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• Google I/O 2012 - Designing for the Other Half: Sexy Isn't Always Pink

  Google I/O 2012 - Designing for the Other Half: Sexy Isn't Always Pink Leah Busque, Sepideh Nasiri, Jess Lee, Tracy Chou, Margaret Wallace Women control 80 percent of consumer spending and drive the majority of user activity on many of the largest social networks. Female gamers over 55 spend the most time online gaming among any demographic. Are you thinking about how your product or business is attracting and engaging women? Hear from our panel on the technologies winning over female users that aren't so pink. From: GoogleDevelopers Views: 15 1 ratings Time: 59:33 More in Science & Technology

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• How to create Executable Jar

  - by Siddharth

  When I try to create a jar file i found the following error, so please someone help me to out of this. Exception in thread "LWJGL Application" com.badlogic.gdx.utils.GdxRuntimeException: Couldn't load file: img/black_ring.png at com.badlogic.gdx.graphics.Pixmap.(Pixmap.java:137) at com.badlogic.gdx.graphics.glutils.FileTextureData.prepare(FileTextureData.java:55) at com.badlogic.gdx.graphics.Texture.load(Texture.java:175) at com.badlogic.gdx.graphics.Texture.create(Texture.java:159) at com.badlogic.gdx.graphics.Texture.(Texture.java:133) at com.badlogic.gdx.graphics.Texture.(Texture.java:122) at com.badlogic.runningball.UserBall.(UserBall.java:19) at com.badlogic.runningball.GameScreen.(GameScreen.java:25) at com.badlogic.runningball.RunningBall.create(RunningBall.java:12) at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:126) at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:113) Caused by: com.badlogic.gdx.utils.GdxRuntimeException: File not found: img/black_ring.png (Internal) at com.badlogic.gdx.files.FileHandle.read(FileHandle.java:108) at com.badlogic.gdx.files.FileHandle.length(FileHandle.java:364) at com.badlogic.gdx.files.FileHandle.readBytes(FileHandle.java:156) at com.badlogic.gdx.graphics.Pixmap.(Pixmap.java:134) ... 10 more

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• AGPL License - does it apply in this scanerio?

  - by user1645310

  There is an AGPLv3 based software (Client) that makes web service calls (using SOAP) to another software (Server - commercial, cloud based). There is no common code or any connection whatsoever between these two except for the web service calls being made. My questions - Does the Server need to be AGPL too? I guess not - but would like to confirm. Let us say the end point URL for the Server can be configured on the Client side (by editing an XML file) to connect it to different Servers (again, there is no connection other than the webservice calls being made) does it require any of these Servers being AGPL? Are there any issues in running the Client as a DLL that is loaded by other commercial applications on users' desktops? Does it require these other applications also to be AGPL? Appreciate your quick response. Pluto!

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• Java Developers: Is Ant still in the "main stream" for builds? Do we push new developers to learn it?

  - by Sam Goldberg

  We have been slowly replacing batch command files (windows .bat) which were simply jarring up the classes compiled in the developers IDE, with more comprehensive Ant builds (i.e. get from CVS, clean compile, jar, archive, email, etc.) I've spent a lot of time learning (and debugging issues) with Ant, so I'm most comfortable using it for these tasks. But I wonder if Ant is still in as wide usage as it was when I first started learning, or whether "the world has moved on" to something newer (and maybe slicker). (I've started to see more Maven build stuff distributed, which I've never used, for example.) The practical import of this question, is whether I push new developers to learn Ant, or whether they should be learning something else for builds? I'm never too on top of the trends, so it would be great to hear from other Java developers what they think is the best build tool, and what they think new developers should be learning.

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• Google I/O 2011: Accelerated Android Rendering

  Google I/O 2011: Accelerated Android Rendering Romain Guy, Chet Haase Android 3.0 introduced a new hardware accelerated 2D rendering pipeline. In this talk, you will be introduced to the overall graphics architecture of the Android platform and get acquainted with the various rendering APIs at your disposal. You will learn how to choose the one that best fits your application. This talk will also deliver tips and tricks on how to use the new hardware accelerated pipeline to its full potential. From: GoogleDevelopers Views: 11086 62 ratings Time: 48:58 More in Science & Technology

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• How to solve problems with movement in simple tile based multiplayer game?

  - by Murlo

  I'm making a simple tile based 2D multiplayer game in JavaScript using socket.io where you can move one tile every 200 ms. The two solutions I've tried are as follows: The client sends "walk one tile north" every 200 ms. Problem: People can easily hack the client to send the action more often. The client sends "walking north" and "stopped walking". Problem: Sometimes the player moves extra steps when "stopped walking" doesn't arrive in time. Do you know a way around these problems or is there a better way to do it? EDIT: Regarding the first solution I've tried adding validation on the server to check if it has been 200 ms since last movement. The problem is that latency still encourages people just to spam the action as much as possible, giving them an unfair advantage.

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• Google I/O 2012 - High Performance HTML5

  Google I/O 2012 - High Performance HTML5 For years we built web apps that far outpaced the capabilities of the browsers they ran in. Just as the browsers were catching up HTML5 came on the scene - video and audio, canvas, SVG, app cache, localStorage, @font-face, and more. Now the browsers are racing to stay ahead of the wave that's building as developers adopt these new capabilities. Is your HTML5 app going to ride the wave or be dashed on the rocks leaving users stranded? Learn which HTML5 features to seek out and which to avoid when it comes to building fast HTML5 web apps. This session will be live captioned. From: GoogleDevelopers Views: 91 1 ratings Time: 01:02:07 More in Science & Technology

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• AGPL License - does it apply in this scenario?

  - by user1645310

  There is an AGPLv3 based software (Client) that makes web service calls (using SOAP) to another software (Server - commercial, cloud based). There is no common code or any connection whatsoever between these two except for the web service calls being made. My questions - Does the Server need to be AGPL too? I guess not - but would like to confirm. Let us say the end point URL for the Server can be configured on the Client side (by editing an XML file) to connect it to different Servers (again, there is no connection other than the webservice calls being made) does it require any of these Servers being AGPL? Are there any issues in running the Client as a DLL that is loaded by other commercial applications on users' desktops? Does it require these other applications also to be AGPL?

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• Wide gap in my resume as a Java developer. What are must-have skills required to get hired those days? [closed]

  - by OnlineAlien

  For some legal reasons I haven't worked for anybody for the last 12 years. I am a java web developer or at least I am thinking so. For this period I have been working on my project- some sort of business network - and I did few small jobs, so right now I feel I am far behind in terms of my skills and the skills needed today. I lingered too long on Struts and Hibernate and thought that could the job for my project. I need to get a job, right now, so I am spending most of my time brushing my skills. My question is: What are the current necessary skills that could convince employers to hire me regardless of my past employment or the lack of it. Right now I am on AspectJ, IoC and Spring Thanks

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• Introduction to Google Apps Script Triggers

  Introduction to Google Apps Script Triggers Love Apps Script, but wish that it would just automatically work in the background? We've got just the thing for you - Triggers! This show will be an introductory level show about how to set up Apps Script so your scripts are run on a schedule, or in response to certain events like a spreadsheet being edited or a form submission. We'll talk about what triggers are, how to manually schedule triggers, how to programmatically create them, and some of the cool things you can do with them. From: GoogleDevelopers Views: 87 13 ratings Time: 50:17 More in Science & Technology

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• Protecting the integrity of a game state while minimizing amount of data sent

  - by espais

  I'm developing a game in PHP/jQuery, and naturally have to be wary of any sort of data coming from the client. At present, I have tables of data representing the map (2D roguelike), monsters, items, and player(s). Initially, my thought was to simply package it all in a JSON object and send it every game tick, however when actually looking at the data I realized that's quite a large packet to be sending. So, my question is what is a good approach for minimizing data sent to the client? Obviously I would need to figure out some way of validating whatever it sends back. Initially we'd hoped to do some minimal verification on the client-side, but each time we thought of one thing we could do it is immediately invalidated with tools like Firebug. Kind of an open question I realize, but we want to get this right before we move on with our implementation so we don't have to shoehorn in bugfixes later on.

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• JPA 2?EJB 3.1?JSF 2????????! WebLogic Server 12c?????????Java EE 6??????|WebLogic Channel|??????

