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  1. JDK
  2. JDK-4171490

The memory size of Java VM increases without any limitation.

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    • Subcomponent:
    • CPU:
      sparc
    • OS:
      solaris_2.5.1

      Description

       
      chosho.kyo@japan 1998-09-05

      (1) Working environments
      OS : Solaris2.5.1 Japanese version
      Browser : Netscape Communicator4.04J
      Java Plug-in : Java Plug-in 1.1.1 g
      JRE : JRE1.1.6 within Plug-in
      Window : CDE
      Japanese Input : Atok7

      (2) Phenomenon
      Step1: Start NC with Java Plug-in.
      Step2: Read a html file with applet.
      Step3: Read another html file with another applet.
      Step4: Repeat Step3 over and over to read other html with different applet.
             The memory size of Java VM increases without any limitation.
             Sometimes netscape will show a dialog window
             say:[Plugin: Java VM process has died.].



      I have got the new test programs for reproducing BugId:4171490
      from Ntt Comware.
      Please check them.


      (1) Working environments
      OS : Solaris2.5.1 Japanese version
      Browser : Netscape Communicator4.04J
      Java Plug-in : Java Plug-in 1.1.1 g
      JRE : JRE1.1.6 within Plug-in
      Window : CDE
      Japanese Input : Atok7

      (2) Test steps

      [Step1] Compile F1main.java and F2main.java
      [Step2] Build a environment to run both applets above.
              Assume there is a WWW environment called
              http://speed.japan/~kyo/ and make directories
              as follows.
              
              $mkdir test
              $cd test
              $mkdir Frame2
              
              Put F1main.class, F1Thread.class and all HTML files
              under the directory test.
              Put F2main.class under the directory test/F2main.

      [Step3] Read http://speed.japan/~kyo/test/sample.html
              The above address is a real one, you can access it directly.

      [Step4] Two frames appear and then you can test it.
              Click start button on the upper frame, then a lower frame
              will be reloaded automaticlly until you click the stop button
              of the upper frame.

      [Step5] Observe the growth of the memory state like following.
              
              $ps -u username -o pmem,fname | grep java_vm

              You will find the memory of the java_vm grows indefinitely.

      /*----------F1main.java-----------*/
      import java.applet.*;
      import java.awt.*;
      import java.awt.event.*;
      import java.net.*;


      public class F1main extends Applet implements ActionListener{
      public Label tf = null;
      private F1Thread f1Thread;
      private Button startButton;
      private Button stopButton;

      public void init(){

      setLayout(new GridLayout(4,1));

      // Create Version Label
      add(new Label("Auto HTML read program ver 1.0"));

      // Create Counter Fileld
      tf = new Label();
      add(tf);

      // Create Start Button
      startButton = new Button("start");
      startButton.addActionListener(this);
      add(startButton);

      //Create StopButton
      stopButton = new Button("stop");
      stopButton.addActionListener(this);
      stopButton.setEnabled(false);
      add(stopButton);

      }

      public void actionPerformed(ActionEvent e){
      if(e.getSource() == startButton){
      startButton.setEnabled(false);
      stopButton.setEnabled(true);
      f1Thread = new F1Thread( this, tf );
      }
      if(e.getSource() == stopButton){
      startButton.setEnabled(true);
      stopButton.setEnabled(false);
      f1Thread.stop();
      }
      }
      }

      class F1Thread extends Thread{
      private Label setl = null;
      private String http = null;
      private Applet parent = null;
      static final private String htmlFile = "F2main.html";


      public F1Thread(Applet parent, Label tf){

      URL url;
      String host;
      String base;
      int pos;

      this.setl = tf;
      this.parent = parent;

      // Create URL Address
      url = parent.getDocumentBase();
      host = url.getHost();
      base = url.getFile();
      base = base.substring(0,base.lastIndexOf("/")+1);
      http = "http://";
      http += host;
      http += base;
      http += htmlFile;

      this.start();
      }

      public void run(){
      for(int i=0;;i++){
      try{
      parent.getAppletContext().showDocument(new URL(http), "FRAME2");
      this.setl.setText(Integer.toString(i));
      sleep(5000);
      }
      catch(Exception e){
      System.out.println("F1Thread " + e.toString());
      return;
      }

      }
      }
      }

      /*----------F2main.java-----------*/
      import java.applet.*;
      import java.awt.*;
      import java.awt.event.*;
      import java.io.*;
      import java.net.*;


      public class F2main extends Applet{
      public void init(){
      setLayout(new GridLayout());
      Label label = new Label("This is F2main.");
      add(label);

      }
      }

      ------------F1main.html-------------
      <HTML>
      <!--"CONVERTED_APPLET"-->
      <!-- CONVERTER VERSION 1.0 -->
      <OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
      WIDTH = 400 HEIGHT = 100
       codebase="http://java.sun.com/products/plugin/1.1/jinstall-11-win32.cab#Ver
      sion=1,1,0,0">
      <PARAM NAME = CODE VALUE = F1main.class >

      <PARAM NAME="type" VALUE="application/x-java-applet;version=1.1">
      <COMMENT>
      <EMBED type="application/x-java-applet;version=1.1" java_CODE = F1main.class
      WIDTH = 400 HEIGHT = 100
        pluginspage="http://java.sun.com/products/plugin/1.1/plugin-install.html">
      <NOEMBED></COMMENT>

      </NOEMBED></EMBED>
      </OBJECT>

      <!--
      <APPLET CODE = F1main.class WIDTH = 400 HEIGHT = 100 >


      </APPLET>
      -->
      <!--"END_CONVERTED_APPLET"-->

      </HTML>

      ------------F2main.html-------------
      <HTML>
      <!--"CONVERTED_APPLET"-->
      <!-- CONVERTER VERSION 1.0 -->
      <OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
      WIDTH = 400 HEIGHT = 100
       codebase="http://java.sun.com/products/plugin/1.1/jinstall-11-win32.cab#Ver
      sion=1,1,0,0">
      <PARAM NAME = CODE VALUE = F2main.class >
      <PARAM NAME = CODEBASE VALUE = "Frame2" >

      <PARAM NAME="type" VALUE="application/x-java-applet;version=1.1">
      <COMMENT>
      <EMBED type="application/x-java-applet;version=1.1" java_CODE = F2main.class
      java_CODEBASE = "Frame2" WIDTH = 400 HEIGHT = 100
        pluginspage="http://java.sun.com/products/plugin/1.1/plugin-install.html">
      <NOEMBED></COMMENT>

      </NOEMBED></EMBED>
      </OBJECT>

      <!--
      <APPLET CODE = F2main.class CODEBASE = "Frame2" WIDTH = 400 HEIGHT = 100
      >


      </APPLET>
      -->
      <!--"END_CONVERTED_APPLET"-->

      </HTML>

      ------------sample.html-------------
      <HTML>
          <HEAD>
              <TITLE>Applet Reload test</TITLE>
          </HEAD>
          <FRAMESET ROWS="50%,50%">
              <FRAME SRC="F1main.html" NAME="FRAME1">
              <FRAME SRC="F2main.html" NAME="FRAME2">

          </FRAMESET>
      </HTML>



      chosho.kyo@japan 1998-09-10

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              Assignee:
              pongsunw Patrick Ong (Inactive)
              Reporter:
              duke J. Duke (Inactive)
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                Updated:
                Resolved:
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