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  1. JDK
  2. JDK-8017770

webstart swing applications that use rmi with invokeLater are broken in u25

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P3
    • Resolution: Duplicate
    • Affects Version/s: 7u25
    • Fix Version/s: 7u40
    • Component/s: deploy
    • Labels:

      Description

      FULL PRODUCT VERSION :
      java version " 1.7.0_25 "
      Java(TM) SE Runtime Environment (build 1.7.0_25-b15)
      Java HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode)


      ADDITIONAL OS VERSION INFORMATION :
      Linux cawcdhplnx016.nss.vzwnet.com 2.6.32-220.4.2.el6.x86_64 #1 SMP Mon Feb 6 16:39:28 EST 2012 x86_64 x86_64 x86_64 GNU/Linux

      Windows: Version 6.1.7601

      A DESCRIPTION OF THE PROBLEM :
      On both Linux and Windows running 7u25, webstart applications that use RMI with SwingUtlities.invokeLater throw a NPE.

      If started from the command line, the program works fine -- only fails if started via web start.
      Earlier JRE versions work fine.
      Fails on both Linux and Windows.

      See the full stack trace below.


       java.lang.NullPointerException
              at sun.awt.SunToolkit.getSystemEventQueueImplPP(SunToolkit.java:1011)
              at sun.awt.SunToolkit.getSystemEventQueueImplPP(SunToolkit.java:1007)
              at sun.awt.SunToolkit.getSystemEventQueueImpl(SunToolkit.java:1002)
              at java.awt.Toolkit.getEventQueue(Toolkit.java:1730)
              at java.awt.EventQueue.invokeLater(EventQueue.java:1217)


      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      See sample code below.

      -Compile MainServer and Message into a jar (in this case RmiTest.jar) and place on web server.
      -Launch via the attached JNLP file.
      -From the command line or IDE, run MainClient

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      The JLabel text will update successfully.
      ACTUAL -
      The 'MainClint' will throw a NPE every time.

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      java.lang.NullPointerException
      at sun.awt.SunToolkit.getSystemEventQueueImplPP(SunToolkit.java:1011)
      at sun.awt.SunToolkit.getSystemEventQueueImplPP(SunToolkit.java:1007)
      at sun.awt.SunToolkit.getSystemEventQueueImpl(SunToolkit.java:1002)
      at java.awt.Toolkit.getEventQueue(Toolkit.java:1730)
      at java.awt.EventQueue.invokeLater(EventQueue.java:1217)
      at javax.swing.SwingUtilities.invokeLater(SwingUtilities.java:1290)
      at MainServer.sayHello(MainServer.java:41)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:606)
      at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)
      at sun.rmi.transport.Transport$1.run(Transport.java:177)
      at sun.rmi.transport.Transport$1.run(Transport.java:174)
      at java.security.AccessController.doPrivileged(Native Method)
      at sun.rmi.transport.Transport.serviceCall(Transport.java:173)
      at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553)
      at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808)
      at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
      at java.lang.Thread.run(Thread.java:724)
      at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:255)
      at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:233)
      at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:142)
      at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:178)
      at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:132)
      at $Proxy0.sayHello(Unknown Source)
      at MainClient.doTest(MainClient.java:18)
      at MainClient.main(MainClient.java:28)


      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      MainServer.java:
      public class MainServer extends UnicastRemoteObject implements Message {
          
          private void startServer(){
              try {
                  // create on port 1099
                  Registry registry = LocateRegistry.createRegistry(1099);
                  
                  // create a new service named myMessage
                  registry.rebind( " myMessage " , this);
              } catch (Exception e) {
                  e.printStackTrace();
              }
              System.out.println( " system is ready " );
          }
          
          public static void main(String[] args) throws Exception {
          final MainServer mMain = new MainServer();
          mMain.startServer();

              javax.swing.SwingUtilities.invokeLater(new Runnable() {
                  public void run() {
                  mMain.createAndShowGUI();
                      System.out.println( " Main: " + this);
                }
              });}
          
          public MainServer() throws RemoteException {
          }
          
          @Override
          public void sayHello(final String name) throws RemoteException {
          final String mText = " hello " +name;
              javax.swing.SwingUtilities.invokeLater(new Runnable() {
                  public void run() {
                      iLabel.setText(mText);
                      iFrame.pack();
                   
                  }
              });
             System.out.println( " Text: " + mText + " , " + this);
             
          }

          JLabel iLabel;
          JFrame iFrame;
          JPanel iPanel;
          void createAndShowGUI() {
              //Create and set up the window.
          iFrame = new JFrame( " rmi test " );
          iFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

          iPanel = new JPanel();
          iFrame.add(iPanel);
              //Add the ubiquitous " Hello World " label.
              iLabel = new JLabel( " Hello World " );
              iPanel.add(iLabel);

              //Display the window.
              iFrame.pack();
              iFrame.setVisible(true);
          }

          
      }

      Message.java
      public interface Message extends Remote {
          void sayHello(String name) throws RemoteException;
      }


      MainClient.java
      public class MainClient {
          
          private void doTest(){
              try {
      // fire to localhost port 1099
                  Registry myRegistry = LocateRegistry.getRegistry( " cawcdhplnx016 " , 1099);

      // search for myMessage service
                  Message impl = (Message) myRegistry.lookup( " myMessage " );

      // call server's method
                  impl.sayHello( " at " + new Date());

                  System.out.println( " Message Sent " );
              } catch (Exception e) {
                  e.printStackTrace();
              }
          }
          
          public static void main(String[] args) {
          MainClient main = new MainClient();
              main.doTest();
          }
      }

      JNLP file:
      <?xml version= " 1.0 " encoding= " utf-8 " ?>
      <!-- JNLP File for RTT's ALU LTE -->
      <jnlp
        spec= " 1.0+ "
        codebase= " http://realtime.eng.vzwcorp.com/webstart/test/RmiTest " >
        <information>
          <title>RMI Test</title>
          <vendor>Blah</vendor>
          <homepage href= " docs/help.html " />
          <description> " RMI Test " </description>
          <description kind= " short " > " RMI Test " </description>
          <icon href= " images/Chart11.gif " />
          <icon kind= " splash " href= " images/Chart11.gif " />
        </information>
        <security>
            <all-permissions/>
        </security>
        <resources>
          <j2se version= " 1.7+ " java-vm-args= " -Xmx768m -Xss1m " />
          <jar href= " RmiTest.jar " main= " true " />
        </resources>
        <application-desc main-class= " MainServer " />
      </jnlp>




      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      unknown

      SUPPORT :
      YES

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              • Assignee:
                ddehaven David Dehaven (Inactive)
                Reporter:
                webbuggrp Webbug Group
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                Dates

                • Created:
                  Updated:
                  Resolved: