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  • What happens if we serialize and deserialize two objects which references to each other?

    - by Seregwethrin
    To make it more clear, this is a quick example: class A implements Serializable { public B b; } class B implements Serializable { public A a; } A a = new A(); B b = new B(); a.b = b; b.a = a; So what happens if we serialize a and b objects into a file and deserialize from that file? I thought we get 4 objects, 2 of each. Identical objects but different instances. But I'm not sure if there's anything else or is it right or wrong. If any technology needed to answer, please think based on Java. Thank you.

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  • How do you set the movement speed of a sprite?

    - by rphello101
    I'm using Slick 2D/Java to play around with graphics. Getting an image to move is easy: Input input = gc.getInput(); if(input.isKeyDown(sprite.up)){ sprite.y--; }else if (input.isKeyDown(sprite.down)){ sprite.y++; }else if (input.isKeyDown(sprite.left)){ sprite.x--; }else if (input.isKeyDown(sprite.right)){ sprite.x++; } However, this is called on every update, so if you hold up, the sprite moves to the edge of the screen in a few hundred milliseconds. Since coordinates are integers, I can't add less than 1 to slow the sprite down. I'm assuming I must have to implement a timer of some sort or something. Any advice?

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  • Matrix camera, movement concept

    - by NoFace
    I was talking to some guy. He said that my movement concept in game is bad. When left or right arrow is pressed I'm scrolling background what makes you feel that player is moving (player's X remains same). So... he told me something about matrix view. I should create all walls and platforms static and scroll only the camera and move player's rectangle. I did a little research in Google, but nothing found. Can you tell me anything about it? How to start? Maybe links, books and resources? My programming language is Java (2d). Thank you!

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  • Is there a language that allows this syntax: add(elements)at(index);

    - by c_maker
    Does a language exist with such a syntax? If not, what are some of the limitations/disadvantages to this syntax in case I want to write a language that supported it? Some examples: sort(array, fromIndex, toIndex); vs sort(array)from(index1)to(index2); Method signature would like this: sort(SomeType[] arr)from(int begin)to(int end){ ... } Update: Because there might be some confusion, I'd like to clarify... I meant this question as a general idea like this (not specific to sorting and possibly using keywords like from and to): In JAVA(like language): void myfancymethod(int arg1, String arg2){ ... } myfancymethod(1, "foo"); In imaginary language: void my(int arg1)fancy(String arg2)method{ ... } my(1)fancy("foo")method;

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  • Cost vs. Fun - Dilemma about learning a serverside language [closed]

    - by Ixx
    I want to learn a new server-side language. I already know Java. I'm fascinated by Scala, have read about it a lot, and want to get practical experience. But I also have some concerns of practical nature - I want to do the backend for many small, non-profit apps, and pay the lowest price for hosting possible. I also want that other people can easily contribute to these apps, if applicable. This leads me in PHP's direction. But I don't like PHP and would like to use these small projects to learn Scala instead. You see the problem, I don't want to pay more money each month, from my own pocket, for hosting. But I want to use these projects to learn Scala. Is there a practical solution for this?

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  • how to enrich my programming background? [on hold]

    - by city
    I am not sure whether I post my question in right place. I am a master student in computer science and I will graduate next year.Recently, I failed in an interview. Because (at least I think) the interviewer did not think my background strong enough although I finished 5 courses projects and currently working on other 2 projects in graduate school. It seems that nowadays, recruiters like these candidates who finish some projects out of school/work. So I wanna enrich my background. So, I hope you guys recommend some java/C++ projects to me, which I can finish in two or three months. And it would be better if concurrency programming or other fancy skills are needed.

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  • how to create multiple pages in Xcode iphone apps

    - by al7r
    Hi there, i am starting my experience with iphone sdk. and i have a question, which is i am trying to create two pages to the app but i don't know how to link them or design them. like when i start the Xcode i find one page named View to design in it, i want to make that page a welcoming page then the user choose one of the three choices he see in that page. Once he clicked on one of them the program take him to the next page or the page he chose. thank you

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  • Custom JComponent not displaying in Custom JPanel

    - by Trizicus
    I've tried the add() method but nothing is displayed when I try to add Test to GraphicsTest. How should I be adding it? Can someone show me? I've included the code I'm using. import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import javax.swing.JComponent; public class Test extends JComponent { Test() { setOpaque(false); setBackground(Color.white); } @Override public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g.create(); g2d.setColor(Color.red); g2d.drawString("Hello", 50, 50); g2d.dispose(); } } import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.geom.Rectangle2D; import javax.swing.JPanel; public class GraphicsTest extends JPanel implements MouseListener { private Graphics2D g2d; private String state; private int x, y; GraphicsTest() { add(new Test()); } @Override public void paintComponent(Graphics g) { super.paintComponent(g); g2d = (Graphics2D) g; g2d.setColor(Color.BLACK); g2d.drawString("STATE: " + state, 5, 15); g2d.drawString("Mouse Position: " + x + ", " + y, 5, 30); g2d.setColor(Color.red); Rectangle2D r2d = new Rectangle2D.Double(x, y, 10, 10); g2d.draw(r2d); g2d.dispose(); } public void setState(String state) { this.state = state; } public String getState() { return state; } public void setX(int x) { this.x = x; repaint(); } public void setY(int y) { this.y = y; repaint(); } public void mouseClicked(MouseEvent e) {} public void mousePressed(MouseEvent e) {} public void mouseReleased(MouseEvent e) {} public void mouseEntered(MouseEvent e) {} public void mouseExited(MouseEvent e) {} }

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  • Memory Leak Issue in Weblogic, SUN, Apache and Oracle classes Options

    - by Amit
    Hi All, Please find below the description of memory leaks issues. Statistics show major growth in the perm area (static classes). Flows were ran for 8 hours , Heap dump was taken after 2 hours and at the end. A growth in Perm area was identified Statistics show from our last run 240MB growth in 6 hour,40mb growth every hour 2GB heap –can hold ¾ days ,heap will be full in ¾ days Heap dump show –growth in area as mentioned below JMS connection/session Area Apache org.apache.xml.dtm.DTM[] org.apache.xml.dtm.ref.ExpandedNameTable$ExtendedType org.jdom.AttributeList org.jdom.Content[] org.jdom.ContentList org.jdom.Element SUN * ConstantPoolCacheKlass * ConstantPoolKlass * ConstMethodKlass * MethodDataKlass * MethodKlass * SymbolKlass byte[] char[] com.sun.org.apache.xml.internal.dtm.DTM[] com.sun.org.apache.xml.internal.dtm.ref.ExtendedType java.beans.PropertyDescriptor java.lang.Class java.lang.Long java.lang.ref.WeakReference java.lang.ref.SoftReference java.lang.String java.text.Format[] java.util.concurrent.ConcurrentHashMap$Segment java.util.LinkedList$Entry Weblogic com.bea.console.cvo.ConsoleValueObject$PropertyInfo com.bea.jsptools.tree.TreeNode com.bea.netuix.servlets.controls.content.StrutsContent com.bea.netuix.servlets.controls.layout.FlowLayout com.bea.netuix.servlets.controls.layout.GridLayout com.bea.netuix.servlets.controls.layout.Placeholder com.bea.netuix.servlets.controls.page.Book com.bea.netuix.servlets.controls.window.Window[] com.bea.netuix.servlets.controls.window.WindowMode javax.management.modelmbean.ModelMBeanAttributeInfo weblogic.apache.xerces.parsers.SecurityConfiguration weblogic.apache.xerces.util.AugmentationsImpl weblogic.apache.xerces.util.AugmentationsImpl$SmallContainer weblogic.apache.xerces.util.SymbolTable$Entry weblogic.apache.xerces.util.XMLAttributesImpl$Attribute weblogic.apache.xerces.xni.QName weblogic.apache.xerces.xni.QName[] weblogic.ejb.container.cache.CacheKey weblogic.ejb20.manager.SimpleKey weblogic.jdbc.common.internal.ConnectionEnv weblogic.jdbc.common.internal.StatementCacheKey weblogic.jms.common.Item weblogic.jms.common.JMSID weblogic.jms.frontend.FEConnection weblogic.logging.MessageLogger$1 weblogic.logging.WLLogRecord weblogic.rjvm.BubblingAbbrever$BubblingAbbreverEntry weblogic.rjvm.ClassTableEntry weblogic.rjvm.JVMID weblogic.rmi.cluster.ClusterableRemoteRef weblogic.rmi.internal.CollocatedRemoteRef weblogic.rmi.internal.PhantomRef weblogic.rmi.spi.ServiceContext[] weblogic.security.acl.internal.AuthenticatedSubject weblogic.security.acl.internal.AuthenticatedSubject$SealableSet weblogic.servlet.internal.ServletRuntimeMBeanImpl weblogic.transaction.internal.XidImpl weblogic.utils.collections.ConcurrentHashMap$Entry Oracle XA Transaction oracle.jdbc.driver.Binder[] oracle.jdbc.driver.OracleDatabaseMetaData oracle.jdbc.driver.T4C7Ocommoncall oracle.jdbc.driver.T4C7Oversion oracle.jdbc.driver.T4C8Oall oracle.jdbc.driver.T4C8Oclose oracle.jdbc.driver.T4C8TTIBfile oracle.jdbc.driver.T4C8TTIBlob oracle.jdbc.driver.T4C8TTIClob oracle.jdbc.driver.T4C8TTIdty oracle.jdbc.driver.T4C8TTILobd oracle.jdbc.driver.T4C8TTIpro oracle.jdbc.driver.T4C8TTIrxh oracle.jdbc.driver.T4C8TTIuds oracle.jdbc.driver.T4CCallableStatement oracle.jdbc.driver.T4CClobAccessor oracle.jdbc.driver.T4CConnection oracle.jdbc.driver.T4CMAREngine oracle.jdbc.driver.T4CNumberAccessor oracle.jdbc.driver.T4CPreparedStatement oracle.jdbc.driver.T4CTTIdcb oracle.jdbc.driver.T4CTTIk2rpc oracle.jdbc.driver.T4CTTIoac oracle.jdbc.driver.T4CTTIoac[] oracle.jdbc.driver.T4CTTIoauthenticate oracle.jdbc.driver.T4CTTIokeyval oracle.jdbc.driver.T4CTTIoscid oracle.jdbc.driver.T4CTTIoses oracle.jdbc.driver.T4CTTIOtxen oracle.jdbc.driver.T4CTTIOtxse oracle.jdbc.driver.T4CTTIsto oracle.jdbc.driver.T4CXAConnection oracle.jdbc.driver.T4CXAResource oracle.jdbc.oracore.OracleTypeADT[] oracle.jdbc.xa.OracleXAResource$XidListEntry oracle.net.ano.Ano oracle.net.ns.ClientProfile oracle.net.ns.ClientProfile oracle.net.ns.NetInputStream oracle.net.ns.NetOutputStream oracle.net.ns.SessionAtts oracle.net.nt.ConnOption oracle.net.nt.ConnStrategy oracle.net.resolver.AddrResolution oracle.sql.CharacterSet1Byte we are using Oracle BEA Weblogic 9.2 MP3 JDK 1.5.12 Oracle versoin 10.2.0.4 (for oracle we found one path which is needed to applied to avoid XA transaction memory leaks). But we are stuck to resolve SUN, BEA Weblgogic and Apache leaks. please suggest... regards, Amit J.

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  • Error while using PowerMockito.whenNew()

    - by Ankush
    I am using PowerMockito(1.3.6) with Mockito(1.8.3) and Junit(4.7) for testing. I am quite stuck on an error: [junit] Testcase: testNextPNRFromQueueHappyPath(com.orbitz.galileo.host.robot.GalpoQueueConnectionTest): Caused an ERROR [junit] org/mockito/internal/IMockHandler [junit] java.lang.NoClassDefFoundError: org/mockito/internal/IMockHandler [junit] at org.powermock.api.mockito.internal.expectation.DefaultConstructorExpectationSetup.createNewSubsituteMock(DefaultConstructorExpectationSetup.java:80) [junit] at org.powermock.api.mockito.internal.expectation.DefaultConstructorExpectationSetup.withArguments(DefaultConstructorExpectationSetup.java:48) [junit] at com.orbitz.galileo.host.robot.GalpoQueueConnectionTest.testNextPNRFromQueueHappyPath(GalpoQueueConnectionTest.java:62) [junit] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [junit] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [junit] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) My class under test : GalpoQueueConnection is basically creating a new object of another class : QueueReadBuilder. I am trying to do something like: @RunWith(PowerMockRunner.class) @PrepareForTest({GalpoQueueConnection.class, ApolloProcUtils.class}) public class GalpoQueueConnectionTest extends TestCase{ @Test public void testNextPNRFromQueueHappyPath() throws Exception { QueueReadBuilder mockBuilder = mock(QueueReadBuilder.class); PowerMockito.whenNew(QueueReadBuilder.class).withArguments(anyString(), anyString(), anyString()).thenReturn(mockBuilder); } } It seems like somehow powermockito is trying to call IMockHandler, and I looked at Mockito 1.8.3 api, and there isn't any. Any suggestions/ clues would be welcome.