  - by ???02

  ????????????????????????????????????????·???????????Java EE 6???????????????·????WebLogic Server 12c?(???)?????????Oracle Enterprise Pack for Eclipse 12c?????Java EE 6??????3???????????????????????JSF 2.0?????????????????????????JAX-RS????RESTful?Web???????????????(???)?????????????JSF 2.0????????????????　Java EE 6??????????????????????????????????????JSF(JavaServer Faces) 2.0??????????Java EE?????????????????????????????????Struts????????????????????????????????JSF 2.0?Java EE 6??????????????????????????????????????????????????JSP(JavaServer Pages)?JSF???????????????????????·???????????????????????Web????????????????????????????????????????????????????????????????????????????????　???????????????????????????????EJB??????????????EMPLOYEES??????????????????????XHTML????????????????????????????????????????????????????????????ManagedBean????????????JSF 2.0?????????????????????　?????????Oracle Enterprise Pack for Eclipse(OEPE)?????????????????Eclipse(OEPE)???????·?????OOW?????????????????·???????????Properties?????????????????·???·????????????????????????????Project Facets????????????JavaServer Faces?????????????Apply?????????OK????????????　???JSF????????????????????????????ManagedBean???IndexBean?????????????OOW??????????????????·???????????????NEW?-?Class??????New Java Class??????????????????????Package????managed???Name????IndexBean???????Finish????????????　?????IndexBean??????·????????????????????????????????????????????IndexBean(IndexBean.java)?package managed;import java.util.ArrayList;import java.util.List;import javax.ejb.EJB;import javax.faces.bean.ManagedBean;import ejb.EmpLogic;import model.Employee;@ManagedBeanpublic class IndexBean {　　@EJB　　private EmpLogic empLogic;　　private String keyword;　　private List<Employee> results = new ArrayList<Employee>();　　public String getKeyword() {　　　　return keyword;　　}　　public void setKeyword(String keyword) {　　　　this.keyword = keyword;　　}　　public List getResults() {　　　　return results;　　}　　public void actionSearch() {　　　　results.clear();　　　　results.addAll(empLogic.getEmp(keyword));　　}}　????????????????keyword?results??????????????????????????????Session Bean???EmpLogic?????????????????@EJB?????????????????????????????????????????????????????????????????????actionSearch??????????????EmpLogic?????????·????????????????????result????????　???ManagedBean?????????????????????????????????????????·??????OOW??????????????WebContent???????index.xhtml?????　???????????index.xhtml????????????????????????????????????????????????(Index.xhtml)?<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 　　"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"　　xmlns:ui="http://java.sun.com/jsf/facelets"　　xmlns:h="http://java.sun.com/jsf/html"　　xmlns:f="http://java.sun.com/jsf/core"><h:head>　　<title>Employee??????</title></h:head><h:body>　　<h:form>　　　　<h:inputText value="#{indexBean.keyword}" />　　　　<h:commandButton action="#{indexBean.actionSearch}" value="??" />　　　　<h:dataTable value="#{indexBean.results}" var="emp" border="1">　　　　　　<h:column>　　　　　　　　<f:facet name="header">　　　　　　　　　　<h:outputText value="employeeId" />　　　　　　　　</f:facet>　　　　　　　　<h:outputText value="#{emp.employeeId}" />　　　　　　</h:column>　　　　　　<h:column>　　　　　　　　<f:facet name="header">　　　　　　　　　　<h:outputText value="firstName" />　　　　　　　　</f:facet>　　　　　　　　<h:outputText value="#{emp.firstName}" />　　　　　　</h:column>　　　　　　<h:column>　　　　　　　　<f:facet name="header">　　　　　　　　　　<h:outputText value="lastName" />　　　　　　　　</f:facet>　　　　　　　　<h:outputText value="#{emp.lastName}" />　　　　　　</h:column>　　　　　　<h:column>　　　　　　　　<f:facet name="header">　　　　　　　　　　<h:outputText value="salary" />　　　　　　　　</f:facet>　　　　　　　　<h:outputText value="#{emp.salary}" />　　　　　　</h:column>　　　　</h:dataTable>　　</h:form></h:body></html>　index.xhtml???????????????????ManagedBean???IndexBean??????????????????????????????IndexBean?????actionSearch??????????h:commandButton????????????????????????????????????????　???Web???????????????(web.xml)??????web.xml???????·?????OOW???????????WebContent?-?WEB-INF??????　?????????????web-app??????????????welcome-file-list(????)?????????????Web???????????????(web.xml)?