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  • What java web application framework to use?

    - by frohiky
    One of the main products of my company is an Oracle Forms (and Reports) based application, that "needs" to be re-written in another technology. Why? Users want a more rich interface experience, and we want, preferably, to reduce costs with an open source application server. For this (HUGE) project, we intend to use a java web application framework, keep these points in mind: We have: hundreds of tables on our database (the ORM must be as flexible as possible); some logic which is (and will still be) based on PL/SQL procedures/functions/packages; a lot of CRUDs (the application itself is of an considerable size); a demand to work with/generate documents and workflows; an intranet based user environment; We want: to offer a RIA interface experience; use (if possible) an open source app server; a rapid (as possible) development framework; a somewhat mature framework with a "wise" roadmap (and a considerable community support); a MVC approach combined with JS or GWT widgets (e.g. Vaadin or SmartGWT); Well, in the past weeks I've read a lot of posts, Q&As on stackoverflow, and much more: Wicket, JSF, Tapestry, Grails, GWT, Struts2, Play, Spring, Seam, Echo, .... the list goes on! I've even researched about Alfresco..! The obvious question: Which one to use? At this time, any insight, recommendation, shared experience, advice will be more then welcome!

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  • Why does the Java VM process eat up more RAM then specified in -Xmx parameter?

    - by evilpenguin
    I have multiple servers running CentOS 5.4 and only one application running on Java VM. I've configured the Java VM with the following arguments: java -Xmx4500M -server -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:NewSize=1024m -Djava.net.preferIPv4Stack=true -Dcom.sun.management.jmxremote=true The machines I'm running the VM on has 6 GB RAM and no other applications running. After a while, the java process starts to hit the swap space really hard, I get this info out of the top command: 7658 root 25 0 11.7g 3.9g 4796 S 39.4 67.3 543:54.17 java On the other hand, if I connect via JConsole, it reports the Java VM has 2.6 GB used, 4.6 GB commited and 4.6 Gb max. java -version returns: java version "1.6.0_17" Java(TM) SE Runtime Environment (build 1.6.0_17-b04) Java HotSpot(TM) 64-Bit Server VM (build 14.3-b01, mixed mode) Why is the Java VM expanding so much past it's allocated heap size? And where does that memory go, if it's not reported in JConsole?

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  • JDK 8 install in ubuntu

    - by maamaa
    I'm tring to install jdk 8 for weeks, but it fails.Following are some outputs, sudo update-alternatives --config java There is only one alternative in link group java (providing /usr/bin/java): /opt/java-oracle/jdk1.8.0/bin/java Nothing to configure. which java /usr/bin/java java bash: /usr/local/java/jdk1.7.0_51/bin/java: No such file or directory ls -l /usr/bin/java /usr/bin/java -> /etc/alternatives/java ls -l /etc/alternatives/java /etc/alternatives/java -> /opt/java-oracle/jdk1.8.0/bin/java sudo update-alternatives --config javac /opt/java-oracle/jdk1.8.0/bin/javac 1 manual mode javac Error: could not find libjava.so Error: Could not find Java SE Runtime Environment. If you can please give me a help to slove this problem. Thank You

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  • High data on recv-q buffer and thread lock on java.io.BufferedInputStream in linux

    - by Sagar Patel
    We have a java application running on linux (ubuntu server). We have been facing high recv-q problem since quite some time. Application gets hang and does not read data from socket every few hours. In thread dump, we have found below stack trace. "Receiver-146" daemon prio=10 tid=0x00007fb3fc010000 nid=0x7642 runnable [0x00007fb5906c5000] java.lang.Thread.State: RUNNABLE at java.net.SocketInputStream. socketRead0(Native Method) at java.net.SocketInputStream.read(SocketInputStream.java:150) at java.net.SocketInputStream.read(SocketInputStream.java:121) at java.io.BufferedInputStream.fill(BufferedInputStream.java:235) at java.io.BufferedInputStream.read1(BufferedInputStream.java:275) at java.io.BufferedInputStream.read(BufferedInputStream.java:334) - locked <0x00000007688f1ff0> (a java.io.BufferedInputStream) at org.smpp.TCPIPConnection.receive(TCPIPConnection.java:413) at org.smpp.ReceiverBase.receivePDUFromConnection(ReceiverBase.java:197) at org.smpp.Receiver.receiveAsync(Receiver.java:351) at org.smpp.ReceiverBase.process(ReceiverBase.java:96) at org.smpp.util.ProcessingThread.run(ProcessingThread.java:199) at java.lang.Thread.run(Thread.java:722) We are not able to trace the exact reason behind this? Kindly help. We are using 16 core machine and load on the system is around 30-40 at the time of issue. We use command ss dst <ip> to find out recv-q. Recently we have been facing issues with recv-q size getting hung, were in receive buffer gets stuck at some point of time. But recvQ size is not decreasing and as a result we are losing a lot of hits from the other side, our application is not accepting any data.

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  • How do I switch between Java 7 and Java 6 on mac OS X 10.8.2?

    - by Nikita Jerschow
    I am using Java SE 7 to program simple games for windows and mac, but I have to switch to java 6 to run games such as Minecraft on my computer. This used to work just fine before I updated to Mac OS X 10.8.2 Build 12C60. Before this update I used to be able to open java preferences and check off java 6 or java 7. But now I don't seem to be able to find java preferences. I am running mac OS X 10.8.2 (latest version) Thanks.

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  • Why I get java.net.SocketException: Connection reset

    - by Jammy
    I need sent some requests to server side and get reponse, sometimes when I call specific method to run the flollowing common code, I get one error in line(addToCookieJar(connection);), any idea how this get happened? URL url = new URL(providerURL); HttpURLConnection connection = (HttpURLConnection)url.openConnection(); connection.setRequestMethod("POST"); connection.setDoInput(true); connection.setDoOutput(true); connection.setUseCaches(false); connection.setRequestProperty("Content-Type", "application/octet-stream"); // We understand gzip encoding connection.addRequestProperty("Accept-Encoding", "gzip"); if (cookie != null && cookieHandler != null) { connection.setRequestProperty("Cookie", cookie); } if (cookieHandler == null) { addFromCookieJar(connection); } // Send the request ObjectOutputStream oos = new ObjectOutputStream(connection.getOutputStream()); oos.writeObject(remote.getName()); oos.writeObject(m.getName()); // method name oos.writeObject(m.getParameterTypes()); // formal parameters oos.writeObject(args); // actual parameters oos.flush(); oos.close(); if (cookieHandler == null) { cookieJar.put(new URI(providerURL), connection.getHeaderFields()); } Exception: java.lang.reflect.UndeclaredThrowableException at $Proxy0.updateDocument(Unknown Source) at com.agst.ui.gantt.GanttPanel.doUpdateDocument(GanttPanel.java:1931) at com.agst.ui.gantt.GanttPanel.save(GanttPanel.java:1419) at com.agst.ui.gantt.GanttPanel$4.run(GanttPanel.java:1673) at java.lang.Thread.run(Unknown Source) Caused by: java.net.SocketException: Connection reset at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at com.agst.rmi.RemoteCallHandler.call(RemoteCallHandler.java:196) at com.agst.rmi.RemoteCallHandler.invoke(RemoteCallHandler.java:142) ... 5 more Caused by: java.net.SocketException: Connection reset at java.net.SocketInputStream.read(Unknown Source) at java.io.BufferedInputStream.fill(Unknown Source) at java.io.BufferedInputStream.read1(Unknown Source) at java.io.BufferedInputStream.read(Unknown Source) at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source) at sun.net.www.http.HttpClient.parseHTTP(Unknown Source) at sun.net.www.http.HttpClient.parseHTTP(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getHeaderFields(Unknown Source) at com.agst.rmi.RemoteCallHandler.addToCookieJar(RemoteCallHandler.java:529) at com.agst.rmi.RemoteCallHandler.call(RemoteCallHandler.java:192) ... 6 more

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  • New Java Champion: Michael Levin

    - by Tori Wieldt
    Welcome Michael Levin to Java Champion community! Michael is a JUG leader involved with Orlando, FL OrlandoJUG, the Gainesville, FL GatorJUG, the West African JUG SeneJUG and the New Orleans, LA CajunJUG. Michael is based in the USA. He is a business owner, and his business, Cambridge Web Design, Inc., specializes in custom software and Web2.0 website development (www.cambridgeweb.ie). He recently provided JCertif Java Training in Brazzaville, Republic of Congo. He also founded Codetown, an online community for software developers, located at www.codetown.us. He also has a tech podcast called Swampcast located at www.swampcast.com. You can follow him on Twitter @mikelevin.The Java Champions are an exclusive group of passionate Java technology and community leaders who are community-nominated and selected under a project sponsored by Oracle. Java Champions get the opportunity to provide feedback, ideas, and direction that will help Oracle grow the Java Platform. This interchange may be in the form of technical discussions and/or community-building activities with Oracle's Java Development and Developer Program teams.Java Champions are:    •    leaders    •    technical luminaries    •    independent-minded and credible    •    involved with some really cool applications of Java Technology or some humanitarian or educational effort    •    able to evangelize or influence other developers Congratulations to Michael on becoming the latest Java Champion!

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  • Java EE 7 Launch Replay

    - by arungupta
    Java EE 7 was released final on Jun 12, 2013. A complete replay of Strategy and Technical Keynote can be seen below: All the Technical Breakout sessions are now available on GlassFishVideos@YouTube and can be viewed in the following playlist: Ready to try out Java EE 7 ? Download Binaries Java EE 7 SDK GlassFish Server Open Source Edition 4.0 Tools NetBeans 7.3.1 Eclipse Kepler Maven Coordinates Docs Java EE 7 Whitepaper Java EE 7 Tutorial (html pdf) First Cup Sample Application Java EE 7 Hands-on Lab Javadocs (online download) Specifications All-in-one GlassFish Documentation Bundle Do you feel enabled and empowered to start building Java EE 7 applications ? Just download Java EE 7 SDK that contains GlassFish Server Open Source Edition 4.0, tutorial, samples, documentation and much more. Enjoy!

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  • Java Spotlight Episode 89: Geoff Morton on Java Embedded

    - by Roger Brinkley
    Interview with Geoff Morton, Group Vice President, Worldwide Java Sales at Oracle , on Java embedded. Joining us this week on the Java All Star Developer Panel are Dalibor Topic, Java Free and Open Source Software Ambassador and Arun Gupta, Java EE Guy. Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link:  Java Spotlight Podcast in iTunes. Show Notes News EclipseLink 2.4 Hands-on FREE GlassFish Course NetBeans IDE 7.2 RC1 Hamish Morrison: OpenJDK Haiku port: quarter term report Proposed Update to the OpenJDK Web Site Terms of Use JavaOne Embedded Oracle Java ME Embedded Client (OJEC) 1.1 release on OTN New Videos Understanding the JVM and Low Latency Applications 55 New Things in Java 7 - Concurrency Events July 5, Java Forum, Stuttgart, Germany Jul 12, Java EE 6 workshop at Mindtree, Bangalore Jul 13-14, IndicThreads, Delhi July 30-August 1, JVM Language Summit, Santa Clara Feature InterviewGeoff Morton is the Group Vice President, Worldwide Java Sales at Oracle. Mail Bag What’s Cool Duke’s Choice Awards decision is going on Java Champions Facebook Page Joe Darcy: Moving monarchs and dragons: migrating the JDK bugs to JIRA Mike Duigou: Updated Lambda Binary Drops Mark Reinhold: Mercurial "jcheck" extension now available

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  • Best Party of 2011: Introducing Java 7

    - by Tori Wieldt
    As a member of the Java community, you played a critical role in building Java 7. You contributed great ideas for new features and new ways of working and collaborating to take the next step in development. And now, it’s time to celebrate with a global gathering of the Java community—online and live. See your ideas at work. Hear about everything Java 7 can do for you and how we’re moving Java forward together. Join us for celebrations in Redwood Shores, São Paulo, or London—as we unveil the latest innovations in Java 7. The three events will be joined with each other by satellite, and will be available as a webcast if you can't attend the live events. Learn from fellow developers around the globe who are getting the most out of the new features. Get overviews from the Java experts on Project Coin, the Fork/Join framework, the new file system API, improvements to the VM, and a panel discussion with Q & A. Thursday, July 07, 2011 Redwood Shores, United States: 9:00 a.m. PT - 1:30pm PT São Paulo, Brazil: 1:00 p.m BRT London, England: 5:00 p.m. BST Live Webcast: 9:00 a.m. PT - 1:30pm PT  Get more information about the July 7 events. You need to register for the live events or webcast. There will also be other celebrations at Java User Group (JUG) meetings for the next few months.Find your local JUG. Follow the conversation on Twitter: follow @Java and use #java7 Java is moving forward, let's party!

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  • Java Magazine: Developer Tools and More

    - by Tori Wieldt
    The May/June issue of Java Magazine explores the tools and techniques that can help you bring your ideas to fruition and make you more productive. In “Seven Open Source Tools for Java Deployment,” Bruno Souza and Edson Yanaga present a set of tools that you can use now to drastically improve the deployment process on projects big or small—enabling you and your team to focus on building better and more-innovative software in a less stressful environment. We explore the future of application development tools at Oracle in our interview with Oracle’s Chris Tonas, who discusses plans for NetBeans IDE 9, Oracle’s support for Eclipse, and key trends in the software development space. For more on NetBeans IDE, don’t miss “Quick and Easy Conversion to Java SE 8 with NetBeans IDE 8” and “Build with NetBeans IDE, Deploy to Oracle Java Cloud Service.” We also give you insight into Scrum, an iterative and incremental agile process, with a tour of a development team’s Scrum sprint. Find out if Scrum will work for your team. Other article topics include mastering binaries in Maven-based projects, creating sophisticated applications with HTML5 and JSF, and learning to program with BlueJ. At the end of the day, tools don’t make great code—you do. What tools are vital to your development process? How are you innovating today? Let us know. Send a tweet to @oraclejavamag. The next big thing is always just around the corner—maybe it’s even an idea that’s percolating in *your* brain. Get started today with this issue of Java Magazine. Java Magazine is a FREE, bi-monthly, online publication. It includes technical articles on the Java language and platform; Java innovations and innovators; JUG and JCP news; Java events; links to online Java communities; and videos and multimedia demos. Subscriptions are free, registration required.

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  • Technical Article: Experimenting with Java Timers

    - by Tori Wieldt
    OTN's new tech article is "Experimenting with Java Timers" by T. Lamine Ba. This article studies time—how Java handles timers and the scheduling of tasks. Java timers are utilities that let you execute threads or tasks at a predetermined future time, and these tasks can be repeated according to a set frequency. The article starts with a simple "Hello World" program in a web application that's composed of JavaServer Pages (JSP) and uses the model-control-view (MVC) design pattern. The IDE used in this article is NetBeans IDE 7.1, but you can use any IDE that supports Java. "Experimenting with Java Timers" demonstrates how to get started scheduling jobs with Java. To learn about Swing timers, check out the Java tutorial "How to Use Swing Timers" and additional information in the Java Platform, Standard Edition 7 API Specification for Class Timer. 

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  • Java Magazine????5???

    - by sasa
    Java Magazine????5?????????????Java Magazine???????????????????????????????????? ?5????????????????Java Embedded????????? ????·???????? ????????? ??????? NetBeans?????Wicket 1.4??Web?????????? OPENJDK:?????? Java SE 7: ???????????????????????? JDK 7????Java DB???? OpenJDK??????Java?????????? Java HotSpot VM????JIT???????? JAVAFX2.0 ???????????????????? ???????????????? Java EE 6???????????? JavaFX????????? ??????????????????????????????????????????

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  • Issues using SoapUI with Eclipse

