Both Netscape and IE (with plugin 1.2.2) hang when I try to reload a page
with for example a simple hello applet (based on the hello application from
the orion-primer: see code bellow). IE even completely hangs my Win98
system.
The first time I connect to the page it loads the plugin nicely and comes
up with the right results:no problem yet. At this moment I can run a second
page connecting to a different application on the server (still no
problem), but when I connect for the second time to either the hello applet
or the second application it hangs up, Netscape or Win98.
The first idea (because Win98 hangs) that it has to do with networking
stuff is confirmed by the fact that reloading Swing applets without jndi
calls don't give any problems at all.
Any suggestions?
Frank Eggink
The applet code is:
======================================================
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import java.io.IOException;
import java.util.Date;
import java.util.Properties;
import javax.naming.*;
import javax.rmi.PortableRemoteObject;
import hello.ejb.Hello;
import hello.ejb.HelloHome;
// Simple version of the Hello applet
public class HelloApplet extends JApplet
{
public void init()
{
JTextArea textArea= new JTextArea();
textArea.setLineWrap(true); // In case of long lines
textArea.append("Init applet ...");
setContentPane(textArea);
Context jndiContext;
try
{
jndiContext = new InitialContext();
}
catch (NamingException exception)
{
textArea.append("\nUnable to get initial context: " +
exception.toString());
textArea.append("\nSetting context to null");
jndiContext=null;
}
if (jndiContext != null)
{
textArea.append("\nWe've got an initial context");
}
else
{
textArea.append("\nContext is null");
}
// Get a reference to the Hello home interface
HelloHome helloHome;
try
{
Object boundObject =
jndiContext.lookup("java:comp/env/ejb/HelloHome");
helloHome = (HelloHome)
PortableRemoteObject.narrow(boundObject,
HelloHome.class);
}
catch (Throwable exception)
{
System.out.println("Unable to get home interface: " +
exception.toString());
helloHome=null;
}
if (helloHome != null)
{
textArea.append("\nI've got a reference to HelloHome.");
}
else
{
textArea.append("\nhelloHome is null");
}
// Get a reference to a Hello instance
Hello hello;
try {
hello = helloHome.create();
}
catch (Throwable exception) {
System.out.println ("Unable to create a new Hello instance: " +
exception.toString());
hello = null;
}
if (hello != null)
{
textArea.append("\nI should have a reference to a legal Hello
object by
now.");
}
else
{
textArea.append("\nhello is null");
}
try
{
textArea.append("\n\nAt " + new Date().toString() + " Your
Server said:
-- " + hello.sayHello() + " --\n");
}
catch(Throwable exception)
{
textArea.append("\nServer didn't say hello ...");
System.out.println("Unable to receive an answer from the
server:\n" +
exception.toString());
}
textArea.append("\nExit cleanly");
}
}
======================================================
The html files are:
================ Internet Explorer ========================
<HTML>
<HEAD>
<TITLE>The hello applet contacting a Session Bean [Internet
Explorer]</TITLE>
</HEAD>
<BODY>
<OBJECT CLASSID="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
CODEBASE="http://java.sun.com/products/plugin/1.1
/jinstall-11-win32.cab#Version=1,1,0,0"
WIDTH=426
HEIGHT=266>
<PARAM NAME="TYPE" VALUE="application/x-java-applet;
version=1.1">
<PARAM NAME="CODE" VALUE="HelloApplet.class">
<PARAM NAME="CODEBASE" VALUE="applet">
<PARAM NAME="ARCHIVE"
VALUE=".,hello.jar,jndi.properties,orion-primer-client.jar,orion.jar,jnd
i.jar">
</OBJECT>
</BODY>
</HTML>
================= Netscape ======================
<html>
<title>The hello applet contacting a Session Bean [Netscape]</title>
<body bgcolor="white">
<h3> Your server says : </h3>
<EMBED type="application/x-java-applet;version=1.2" width="800"
height="600" code="HelloApplet.class" codebase="applet"
archive=".,hello.jar,jndi.properties,orion-primer-client.jar,jndi.jar,or
ion.jar"
pluginspage="http://java.sun.com/products/plugin/1.2/plugin-install.html">
<NOEMBED>
Plugin tag OBJECT or EMBED not supported by browser.
</NOEMBED>
</EMBED>
<p>
<h4>
<font color=red>
The above applet is loaded using the Java Plugin from a jsp page using the
plugin tag.
</font>
</h4>
</body>
</html>