<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:javaee="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="3.0">　　<javaee:display-name>OOW</javaee:display-name>　　<servlet>　　　　<servlet-name>Faces Servlet</servlet-name>　　　　<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>　　　　<load-on-startup>1</load-on-startup>　　</servlet>　　<servlet-mapping>　　　　<servlet-name>Faces Servlet</servlet-name>　　　　<url-pattern>/faces/*</url-pattern>　　</servlet-mapping>　　<welcome-file-list>　　　　<welcome-file>/faces/index.xhtml</welcome-file>　　</welcome-file-list></web-app>　???JSF?????????????????????????????　??????Java EE 6?JPA 2.0?EJB 3.1?JSF 2.0????????????????????????????????????????????????????????????????·?????OOW???????????·???????????????Run As?-?Run on Server??????????????????????????????????????????????????????????Oracle WebLogic Server 12c(12.1.1)??????Next???????????????　?????????????????????Domain Directory??????Browse????????????????????????C:\Oracle\Middleware\user_projects\domains\base_domain??????Finish????????????　?????WebLogic Server?????????????????????????????????????????????????????????????????????OEPE??Servers???????Oracle WebLogic Server 12c???????????·???????????????Properties??????????????????????????????WebLogic?-?Publishing????????????Publish as an exploded archive??????????????????OK????????????　???????????????????????????????????????????·?????OOW???????????·???????????????Run As?-?Run on Server??????????????????Finish????????????　???????????????????????????????????????????????·??????????????????????????????????????????firstName?????????????????JAX-RS???RESTful?Web???????　?????????JAX-RS????RESTful?Web???????????????　Java EE??????????Java EE 5???SOAP????Web??????????JAX-WS??????????Java EE 6????????JAX-RS?????????????RESTful?Web????????????·????????????????????????JAX-RS????????Session Bean??????·?????????Web???????????????????????????????????????????????JAX-RS??????????　?????????????????????????????JAX-RS???RESTful Web??????????????????????????·?????OOW???????????·???????????????Properties???????????????????????????Project Facets?????????????JAX-RS(Rest Web Services)???????????Further configuration required?????????????Modify Faceted Project???????????????JAX-RS??????·?????????????????JAX-RS Implementation Library??????Manage libraries????(???????????)??????????????　??????Preference(Filtered)???????????????New????????????????New User Library????????????????User library name????JAX-RS???????OK???????????????????Preference(Filtered)?????????????Add JARs????????????????????????C:\Oracle\Middleware\modules \com.sun.jersey.core_1.1.0.0_1-9.jar??????OK????????????　???Modify Faceted Project??????????JAX-RS Implementation Library????JAX-RS????????????????????JAX-RS servlet class name????com.sun.jersey.spi.container.servlet.ServletContainer???????OK?????????????Project Facets???????????????????OK??????????????????　???RESTful Web??????????????????????????????????(???????EmpLogic?????????????)??RESTful Web?????????????EmpLogic(EmpLogic.java)?package ejb; import java.util.List; import javax.ejb.LocalBean; import javax.ejb.Stateless; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.ws.rs.GET;import javax.ws.rs.Path;import javax.ws.rs.PathParam;import javax.ws.rs.Produces;import model.Employee; @Stateless @LocalBean @Path("/emprest")public class EmpLogic { 　　　　@PersistenceContext(unitName = "OOW") 　　　　private EntityManager em; 　　　　public EmpLogic() { 　　　　}　　@GET　　@Path("/getname/{empno}")  // ?　　@Produces("text/plain")  // ?　　public String getEmpName(@PathParam("empno") long empno) {　　　　Employee e = em.find(Employee.class, empno);　　　　if (e == null) {　　　　　　return "no data.";　　　　} else {　　　　　　return e.getFirstName();　　　　}　　}}　?????????????????????@Path("/emprest ")????????????RESTful Web????????????HTTP??????????????JAX-RS????????????????????????RESTful Web?????Web??????????????????@Produces???????(?)??????????????????????????text/plain????????????????????????????application/xml?????????XML???????????application/json?????JSON??????????????????　???????????????Web???????????????????????????????????????·?????OOW???????????·???????????????Run As?-?Run on Server??????????????????Finish???????????????????Web??????http://localhost:7001/OOW/jaxrs/emprest/getname/186????????????????URL?????????(186)?employeeId?????????????firstName????????????????*　　　　*　　　　*　????????3??????WebLogic Server 12c?OEPE????Java EE 6?????????????????Java EE 6????????????????·????????????????????????????Java EE?????????????????????????????????????????????????????????????????????????????????