    - by Epitaph
    I get the following in the Error log when using the latest SoapUI 3.5. plugin in Eclipse Galileo on Ubuntu. Also, this seems to continually freeze Eclipse. I have tried a complete uninstall and restarting Eclipse with -clean argument to no avail. Has anyone encountered the same issue? Is there anything I can do to fix this? Could not acquire children from extension: com.eviware.soapui.eclipse.projectContent for Plugin org.eclipse.ui.navigator java.lang.NullPointerException at org.eclipse.ui.internal.navigator.NavigatorContentService.rememberContribution(NavigatorContentService.java:686) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getElements(SafeDelegateTreeContentProvider.java:97) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.getElements(NavigatorContentServiceContentProvider.java:156) at org.eclipse.jface.viewers.StructuredViewer.getRawChildren(StructuredViewer.java:959) at org.eclipse.jface.viewers.ColumnViewer.getRawChildren(ColumnViewer.java:703) at org.eclipse.jface.viewers.AbstractTreeViewer.getRawChildren(AbstractTreeViewer.java:1330) at org.eclipse.jface.viewers.TreeViewer.getRawChildren(TreeViewer.java:390) at org.eclipse.jface.viewers.AbstractTreeViewer.getFilteredChildren(AbstractTreeViewer.java:636) at org.eclipse.jface.viewers.AbstractTreeViewer.getSortedChildren(AbstractTreeViewer.java:602) at org.eclipse.jface.viewers.AbstractTreeViewer.updateChildren(AbstractTreeViewer.java:2578) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefreshStruct(AbstractTreeViewer.java:1863) at org.eclipse.jface.viewers.TreeViewer.internalRefreshStruct(TreeViewer.java:716) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1838) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1794) at org.eclipse.ui.navigator.CommonViewer.internalRefresh(CommonViewer.java:566) at org.eclipse.jface.viewers.StructuredViewer$8.run(StructuredViewer.java:1484) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1392) at org.eclipse.jface.viewers.TreeViewer.preservingSelection(TreeViewer.java:402) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1353) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1482) at org.eclipse.jface.viewers.ColumnViewer.refresh(ColumnViewer.java:548) at org.eclipse.ui.navigator.CommonViewer.refresh(CommonViewer.java:358) at org.eclipse.ui.navigator.CommonViewer.refresh(CommonViewer.java:515) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1414) at org.eclipse.jface.viewers.StructuredViewer.addFilter(StructuredViewer.java:582) at org.eclipse.ui.internal.navigator.resources.actions.WorkingSetActionProvider.setWorkingSet(WorkingSetActionProvider.java:280) at org.eclipse.ui.internal.navigator.resources.actions.WorkingSetActionProvider$3.propertyChange(WorkingSetActionProvider.java:226) at org.eclipse.ui.internal.navigator.extensions.ExtensionStateModel.firePropertyChangeEvent(ExtensionStateModel.java:135) at org.eclipse.ui.internal.navigator.extensions.ExtensionStateModel.setBooleanProperty(ExtensionStateModel.java:90) at org.eclipse.ui.internal.navigator.resources.actions.WorkingSetActionProvider.restoreState(WorkingSetActionProvider.java:318) at org.eclipse.ui.navigator.NavigatorActionService.initialize(NavigatorActionService.java:372) at org.eclipse.ui.navigator.NavigatorActionService.getActionProviderInstance(NavigatorActionService.java:355) at org.eclipse.ui.navigator.NavigatorActionService.fillActionBars(NavigatorActionService.java:253) at org.eclipse.ui.navigator.CommonNavigatorManager.selectionChanged(CommonNavigatorManager.java:239) at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:162) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.runtime.Platform.run(Platform.java:888) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:160) at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:2132) at org.eclipse.jface.viewers.StructuredViewer.setSelection(StructuredViewer.java:1669) at org.eclipse.jface.viewers.TreeViewer.setSelection(TreeViewer.java:1124) at org.eclipse.ui.navigator.CommonViewer.setSelection(CommonViewer.java:380) at org.eclipse.ui.navigator.CommonNavigator.selectReveal(CommonNavigator.java:362) at org.eclipse.ui.internal.navigator.actions.LinkEditorAction$3.run(LinkEditorAction.java:101) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.navigator.actions.LinkEditorAction$2.runInUIThread(LinkEditorAction.java:89) at org.eclipse.ui.progress.UIJob$1.run(UIJob.java:95) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3468) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3115) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514) at org.eclipse.equinox.launcher.Main.run(Main.java:1311)

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  • Developer Preview available for the Java Access Bridge is now included in Java SE 7 Update 6

    - by Ragini Prasad
    The Java Access Bridge product is now being included with Java SE 7u6. Manual installation of the Java Access Bridge will no longer be required. All Access Bridge files will be automatically installed by the JRE and the JDK.             The Developer Preview for this feature is now available and can be downloaded from http://jdk7.java.net/download.html.            By default, the Java Access Bridge is disabled. In order to use the Java Access Bridge, enable it using the steps mentioned below and test your applications for accessibility.             Enable the Java Access Bridge: Use one of these mechanism:             1. Ease Of Access control panel.     On Windows Vista and later the Java Access Bridge can be enabled     from Ease of Access Center.     Select "Use the computer without a display". In "Other programs     installed" section , select the check box to     "Enable Java Access Bridge" and apply. 2. Or run the following command in the Command Window.     %JRE_HOME%\bin\jabswitch -enable Note: You must restart your Assistive Technology software and Java application after enabling the bridge.             Test the Java Access Bridge: 1. Enable the Java Access Bridge as described above. 2. Run an Assistive Technology that supports the Java Access Bridge. 3. Run a Java application. Ensure that the Assistive Technology  reads    the values of your application. Disable the Java Access Bridge:             Run the following command from the Command Window.     %JRE_HOME%\bin\jabswitch -disable                 Note: The Ease Of Access control panel cannot be used to disable the bridge. You must use jabswitch from the Command window to disable the Java Access Bridge.