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  • Problem in Eclipse 3.5 and ubuntu 9.10

    - by ki0
    Someone knows why eclipse close when i click any button. This is because when i try to do something, update eclipse or whatever, eclipse close and it gives me this log... # # A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x00007fc329864f7a, pid=9392, tid=140476827293968 # # JRE version: 6.0_16-b01 # Java VM: Java HotSpot(TM) 64-Bit Server VM (14.2-b01 mixed mode linux-amd64 ) # Problematic frame: # C [libpango-1.0.so.0+0x24f7a] pango_layout_new+0x2a # # If you would like to submit a bug report, please visit: # http://java.sun.com/webapps/bugreport/crash.jsp # The crash happened outside the Java Virtual Machine in native code. # See problematic frame for where to report the bug. # I think it is something about java, anyone has any solution?¿ Thanks

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  • Eclipse Error On Startup

    - by GuyNoir
    Eclipse was running fine last night, but this morning I tried starting it up and I came upon this error: Here's the log !SESSION 2010-04-07 17:58:37.208 ----------------------------------------------- eclipse.buildId=I20080617-2000 java.version=1.6.0_13 java.vendor=Sun Microsystems Inc. BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US Command-line arguments: -os win32 -ws win32 -arch x86 !ENTRY org.eclipse.osgi 4 0 2010-04-07 17:58:37.457 !MESSAGE Startup error !STACK 1 java.lang.NumberFormatException: For input string: "" at java.lang.NumberFormatException.forInputString(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at org.eclipse.osgi.storagemanager.StorageManager.updateTable(StorageManager.java:512) at org.eclipse.osgi.storagemanager.StorageManager.open(StorageManager.java:694) at org.eclipse.osgi.internal.baseadaptor.BaseStorage.initFileManager(BaseStorage.java:208) at org.eclipse.osgi.internal.baseadaptor.BaseStorage.initialize(BaseStorage.java:142) at org.eclipse.osgi.baseadaptor.BaseAdaptor.initializeStorage(BaseAdaptor.java:124) at org.eclipse.osgi.framework.internal.core.Framework.initialize(Framework.java:180) at org.eclipse.osgi.framework.internal.core.Framework.<init>(Framework.java:152) at org.eclipse.osgi.framework.internal.core.OSGi.createFramework(OSGi.java:90) at org.eclipse.osgi.framework.internal.core.OSGi.<init>(OSGi.java:31) at org.eclipse.core.runtime.adaptor.EclipseStarter.startup(EclipseStarter.java:286) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:175) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504) at org.eclipse.equinox.launcher.Main.run(Main.java:1236) Any help? I really need this up and running, and reinstalling and resetting all of my plugins and settings just isn't an option at the moment.

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  • Activity has leaked window that was originally added

    - by Pentium10
    What's this error, why happens? 05-17 18:24:57.069: ERROR/WindowManager(18850): Activity com.mypkg.myP has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44c46ff0 that was originally added here 05-17 18:24:57.069: ERROR/WindowManager(18850): android.view.WindowLeaked: Activity ccom.mypkg.myP has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44c46ff0 that was originally added here 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.view.ViewRoot.<init>(ViewRoot.java:231) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.view.Window$LocalWindowManager.addView(Window.java:424) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.Dialog.show(Dialog.java:239) 05-17 18:24:57.069: ERROR/WindowManager(18850): at com.mypkg.myP$PreparePairingLinkageData.onPreExecute(viewP.java:183) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.os.AsyncTask.execute(AsyncTask.java:391) 05-17 18:24:57.069: ERROR/WindowManager(18850): at com.mypkg.myP.onCreate(viewP.java:94) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2544) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2621) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.ActivityThread.access$2200(ActivityThread.java:126) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1932) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.os.Handler.dispatchMessage(Handler.java:99) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.os.Looper.loop(Looper.java:123) 05-17 18:24:57.069: ERROR/WindowManager(18850): at android.app.ActivityThread.main(ActivityThread.java:4595) 05-17 18:24:57.069: ERROR/WindowManager(18850): at java.lang.reflect.Method.invokeNative(Native Method) 05-17 18:24:57.069: ERROR/WindowManager(18850): at java.lang.reflect.Method.invoke(Method.java:521) 05-17 18:24:57.069: ERROR/WindowManager(18850): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 05-17 18:24:57.069: ERROR/WindowManager(18850): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 05-17 18:24:57.069: ERROR/WindowManager(18850): at dalvik.system.NativeStart.main(Native Method)

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  • Packaging ejb3 swing client