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• Java Plist XML Parsing

  - by Jannis

  Hello everyone, I'm parsing a (not well formed) Apple Plist File with java. My Code looks like this: InputStream in = new FileInputStream( "foo" ); XMLInputFactory factory = XMLInputFactory.newInstance(); XMLEventReader parser = factory.createXMLEventReader( in ); while (parser.hasNext()){ XMLEvent event = parser.nextEvent(); //code to navigate the nodes } The parts I"m parsing are looking like this: <dict> <key>foo</key><integer>123</integer> <key>bar</key><string>Boom &amp; Shroom</string> </dict> My problem is now, that nodes containing a ampersand are not parsed like they should because the ampersand is representing a entity. What can i do to get the value of the node as a complete String, instead of broken parts? Thank you in advance.

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• Need Java https proxy which can be enhanced to emulate production https proxy behaviour

  - by Thorbjørn Ravn Andersen

  I have a production environment which require access through a proxy server. Occasionally said server returns blank responses badly confusing the Metro web service library causing all kinds of interesting RuntimeExceptions. I believe the proxy is Squid. In order to handle these better, I would like to set up a similar scenario here with a local proxy under my control causing all kinds of interesting failures. A quick survey strongly indicated I was not asking right. So, the question is, is there a simple, open source HTTPS/HTTP whatever proxy written in Java suitable for this purpose?

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• java.lang.ClassCastException: org.postgresql.jdbc4.Jdbc4Connection cannot be cast to org.postgresql.jdbc4.Jdbc4Connection

  - by ???????? ??????

  I want to get PGConnection from posgresql connection in JBOSS AS7 (Data source postgresql-9.0-801.jdbc4.jar) I've got cast exception when used (WrappedConnection)connection So now I use reflection(JDK 1.7): private static PGConnection getPGConnection(Connection connection) throws SQLException { if(connection instanceof PGConnection) { return (PGConnection)connection; } try { Class[] parms = null; Method method =(connection.getClass()).getMethod("getUnderlyingConnection", parms); return (PGConnection) jdbc4Conn; } catch ... and catch exception java.lang.ClassCastException: org.postgresql.jdbc4.Jdbc4Connection cannot be cast to org.postgresql.jdbc4.Jdbc4Connection It is the same class!!! Haw could it be?

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• Java Simple WGS84 Lat Lon to Pixel X, Y

  - by Cnich

  I've read a multitude of information regarding map projection today. The amount of information available is overwhelming. I am attempting to simply convert lat, long values into a screen X, Y coordinate not using any map. I do not need the values projected onto any map, just on the window. The window itself is representing approx. a 1500x1500 meter location. Lat, Long accuracy needed is to a 1/10th of a second. What may be some simpler ways in converting lat/long representation to the screen? I've read several articles and post regarding translation onto images, but nothing related to the natural java coordinate system. Thanks for any insight.

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• It won't create a Java VM (JNI)

  - by Michael Bruckmeier

  My simple command line app: int _tmain(int argc, _TCHAR* argv[]) { JavaVM *jvm; JNIEnv *env; JavaVMInitArgs vm_args; JavaVMOption options[1]; options[0].optionString = "-Djava.class.path=."; //Path to the java source code vm_args.version = JNI_VERSION_1_6; //JDK version. This indicates version 1.6 vm_args.nOptions = 1; vm_args.options = options; vm_args.ignoreUnrecognized = 0; jint ret = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args); return 0; } gives me: Error occurred during initialization of VM Unable to load native library: Can't find dependent libraries The breakpoint at "return 0" is never reached. jvm.dll resides in same directory as my command line app. I don't get it what's wrong. Any Ideas? Thanx in advance

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• simulate backspace key with java.awt.Robot

  - by Tyler

  There seems to be an issue simulating the backspace key with java.awt.Robot. This thread seems to confirm this but it does not propose a solution. This works: Robot rob = new Robot(); rob.keyPress(KeyEvent.VK_A); rob.keyRelease(KeyEvent.VK_A); This doesn't: Robot rob = new Robot(); rob.keyPress(KeyEvent.VK_BACK_SPACE); rob.keyRelease(KeyEvent.VK_BACK_SPACE); Any ideas? Thanks!