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  • Java RMI AccessControlException: access denied

    - by Gwilym
    Hey im getting a AccessControlException: access denied when attempting to start up a RMI app im writing, I cant work out why I get this exception if I open it on the default port 1099, or on another dynamic port, my policy file currently grants everything (will change when app is finished). I am stuck as to where It is going wrong, any help would but of great use My code public class Main { /** * @param args the command line arguments */ public static void main(String[] args) throws RemoteException, AlreadyBoundException, MalformedURLException { if (System.getSecurityManager() == null) { System.setSecurityManager ( new RMISecurityManager() ); } CreditCardServer ccs = new CreditCardServer(); int port = 1099; try { port = Integer.valueOf(args[0]); } catch (Exception e) { System.out.println("Invlaid Port"); } if (((port <= 65535) && (port >= 49152)) || port ==1099) { System.out.println("Valid Port"); } else { port = 1099; System.out.println("Port not in Dynamic Range 49152<-->65535"); } System.out.println(port); LocateRegistry.createRegistry(port); LocateRegistry.getRegistry().bind("CreditCardServer", ccs); while (true) { //hum? } } } The Stack Trace vega3 [ia32.linux] 23% java -Djava.security.policy=wideopen.policy -jar "BookStore-CreditCardServer.jar 65000" Valid Port 65000 Exception in thread "main" java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:1099 connect,resolve) at java.security.AccessControlContext.checkPermission(AccessControlContext.java:342) at java.security.AccessController.checkPermission(AccessController.java:553) at java.lang.SecurityManager.checkPermission(SecurityManager.java:549) at java.lang.SecurityManager.checkConnect(SecurityManager.java:1051) at java.net.Socket.connect(Socket.java:536) at java.net.Socket.connect(Socket.java:492) at java.net.Socket.<init>(Socket.java:389) at java.net.Socket.<init>(Socket.java:203) at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40) at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:146) at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613) at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216) at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202) at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:340) at sun.rmi.registry.RegistryImpl_Stub.bind(Unknown Source) at bookstorecreditcardserver.Main.main(Main.java:56) My Policy File grant { // Allow everything for now permission java.security.AllPermission; };

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  • Java problem: Could not find main class HelloWorld

    - by Newbie
    I am new to java(a real novice). I installed Java 1.7.0 in the following folder C:\Program Files\Java The environment variable which I set are CLASSPATH : C:\Program Files\Java\jdk1.7.0\jre\lib\rt.jar; Path : C:\Program Files\Java\jdk1.7.0\bin; JAVA_HOME : C:\Program Files\Java; I have presented here the class names which are in my system. Next I wrote a program(HelloWorld.java) import java.io.*; class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } } When I am compiling using javac HelloWorld.java it is compiling fine. But after I issue java HelloWorld I am encountering the below error Error: Could not find main class HelloWorld Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:198) Caused by: java.lang.ClassNotFoundException: HelloWorld at java.net.URLClassLoader$1.run(URLClassLoader.java:299) at java.net.URLClassLoader$1.run(URLClassLoader.java:288) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:287) at java.lang.ClassLoader.loadClass(ClassLoader.java:422) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:325) at java.lang.ClassLoader.loadClass(ClassLoader.java:355) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:195) After a bit of google search I found that may be something wrong in the environment variable. I tried to play with that but no luck. I know that it may be a very simple thing for the real java developers(actually basic) but for me as of now no luck! I even RESTARTED the machine and then again I tried to run but with same fate. OS: Windows XP(Version 2002) with Service pack 3 Help needed . Thanks .

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  • Java UnknownHostException When and Why?

    - by interstar
    I'm trying to post to a website from a Processing Sketch. (Processing is basically Java running in a fancy environment). I'm using this library : http://libraries.seltar.org/postToWeb/ but I don't know if that makes a difference. You can see from the stack trace below that this is just a wrapper for the Java standard library. Anyway, the important point is that the host "mysite.com" is up and running. I am seeing it from the browser. But when I try to post to it from Java I just get the UnknownHostException appearing. Given that the site is up. What else might this mean? The program is currently running inside the Processing environment. Presumably as an Applet. java.net.UnknownHostException: mysite.com at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:195) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366) at java.net.Socket.connect(Socket.java:529) at java.net.Socket.connect(Socket.java:478) at sun.net.NetworkClient.doConnect(NetworkClient.java:163) at sun.net.www.http.HttpClient.openServer(HttpClient.java:394) at sun.net.www.http.HttpClient.openServer(HttpClient.java:529) at sun.net.www.http.HttpClient.<init>(HttpClient.java:233) at sun.net.www.http.HttpClient.New(HttpClient.java:306) at sun.net.www.http.HttpClient.New(HttpClient.java:323) at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:970) at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:911) at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:836) at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1014) at org.seltar.Bytes2Web.PostToWeb._post(PostToWeb.java:90) at org.seltar.Bytes2Web.ByteToWeb.post(ByteToWeb.java:66) at experimentPostToWeb.keyPressed(experimentPostToWeb.java:35) at processing.core.PApplet.handleKeyEvent(Unknown Source) at processing.core.PApplet.dequeueKeyEvents(Unknown Source) at processing.core.PApplet.handleDraw(Unknown Source) at processing.core.PApplet.run(Unknown Source) at java.lang.Thread.run(Thread.java:662)

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  • Is there a recommended order to take the Oracle Java EE certification exams?