    - by soontobeared
    Hi, I get the "java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFac tory" error while running my packaged ejb3 swing client jar. Here's the stack trace. G:\Courses\OSUMC\Installables\June 5\New>java -jar MetaDB-Client.jar javax.naming.NoInitialContextException: Cannot instantiate class: org.jnp.interf aces.NamingContextFactory [Root exception is java.lang.ClassNotFoundException: o rg.jnp.interfaces.NamingContextFactory] at javax.naming.spi.NamingManager.getInitialContext(Unknown Source) at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source) at javax.naming.InitialContext.init(Unknown Source) at javax.naming.InitialContext.<init>(Unknown Source) at net.massmatrix.metadb.ui.facade.BaseEJBFacade.getInitialContext(BaseE JBFacade.java:26) at net.massmatrix.metadb.ui.facade.UserManagerFacade.getUserManager(User ManagerFacade.java:24) at net.massmatrix.metadb.ui.facade.UserManagerFacade.isUserNameAvailable (UserManagerFacade.java:44) at net.massmatrix.metadb.ui.MainFrame.main(MainFrame.java:269) Caused by: java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFac tory at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at com.sun.naming.internal.VersionHelper12.loadClass(Unknown Source) ... 8 more Exception in thread "main" java.lang.NullPointerException at net.massmatrix.metadb.ui.facade.UserManagerFacade.isUserNameAvailable (UserManagerFacade.java:44) at net.massmatrix.metadb.ui.MainFrame.main(MainFrame.java:269) Here are my packaged swing client Jar contents:- MetaDB-Client.jar \lib - contains all jboss\client jars \net\.. - contains class files(from both client and server) META-INF MANIFEST.MF jndi.properties Here's my jndi.properties:- java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099 Here's my MANIFEST.MF:- Manifest-Version: 1.0 Main-Class: net.massmatrix.metadb.ui.MainFrame Class-Path: lib/* Command used to create the jar:- jar cfm MetaDB-Client.jar MANIFEST.MF net\* lib\* jndi.properties What else am i missing ? Thanks.

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  • Singleton: How should it be used

    - by Loki Astari
    Edit: From another question I provided an answer that has links to a lot of questions/answers about singeltons: More info about singletons here: So I have read the thread Singletons: good design or a crutch? And the argument still rages. I see Singletons as a Design Pattern (good and bad). The problem with Singleton is not the Pattern but rather the users (sorry everybody). Everybody and their father thinks they can implement one correctly (and from the many interviews I have done, most people can't). Also because everybody thinks they can implement a correct Singleton they abuse the Pattern and use it in situations that are not appropriate (replacing global variables with Singletons!). So the main questions that need to be answered are: When should you use a Singleton How do you implement a Singleton correctly My hope for this article is that we can collect together in a single place (rather than having to google and search multiple sites) an authoritative source of when (and then how) to use a Singleton correctly. Also appropriate would be a list of Anti-Usages and common bad implementations explaining why they fail to work and for good implementations their weaknesses. So get the ball rolling: I will hold my hand up and say this is what I use but probably has problems. I like "Scott Myers" handling of the subject in his books "Effective C++" Good Situations to use Singletons (not many): Logging frameworks Thread recycling pools /* * C++ Singleton * Limitation: Single Threaded Design * See: http://www.aristeia.com/Papers/DDJ_Jul_Aug_2004_revised.pdf * For problems associated with locking in multi threaded applications * * Limitation: * If you use this Singleton (A) within a destructor of another Singleton (B) * This Singleton (A) must be fully constructed before the constructor of (B) * is called. */ class MySingleton { private: // Private Constructor MySingleton(); // Stop the compiler generating methods of copy the object MySingleton(MySingleton const& copy); // Not Implemented MySingleton& operator=(MySingleton const& copy); // Not Implemented public: static MySingleton& getInstance() { // The only instance // Guaranteed to be lazy initialized // Guaranteed that it will be destroyed correctly static MySingleton instance; return instance; } }; OK. Lets get some criticism and other implementations together. :-)

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  • Problem while reading the File in a eclipse Plugin application

    - by Abhishek Choudhary
    I 've developed an eclipse plugin and in that I have a java file trying to read directories and then populate result accordingly. When I try to run the file from eclipse itself through RunJava application , it gives me proper result but as soon as I try to run the same through Eclipse Application, it is throwing NullPointerException because unable to find the directory. I tried the following ways- Suppose , I have a package as - Package - com.test.abhishek.file.java.TestWork.java Directories - com.test.abhishek.file.java.Dir1 com.test.abhishek.file.java.Dir2 Now in TestWork.java- InputStream is = LGHelpContentView.class.getResourceAsStream("/"+dirName);** The above line is getting failed. How should I keep my directory and where so that it will run as an eclipse plug-in as well.

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  • ActivityThread exception in Android?

