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