    - by Karl
    I recently passed the Oracle Certified Professional, Java SE 6 Programmer examination. Now, my boss would like me to take "the next step" to broaden my competence. I tried to explain that there is no equivalent Java EE 6 Programmer examination, but a number of different exams, such as Web Services, Web Components, and Enterprise JavaBeans. Is there a recommended path to follow for the various Oracle certifications in the Enterprise Edition of Java? Is it logical to take some exams prior to taking others because the content builds upon previous knowledge or are they all independent?

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  • "MOZILLA_FIVE_HOME not set" zekr quran study software java error

    - by Acess Denied
    I have installed zekr Quran study software on ubuntu 12.04 and I upgraded to 12.10. then the zekr app has been giving me this error when ever I start it. org.eclipse.swt.SWTError: No more handles [Unknown Mozilla path (MOZILLA_FIVE_HOME not set)] at org.eclipse.swt.SWT.error(SWT.java:4387) at org.eclipse.swt.browser.Mozilla.initMozilla(Mozilla.java:1939) at org.eclipse.swt.browser.Mozilla.create(Mozilla.java:699) at org.eclipse.swt.browser.Browser.<init>(Browser.java:99) at net.sf.zekr.ui.QuranForm.makeFrame(QuranForm.java:628) at net.sf.zekr.ui.QuranForm.init(QuranForm.java:340) at net.sf.zekr.ui.QuranForm.<init>(QuranForm.java:319) at net.sf.zekr.ZekrMain.startZekr(ZekrMain.java:51) at net.sf.zekr.ZekrMain.main(ZekrMain.java:94) Please Advice me

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  • ???? “Java?”???????? ?Java???????????!--Java Day Tokyo 2013????

    - by ???Y
    2013?5?14????????Java Day Tokyo 2013?????????????????????1????????Java??????????????JavaOne???????????????????????????Java????????????????????????????????????????????????????????????????????????????????????(????) JavaOne?????????Java Day Tokyo 2013??? ??????Java?????????Java????????(JJUG)??????????????????????????????JJUG????????????????????????????????????????????????????????????????? ???????????????(?????) ???????????????????????????????4???????????????????????"Java SE 8"???????????????????????????????????????????????????? ??????????????????????????????????????2???????????? ???BigDecimal?????equals????????? 1???????BigDecimal?????equals???????????????????????????????????(equity)???(liabilities)?????????(asset)??????1???????????????? ????????Java SE 8???????????????????????????????????????????2??????????????????????????????????????????????????????????????????????????????????????????????????????????0???1???2?????????????? ?????????????BigDecimal???????????????????????????"100"???????????????????????100.00??????????????????????"10000"?????????????????10000????? ??????????BigDecimal?????equals?????????????????????????????2??????????????"10000"??????10000?????????????1???????????"100"???100.00??????????????????? ????????????????equals?????????2???????????????????????????????????????1??????????????????????compareTo???????????????????????????? switch????????? ??????HTML???HTML5????????????????Map?????<Progress>???<tt>???<applet>????3???????????????(new=?????deprecated=????removed=??)???????????switch??????????????????????????????????? ????????????????????????(????applet)?????????????????????????????decorate????????????????????????StringBuilder?????????????????????????? ??????????????????"<applet>?HTML5?????????"??????????????????????????????????????????4????? ???????????????????? ????????????????????????switch???case?break??????????????????????????????????"<applet>?HTML5?????????"???????????????????? ???????????????????????????????????switch??????????????????????????Java SE 6???switch????????????????????????Java SE 7?????????????????????????????????????????? ?????????????????? ????????????????????????????????????????????decorate??????????StringBuilder?????????????????????????????char???????(<)??????????????StringBuilder?????????char????????????????????????????????????????????int???99????????????? ????????????????????????append???????????name???(applet)??>?????????????????????????applet>????????? ????????????Map?status??<applet>???????applet>???????????switch??????status.get(key)????????????status?????null??????????? ???????"??"?????Java?????switch???????null????????NullPointerException??????????? ????????????????????????????????????? ????char?????????????????????????????(IDE)??????????????????????????????????????switch?????????????null????????????????????? ???????2???????????????????Java????·?????????????????????????????????????????????????????????????????????????