    - by Praveen Chandrasekaran
    My Log CAT Value: 05-17 15:16:30.572: ERROR/ActivityThread(17448): Activity com.example.brown.Bru_Maps has leaked IntentReceiver android.net.NetworkConnectivityListener$ConnectivityBroadcastReceiver@432e6360 that was originally registered here. Are you missing a call to unregisterReceiver()? 05-17 15:16:30.572: ERROR/ActivityThread(17448): android.app.IntentReceiverLeaked: Activity com.example.brown.Bru_Maps has leaked IntentReceiver android.net.NetworkConnectivityListener$ConnectivityBroadcastReceiver@432e6360 that was originally registered here. Are you missing a call to unregisterReceiver()? 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ActivityThread$PackageInfo$ReceiverDispatcher.<init>(ActivityThread.java:748) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ActivityThread$PackageInfo.getReceiverDispatcher(ActivityThread.java:576) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ApplicationContext.registerReceiverInternal(ApplicationContext.java:770) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ApplicationContext.registerReceiver(ApplicationContext.java:757) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ApplicationContext.registerReceiver(ApplicationContext.java:751) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:290) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.net.NetworkConnectivityListener.startListening(NetworkConnectivityListener.java:138) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at com.google.android.maps.MapActivity.onResume(MapActivity.java:232) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1225) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.Activity.performResume(Activity.java:3559) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2838) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2866) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1819) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.os.Handler.dispatchMessage(Handler.java:99) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.os.Looper.loop(Looper.java:123) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ActivityThread.main(ActivityThread.java:4203) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at java.lang.reflect.Method.invokeNative(Native Method) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at java.lang.reflect.Method.invoke(Method.java:521) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at dalvik.system.NativeStart.main(Native Method) What is the Activity Thread Exception in Android? Please Help.

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  • Any serious problems when making an old java web app run on new IE 8 browser?

    - by pinichi
    I need make an quick estimation on project (not sure we got): It's an old banking CMS java web app: Server: jdk5, weblogic 9. Client: winXP, Ie6. It was design only for use with ie6 but now we need make it also run well on new client: ie8,ie7 on win7. I understand the most difference is the client: DOM and CSS. But my problem is we hasn't been worked with ie8, and I have not enough time to build an testing environment because our developing environment is not ready to make test (its remoting completely, and managed by another partner) Any experience or suggestion to help me weighing this task need will be welcomed.

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  • CPU and profiling not supported for remote jvisualvm session

    - by yawn
    When monitoring a remote app (using jstatd) I can neither profile nor monitor cpu consumption. Heap monitoring (provided I do not use G1) works. jvisualvm provides the message "Not supported for this JVM." in the CPU graph window. Is there anything missing in my setup? The google showed up next to no results. The local environment (Mac OS X 10.6): java version "1.6.0_15" Java(TM) SE Runtime Environment (build 1.6.0_15-b03-219) Java HotSpot(TM) 64-Bit Server VM (build 14.1-b02-90, mixed mode) The remote environment (Linux version 2.6.16.27-0.9-smp (gcc version 4.1.0 (SUSE Linux))): java version "1.6.0_16" Java(TM) SE Runtime Environment (build 1.6.0_16-b01) Java HotSpot(TM) 64-Bit Server VM (build 14.2-b01, mixed mode) Local monitoring works as advertised.

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  • Running Hadoop example in psuedo-distributed mode on vm

    - by manas
    I have set-up Hadoop on a OpenSuse 11.2 VM using Virtualbox.I have made the prerequisite configs. I ran this example in the Standalone mode successfully. But in psuedo-distributed mode I get the following error: $./bin/hadoop fs -put conf input 10/04/13 15:56:25 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.net.SocketException: Protocol not available 10/04/13 15:56:25 INFO hdfs.DFSClient: Abandoning block blk_-8490915989783733314_1003 10/04/13 15:56:31 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.net.SocketException: Protocol not available 10/04/13 15:56:31 INFO hdfs.DFSClient: Abandoning block blk_-1740343312313498323_1003 10/04/13 15:56:37 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.net.SocketException: Protocol not available 10/04/13 15:56:37 INFO hdfs.DFSClient: Abandoning block blk_-3566235190507929459_1003 10/04/13 15:56:43 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.net.SocketException: Protocol not available 10/04/13 15:56:43 INFO hdfs.DFSClient: Abandoning block blk_-1746222418910980888_1003 10/04/13 15:56:49 WARN hdfs.DFSClient: DataStreamer Exception: java.io.IOException: Unable to create new block. at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2845) at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2102) at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2288) 10/04/13 15:56:49 WARN hdfs.DFSClient: Error Recovery for block blk_-1746222418910980888_1003 bad datanode[0] nodes == null 10/04/13 15:56:49 WARN hdfs.DFSClient: Could not get block locations. Source file "/user/max/input/core-site.xml" - Aborting... put: Protocol not available 10/04/13 15:56:49 ERROR hdfs.DFSClient: Exception closing file /user/max/input/core-site.xml : java.net.SocketException: Protocol not available java.net.SocketException: Protocol not available at sun.nio.ch.Net.getIntOption0(Native Method) at sun.nio.ch.Net.getIntOption(Net.java:178) at sun.nio.ch.SocketChannelImpl$1.getInt(SocketChannelImpl.java:419) at sun.nio.ch.SocketOptsImpl.getInt(SocketOptsImpl.java:60) at sun.nio.ch.SocketOptsImpl.sendBufferSize(SocketOptsImpl.java:156) at sun.nio.ch.SocketOptsImpl$IP$TCP.sendBufferSize(SocketOptsImpl.java:286) at sun.nio.ch.OptionAdaptor.getSendBufferSize(OptionAdaptor.java:129) at sun.nio.ch.SocketAdaptor.getSendBufferSize(SocketAdaptor.java:328) at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.createBlockOutputStream(DFSClient.java:2873) at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2826) at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2102) at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2288) Any leads will be highly appreciated.

