can have an interface or class that implements both of that interfaces. So the descendant class/interface has implicitly implements two different methods as a one method. Why is this allowed in Java? I can see a numerous problems that arises from that. Even eclipse only can find out about implementations for only one interface method, but for the second one it doesn't show any implementations at all. Also I believe there would be problems with automatic refactoring, like when you would like to change the signature of the method in one of the interfaces and IDE won't be able to correctly change that signature in all implementations, as they implement two different interfaces and how will IDE know what interface method it implementation descends. Why don't just make a compiler error like 'interfaces method names clashes' or something like that?

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• Why should most logic be in the monitor objects and not in the thread objects when writing concurrent software in Java?

  - by refuser

  When I took the Realtime and Concurrent programming course our lecturer told us that when writing concurrent programs in Java and using monitors, most of the logic should be in the monitor and as little as possible in the threads that access it. I never really understood why and I really would like to. Let me clarify. In this particular case we had several classes. Lift extends Thread Person extends Thread LiftView Monitor, all methods synchronized. This is nothing we came up with, our task was to implement a lift simulation with persons waiting on different floors, and theses were the class skeletons that were given. Then our lecturer said to implement most of the logic in the monitor (he was talking about class Monitor as THE monitor) and as little as possible in the threads. Why would he make a statement like that?

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• What are the fundamentals of game development?

  - by Matt

  Hi, I completely do not understand how a video game can be coded. I'm a beginner programmer and only have experience writing console applications that do math and what not. I do not understand how these logical processes can make images move on the screen (video games). Obviously if i jumped into a game development book or something like that I would understand but I am currently still getting a grasp of the fundamentals of programming in general. Could anyone give a simple explanation , coding wise, on the jump between making a computer do simple math to making a computer produce amazing graphical programs such as video games? Maybe there are some intro videos someone can point me to? I

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• How to remove java.sql.BatchUpdateException in Grails? [closed]

  - by aman.nepid

  I have a domain like this: class BusinessOrganization { static hasMany = [organizationBusinessTypes:OrganizationBusinessType] String name String icon static constraints = { name(blank:false,unique:true) icon(unique:true) } String toString() { return "${name}" } } When I save some data for first time it works fine. But when by the next time it shows this error : Error 500: Internal Server Error URI /nLocatePortal/businessOrganization/save Class java.sql.BatchUpdateException Message Batch entry 0 insert into business_organization (version, icon, name, id) values ('0', '', 'dddd', '2') was aborted. Call getNextException to see the cause. **Around line 24 of grails-app/controllers/com/nlocate/portal/BusinessOrganizationController.groovy** 21: 22: def save() { 23: def businessOrganizationInstance = new BusinessOrganization(params) 24: if (!businessOrganizationInstance.save(flush: true)) { 25: render(view: "create", model: [businessOrganizationInstance: businessOrganizationInstance]) 26: return 27: } Please someone help me why this is happening. I am new to Grails. I have not modified the controllers but still I get this error.

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• i am going to start learning to develop games, and have a very importent question

  - by levi s.

  so i am going to be starting to start learning to develop games soon, and i have already learned the basics of java. before i really go balls out. am i making a bad choice of language? should i stop now and move to c++ or c#? will that hinder me? is java going to hinder me worse? im kinda having regrets on saying "oh hey minecraft was made in java, it must be best!" im mainly asking, what should i do?

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• Why is it java code indented as BSD KNF Style and C C++ code indented as Allman or BSD style?

  - by Caffeine

  I do understand that coding convention is a matter of preference, and that different coding conventions have different subtle advantages or shortcomings, and depending on what one wants, one should choose his/her style. But why is usually Java written where the opening brace is on the same line as the function definition of control statement, and in C or C++ the curly braces have a line of their own? BSD KNF style if (data != NULL && res > 0) { if (JS_DefineProperty(cx, o, "data", STRING_TO_JSVAL(JS_NewStringCopyN(cx, data, res)), NULL, NULL, JSPROP_ENUMERATE) != 0) { QUEUE_EXCEPTION("Internal error!"); goto err; } PQfreemem(data); } else { if (JS_DefineProperty(cx, o, "data", OBJECT_TO_JSVAL(NULL), NULL, NULL, JSPROP_ENUMERATE) != 0) { QUEUE_EXCEPTION("Internal error!"); goto err; } } Allman or BSD Style if (x == y) { something(); somethingelse(); } Courtesy: http://en.wikipedia.org/wiki/Indent_style

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• Why does java.util.ArrayList allow to add null?

  - by Alfredo O

  I wonder why java.util.ArrayList allows to add null. Is there any case where I would want to add null to an ArrayList? I am asking this question because in a project we had a bug where some code was adding nulls to the List and it was hard to spot where the bug was. Obviously a NullPointerException was thrown but not until another code tried to access the element. The problem was how to locate the code that added the null object. It would have been easier if the ArrayList throwed an exception in the code where the elements was being added.

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• What web oriented language would work best with binary data?

  - by Qqwy

  I want to create a service where people can upload files. However, since file storage costs money, I want to compress the files so they take less space. I would want to write my own compression algorithm, however, PHP doesn't have good ways to handle binary data (which is needed for many compression algorithms). So I wondered, what would be a better language to create such a website in? I have knowledge of PHP (and Javascript, HTML and CSS) but no experience with other things like Ruby, Perl, Python, and other web development languages.

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• Starting out with 2D cross-platform game development [closed]

  - by Aran

  I am wanting to challenge myself to build a simple game, that has a character and a randomly generated world. If I get anywhere with it I may perhaps I'll develop it into something more, but the key challenge I want to tackle is cross-platform. I'd also want to have a go at creating engine myself, doing lighting and other bits. Is it worth me using a system like Unity or do I go down a more custom route? The game I would like to make is a 2D game so whether that changes the tools I should use, it would be great to know as well. Supporting mobiles isn't something I am worried about at moment, just looking for Mac and Windows for time being. In future I'll consider other platforms if I get anywhere with the development. So if anyone has any recommendations for a language, engine or system to use would love to her your thoughts.Including pros and cons would be helpful and appreciated and if you can do comparisons that would be awesome as well!

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• Importance of certifications for Java programmer without BS degree?

  - by programmx10

  I've read some posts here and other places about how a lot of people don't put much value in certifications but I am beginning to think it may be necessary for me at this point to be able to move to a bigger company, etc. I currently work as a Java programmer with a startup and worked with a small company before that. Now that I'm applying with larger companies the hr people / recruiters have been asking a lot about certifications and some have directly suggested that someone in my position should probably get a few (they were trying to be helpful) since I haven't completed a BS degree yet (I bounced around a bit in college and ended up not finishing but have enough units to finish eventually, just its not something I can do nearly as easily as getting certifications). Anyways, just curious about what people think for someone in my situation where I do have an interested in working for large companies and do not currently have a BS degree (but do have experience already in the field). Any advice on which certifications beyond the SCJP would be appreciated as well

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• Which are the most frequent exceptions thrown in Java applications? [on hold]

  - by Chris

  1. Do you know of any statistics about the frequency of exceptions (checked and unchecked) thrown at runtime in typical Java applications? for example: NullPointerException: 25% of all exceptions ClassCastException: 15% of all exceptions etc. 2. Which are the most frequent exceptions according to your own experiences? 3. Would you agree that the NullPointerException is generally the most often thrown exception? I am asking this question in the context of the compiler development of the PPL programming language (www.practical-programming.org). The goal is to auto-detect a maximum of frequent exceptions at compile-time. For example, detecting all potential NullPointerExceptions at compile-time leads to null-safe software which is more reliable.

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