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  • Java Spotlight Episode 35: JVM Performance and Quality

    - by Roger Brinkley
    Tweet Interview with Vladimir Ivanov, Ivan Krylov, Sergey Kuksenko on the JDK 7 Java Virtual Machine performance and quality. Joining us this week on the Java All Star Developer Panel are Dalibor Topic, Java Free and Open Source Software Ambassador, and Alexis Moussine-Pouchkine, Java EE Developer Advocate. Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link: Java Spotlight Podcast in iTunes. Show Notes News Java 7 Launch Event GlassFish 3.1.1 re-planning done, first RC on July 7th, lots of component updates following customer and community feedback Mojarra 2.1.2 is here, just a little ahead of the GlassFish 3.1.1 release. In other JSF-related news, JSF 2.0 has a first expert draft New OpenJDK Project proposed: JDK 7 Update Events June 20-23 JAX, San Jose, CA June 21 Java + MySQL Webinar at 9:00 AM PDT June 21-23 JaZoon, Zurich, Switzerland June 22nd and 28th GlassFish Webinars (one in Portuguese) June 29-July 2 12th Forum Internatioal Software Livre, Porto Alegre, Brazil July 3, Sao Jose do Rio Preto, Brazil July 5, Brasilia, Brazil (DFJUG) July 6, Goiania, Brazil (GOJava) July 6-10 The Developers Conference, Sao Paulo, Brazil July 7 Java 7 Launch Event live in Redwood Shores, CA; Sao Paulo, BR; London, England. July 9, Joao Pessoa, Brazil (PBJUG) July 11, Natal, Brazil (JavaRN) July 14, Fortaleza, Brazil (CEJUG) July 16, Salvador, Brazil (JavaBahia) July 19, Toledo, Brazil (UNIPAR) July 21, Maringa, Brazil (RedFoot) Feature interview This weeks feature interview is with Vladimir Ivanov, HotSpot JVM Quality Engingeer;  Ivan Krylov, Licensee Engineering;  and Sergey Kuksenko, Java SE Performance Team on the JDK 7 Java Virtual Machine peformance and quality. What's Cool Ongoing OpenJDK Bylaws ratification results Show Transcripts Transcript for this show is available here when available

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  • Java language book for an experienced programmer?

    - by Andrew
    I am looking for book to get up to speed with (start with) a Java language. I am experienced (more than 15 years) C# and C++ programmer with a bit of Python, so I don't need a book which starts with a programming concepts for a beginner. In fact I think I need a "Java language specification" sort of book. I checked the answers to questions similar to mine and found that there two books which is being recommended most: "Effective Java" and "Sun Certified Java Programmer". After a quick look at the "Effective Java" I realised it should not be a book to start with, it is a good book (I read all books in Effective C++, STL series and liked them but they are more "good practices" books, rather than a book for a beginners) "Sun Certified Java Programmer" looks closer to what I am after - but goes too slow for me. So I did some more search and found these two books: The Java(TM) Language Specification by Gosling himself Java™ Programming Language, The (4th Edition) by Ken Arnold I gather the first one a little bit dated and the second one is the best Java Language Reference books up to date, but I am not sure - as I am not a Java person to make such judgements. After reading the language reference book I will start learning the basic libraries / packages / namespaces (collections, algorithms, IO, etc) and then something about UI architecture. But that will come later. Question: - which Java Language reference book for an experienced programmer you can recomend ? and why? Cheers.

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  • Java Components Landing Page and Documentation Updates

    - by joni g.
    The new Java Components page provides access to the documentation for tools that are available for monitoring, managing, and testing Java applications. Documentation for the new versions of the following tools is available: JavaTest Harness 4.6. The JavaTest harness is a general purpose, fully-featured, flexible, and configurable test harness that is suited for most types of unit testing. See the JavaTest tab for documentation. SigTest 3.1. SigTest is a collection of tools that can be used to compare APIs and to measure the test coverage of an API. See the SigTest tab for documentation. The following tools are part of Oracle Java SE Advanced and Oracle Java SE Suite. Java Mission Control and Java Flight Control 5.4 are supported in JDK 8u20. Java Flight Recorder and Java Mission Control together create a complete tool chain to continuously collect low level and detailed runtime information enabling after-the-fact incident analysis. See the JMC tab for documentation. Advanced Management Console 1.0 is a new tool that is now available. AMC can be used to view information about the Java applets and Java Web Start applications running in your enterprise, and create deployment rules and rule sets to manage the execution of these applications. See the AMC tab for documentation. Usage Tracker tracks how Java Runtime Environments (JREs) are being used in your systems. See the Usage Tracker tab for documentation.

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