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• Axis 1.4 Java: Modify HTTP response code

  - by Achim Bitzer

  Hello, Is there a way to modify the HTTP response code when using apache axis 1.4 for java? This would be useful for testing purposes, for example simulating server side errors. I've already tried the following: Set the HTTP code directly in the http servlet Request: MessageContext context = MessageContext.getCurrentContext(); HttpServletResponse response = (HttpServletResponse) context.getProperty( HTTPConstants.MC_HTTP_SERVLETRESPONSE); response.setStatus(e.getErrorCode()); // no effect Set the HTTP code as axis message context property: MessageContext context = MessageContext.getCurrentContext(); context.setProperty(HTTPConstants.MC_HTTP_STATUS_CODE, e.getErrorCode()); But this didn't seem to work, the actual HTTP code always was 200. Any ideas would be greatly appreciated :-) Greetings, Achim Bitzer

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• Java generics: What is the compiler's issue here?

  - by Epaga

  I have the following methods: public <T> T fromJson( Reader jsonData, Class<T> clazz ) { return fromJson( jsonData, (Type)clazz ); } public <T> T fromJson( Reader jsonData, Type clazz ) { ... } The compiler is saying about the first method: type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds T,java.lang.Object return fromJson( jsonData, (Type)clazz ); ^ What is the problem?

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• Installer for java application

  - by bguiz

  Hi, I would like to know what packages are out there that can be used to create installers to distribute applications. The target application is written in Java. The installer must be able to: be compiled via an ant script be compiled Linux (and Windows) run on Windows and Linux detect / handle previously installed versions of the application We currently use IzPack, because it does all of the above, except the latter: It cannot easily detect previously installed version of the software. Are there any other packages out there which fit the bill? Thank you!

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• What is the single best free Eclipse plugin for a Java developer

  - by Bill Michell

  Some Eclipse plugins are mandated by your environment. The appropriate source code management plugin, for example - and I'm not interested in those. Some provide useful enhancements, but in a specific niche. I'm not interested in those. Some are great, but cost money. I'm not interested in those. Some were really useful on older versions of Eclipse, but are now part of the core build of the latest Eclipse version (3.4 as I write this). I'm not interested in those. I want advice on which plugins every Java SE developer should be installing, one per answer please.

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• Collision Detection - Java - Rectangle

  - by Trizicus

  I would like to know if this is a good idea that conforms to best practices that does not lead to obscenely confusing code or major performance hit(s): Make my own Collision detection class that extends Rectangle class. Then when instantiating that object doing something such as Collision col = new Rectangle(); <- Should I do that or is that something that should be avoided? I am aware that I 'can' but should I? I want to extend Rectangle class because of the contains() and intersects() methods; should I be doing that or should I be doing something else for 2D collision detection in Java?

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• java UnsatisfiedLinkError awt.image

  - by Allen

  I have a program that makes use of the following method to get a scaled instance of an image icon: public ImageIcon createScaledImageIcon(String filename) { ImageIcon icon = new ImageIcon(filename); Image image = icon.getImage().getScaledInstance(cardWidth, cardHeight, Image.SCALE_SMOOTH); icon.setImage(image); return icon; } I don't know if it's the source of the problem or not. But i get the following error messages: Exception in thread "Image Fetcher 0" java.lang.UnsatisfiedLinkError: sun.awt.image.ImageRepresentation.setBytePixels(IIII[BIILsun/awt/image/ByteComponentRaster;I)V at sun.awt.image.ImageRepresentation.setBytePixels(Native Method) at sun.awt.image.ImageRepresenation.setPixels(Unknown Source) at sun.awt.image.ImageDecoder.setPixels(Unknown Source) at sun.awt.image.GIFImageDecoder.sendPixels(Unknown Source) ... Let me know if there is any other information I could include that might be of use.

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• Java: ArrayList bottleneck

  - by Jack

  Hello, while profiling a java application that calculates hierarchical clustering of thousands of elements I realized that ArrayList.get occupies like half of the CPU needed in the clusterization part of the execution. The algorithm searches the two more similar elements (so it is O(n*(n+1)/2) ), here's the pseudo code: int currentMax = 0.0f for (int i = 0 to n) for (int j = i to n) get content i-th and j-th if their similarity > currentMax update currentMax merge the two clusters So effectively there are a lot of ArrayList.get involved. Is there a faster way? I though that since ArrayList should be a linear array of references it should be the quickest way and maybe I can't do anything since there are simple too many gets.. but maybe I'm wrong. I don't think using a HashMap could work since I need to get them all on every iteration and map.values() should be backed by an ArrayList anyway.. Otherwise should I try other collection libraries that are more optimized? Like google's one, or apache one.. Thanks

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