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  • JPA @TableGenerator shared between multiple entities

    - by Mauricio
    Hi Guys, I have a 'dog' Entitiy with an @Id and a @TableGenerator ... @TableGenerator(table = "seq", name = "dog_gen", pkColumnName = "seq_name", valueColumnName="seq_val") @Id @GeneratedValue(strategy = GenerationType.TABLE, generator = "dog_gen") private Long id; ... Is there a way to reuse the same table generator (dog_gen) in other entity? I want to keep the same id sequence in two independent Entities, say dog=1, dog=2, dog=3, cat=4, cat=5, dog=6 and so on... Both entities don't share a common superclass to implement some kind of inheritance with the id property. If I add the @GeneratedValue( generator="dog_gen") on my cat entity, omitting the @TableGenerator declaration throws an Exception saying it can't find the generator when starting the context. Caused by: org.hibernate.AnnotationException: Unknown Id.generator: dog_gen at org.hibernate.cfg.BinderHelper.makeIdGenerator(BinderHelper.java:413) at org.hibernate.cfg.AnnotationBinder.bindId(AnnotationBinder.java:1795) at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:1229) at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:733) at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:498) at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:277)

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  • JOGL program does not compile - javac with classpath

    - by user1720523
    I want to run a HelloWorld JOGL programm on the commandline. I downloaded the .jars from jogamp.org and put the gluegen-rt.jar , jogl.all.jar , gluegen-java-src.zip , jogl-java-src.zip , gluegen-rt-natives-macosx-universal.jar , jogl-all-natives-macosx-universal.jar in a directory "jar" in my HelloWorld folder - as described in http://jogamp.org/wiki/index.php/Downloading_and_installing_JOGL . Now I try to compile with javac -classpath "jar/gluegen-rt.jar:jar/jogl.all.jar" HelloWorld.java as described on https://jogamp.org/wiki/index.php/Setting_up_a_JogAmp_project_in_your_favorite_IDE . Then it throws me 14 errors starting with HelloWorld.java:7: package javax.media.opengl does not exist import javax.media.opengl.GL; ^ When I try to compile with absolute paths using javac -classpath "/Users/jonas/Desktop/cool_jogl/helloworld/jar/gluegen-rt.jar:/Users/jonas/Desktop/cool_jogl/helloworld/jar/jogl-all.jar" HelloWorld.java it still throws me 12 errors starting with HelloWorld.java:9: cannot find symbol symbol : class GLCanvas location: package javax.media.opengl import javax.media.opengl.GLCanvas; ^

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  • where should we send notification for updating many views?

    - by Thanh-Cong Vo
    Hi all, I want to ask about software design. I have a task, the view controller handles UI event for calling a model manger to perform that task. After finishing, the model manager will callback to update the view. There have also other views who care about that task, and also want to update its own view when that task is finished. So I register a Notification for that task in each views. The problem is defining where should I send Notification, in Model manager or in the View who handles event and receives the callback from Model manager? What is better design? Shoud the model care about send this "common" task, or shoud the view? Thanks

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  • Connecting client (on VirtualBox) and server (on localhost) using CORBA - org.omg.CORBA.BAD_PARAM:

    - by yak
    Im working now on simple gui appllication in Java/C++ and CORBA. I want my client on VirtualBox connect to server on localhost. When I have a simple app, like a calc I wrote about earlier its just fine. But when it comes to run client which needs some args witch javas -cp option, Im getting errors. (Theres no such problem when I have both client and server in localhost!) My errors: WARNING: "IOP00100007: (BAD_PARAM) string_to_object conversion failed due to bad scheme name" org.omg.CORBA.BAD_PARAM: vmcid: OMG minor code: 7 completed: No at com.sun.corba.se.impl.logging.OMGSystemException.soBadSchemeName(Unkn own Source) at com.sun.corba.se.impl.logging.OMGSystemException.soBadSchemeName(Unkn own Source) at com.sun.corba.se.impl.resolver.INSURLOperationImpl.operate(Unknown So urce) at com.sun.corba.se.impl.resolver.ORBInitRefResolverImpl.resolve(Unknown Source) at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(Unknown Source) at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(Unknown Source) at com.sun.corba.se.impl.orb.ORBImpl.resolve_initial_references(Unknown Source) at ClientConnection.connect(ClientConnection.java:57) at Client.main(Client.java:295) Exception in thread "main" org.omg.CORBA.BAD_PARAM: vmcid: OMG minor code: 7 completed: No at com.sun.corba.se.impl.logging.OMGSystemException.soBadSchemeName(Unkn own Source) at com.sun.corba.se.impl.logging.OMGSystemException.soBadSchemeName(Unkn own Source) at com.sun.corba.se.impl.resolver.INSURLOperationImpl.operate(Unknown So urce) at com.sun.corba.se.impl.resolver.ORBInitRefResolverImpl.resolve(Unknown Source) at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(Unknown Source) at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(Unknown Source) at com.sun.corba.se.impl.orb.ORBImpl.resolve_initial_references(Unknown Source) at ClientConnection.connect(ClientConnection.java:57) at Client.main(Client.java:295) make[1]: *** [run] Error 1 ClientConnection.java:57 is a line objRef = clientORB.resolve_initial_references("NameService"); Client.java:295 is a line: ClientConnection.connect(args); A connect method is just an ordinary client-connection corba code. I ran my example: 1) C:\Temp\Client>java -cp .:../Dir1:../Dir2 Client -ORBInitRef NameService =corbaloc::192.168.56.1:2809/NameService Error: Could not find or load main class Client so its even didnt run at all .. 2) with the help of a Makefile: HOST = 192.168.56.1 PORT = 2809 NAMESERVICE = NameService run: java -cp .:../Dir1:../Dir2 Client -ORBInitRef NameService=corbaloc::$(HOST):$(PORT)/$(NAMESERVICE) by typing make run and then I got those error I posted earlier. Whats wrong? I mean, a simple code works fine but gui version doesnt want to ... is there a problem with -cp option? I cant change my apps' dir tree.

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  • crawl websites out of java web application without using bin/nutch

    - by Marcel
    hi :) i am trying to using nutch (1.1) without bin/nutch from my (java) mojarra 2.0.2 webapp... i am searching at google for examples, but there are no examples how i can realize this :/ ... i get an exception and the job fails :/ (i think of cause something with hadoop)... here is my code: public void run() throws Exception { final String[] args = new String[] { String.format("%s%s%s%s", JSFUtils.getWebAppRoot(), "nutch", File.separator, DIRECTORY_URLS), "-dir", String.format("%s%s%s%s", JSFUtils.getWebAppRoot(), "nutch", File.separator, DIRECTORY_CRAWL), "-threads", this.preferences.get("threads"), "-depth", this.preferences.get("depth"), "-topN", this.preferences.get("topN"), "-solr", this.preferences.get("solr") }; Crawl.main(args); } and a part of the logging: 10/05/17 10:42:54 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId= 10/05/17 10:42:54 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same. 10/05/17 10:42:54 INFO mapred.FileInputFormat: Total input paths to process : 1 10/05/17 10:42:54 INFO mapred.JobClient: Running job: job_local_0001 10/05/17 10:42:54 INFO mapred.FileInputFormat: Total input paths to process : 1 10/05/17 10:42:55 INFO mapred.MapTask: numReduceTasks: 1 10/05/17 10:42:55 INFO mapred.MapTask: io.sort.mb = 100 java.io.IOException: Job failed! at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1232) at org.apache.nutch.crawl.Injector.inject(Injector.java:211) at org.apache.nutch.crawl.Crawl.main(Crawl.java:124) at lan.localhost.process.NutchCrawling.run(NutchCrawling.java:108) at lan.localhost.main.Index.indexing(Index.java:71) at lan.localhost.bean.FeedingBean.actionStart(FeedingBean.java:25) .... can someone help me or tell me how i can crawling from a java application? i have increased the Xms to 256m and Xmx to 768m, but nothing changed... best regards marcel

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