Weblogic JNDI lookup in Applet

Question

Hi
We are facing problem in JNDI lookup inside the applet
here is the scenario
We have two weblogic servers(port 7001)
one server is main server where the Applet1 , weblogic.jar and app.htm
are in C:\bea\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver
and another is proxy server where HTTPProxyServlet is running and one
web.xml file ( wall these files are provided by weblogic and the port
of proxy server is 448)
Both the servers are running on different machines
and when we run the client browser and put the folloing url
http://proxyServer IP Address:448/app.htm
we get the following exception
Java(TM) Plug-in: Version 1.3.0-C
Using JRE version 1.3.0 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\kkumar
Proxy Configuration: no proxy
JAR cache enabled.
In Init.1..:
In Init.after ..doClassLoaderWorkaround
In Init.after setText:
In Init.before initjms:
In initjms begin
In initjms hostName...:10.1.10.211
In initjms before initialcontext...:
In initjms after initialcontext...:
javax.naming.ConfigurationException. Root exception is
java.rmi.MarshalException: failed to marshal public abstract
java.lang.Object
weblogic.jndi.internal.NamingNode.lookup(java.lang.String,java.util.Hashtable)
throws javax.naming.NamingException,java.rmi.RemoteException; nested
exception is:
java.io.NotSerializableException: javax.naming.InitialContext
java.io.NotSerializableException: javax.naming.InitialContext
at java.io.ObjectOutputStream.outputObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at java.io.ObjectOutputStream.outputClassFields(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
at java.io.ObjectOutputStream.outputObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at java.util.Hashtable.writeObject(Unknown Source)
at java.lang.reflect.Method.invoke(Native Method)
at java.io.ObjectOutputStream.invokeObjectWriter(Unknown Source)
at java.io.ObjectOutputStream.outputObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at
weblogic.common.internal.ChunkedObjectOutputStream.writeObject(ChunkedObjectOutputStream.java:102)
at
weblogic.common.internal.ChunkedObjectOutputStream.writeObject(ChunkedObjectOutputStream.java:108)
at weblogic.rmi.internal.ObjectIO.writeObject(ObjectIO.java:19)
at
weblogic.rmi.internal.BasicRemoteRef.marshalArgs(BasicRemoteRef.java:121)
at
weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:246)
at
weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:225)
at
weblogic.jndi.internal.ServerNamingNode_WLStub.lookup(ServerNamingNode_WLStub.java:121)
at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:323)
at javax.naming.InitialContext.lookup(Unknown Source)
at Applet1.initJMS(Applet1.java:128)
at Applet1.init(Applet1.java:46)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Initialization failed
In Init.end of initjms:
the files are here
app.htm
               <OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
                    width="650" height="300" align="baseline"
                    codebase="http://java.sun.com/products/plugin/1.2.2/jinstall-1_2_2-win.cab#Version=1,2,2,0"
>
               <PARAM NAME="code" VALUE="Applet1">
               <PARAM NAME="codebase" VALUE=".">
               <PARAM NAME="AppletName" VALUE="Applet1">
               <PARAM NAME="archive" VALUE="weblogic.jar">
               <PARAM NAME="MAYSCRIPT" VALUE="true">
               <PARAM NAME="type"
VALUE="application/x-java-applet;version=1.2.2">
               <PARAM NAME="model" VALUE="models/HyaluronicAcid.xyz">
               <PARAM NAME="scriptable" VALUE="true">
               <!--
               <COMMENT>
                    <EMBED type="application/x-java-applet;version=1.2.2" width="650"
height="300" align="baseline"
                              code="ANZPopupApplet.class" codebase="../"
model="models/HyaluronicAcid.xyz"
                         pluginspage="http://java.sun.com/products/plugin/1.2/plugin-install.html"
MAYSCRIPT="true">
                    <NOEMBED>
               </COMMENT>
               -->
                              No JDK 1.2 support for APPLET!!
                    </NOEMBED>
                    </EMBED>
               </OBJECT>
</html>
Applet1.java
import java.awt.*;
import java.applet.*;
import java.net.*;
import java.util.*;
import javax.naming.*;
import javax.jms.*;
import java.lang.reflect.*;
public class Applet1 extends Applet implements MessageListener {
private boolean started = false;
// JMS Stuff
private InitialContext jmsContext = null;
private QueueConnectionFactory jmsConnFactory = null;
private QueueConnection jmsConnection = null;
private Queue jmsQueue = null;
private QueueSession jmsSession = null;
private QueueSender jmsSender = null;
private QueueReceiver jmsReceiver = null;
// init - called to inform this applet that it has been
// loaded into the system
public void init() {
//{{INIT_CONTROLS
System.out.println("In Init.1..:");
     //doClassLoaderWorkaround();
System.out.println("In Init.after ..doClassLoaderWorkaround");
setLayout(null);
setSize(426,266);
jmslabel.setText("JMS Applet");
System.out.println("In Init.after setText:");
add(jmslabel);
jmslabel.setBounds(144,12,148,24);
textArea1.setEnabled(false);
add(textArea1);
textArea1.setBounds(24,36,375,100);
jmsleaveButton.setLabel("Leave");
add(jmsleaveButton);
jmsleaveButton.setBackground(java.awt.Color.lightGray);
jmsleaveButton.setBounds(312,240,78,20);
add(jmsMessageField);
jmsMessageField.setBounds(24,168,367,38);
System.out.println("In Init.before initjms:");
initJMS();
System.out.println("In Init.end of initjms:");
//{{DECLARE_CONTROLS
     java.awt.Label jmslabel = new java.awt.Label();
     java.awt.TextArea textArea1 = new java.awt.TextArea();
     java.awt.Button jmsleaveButton = new java.awt.Button();
     java.awt.TextField jmsMessageField = new java.awt.TextField();
// getAppletInfo - Returns information about this applet.
public String getAppletInfo() {
return "JMS Applet\r\n";
// destroy - called to inform this applet that it is being
// reclaimed and that it should destroy any resources that
// it has allocated.
public void destroy() {
try {
if(started) {
if (jmsConnection != null) {
jmsConnection.stop();
jmsConnection = null;
started = false;
stop();
catch(Exception e) {
// start - called to inform this applet that it should start its
execution
public void start() {
if(!started) {
started = true;
// stop - Called to inform this applet that it should stop its
execution
public void stop() {
textArea1.setEnabled(false);
jmsMessageField.setEnabled(false);
// action - handles entering message, Leave button clicked
public boolean action(Event evt, Object obj) {
System.out.println("In action begin:");
if(evt.id == Event.ACTION_EVENT) {
if(obj.equals(jmsMessageField.getText())) {
System.out.println("In action before sendData:");
sendData(jmsMessageField.getText());
System.out.println("In action after sendData:");
jmsMessageField.setText("");
return true;
if(obj.equals(jmsleaveButton.getLabel())) {
destroy();
return true;
// initJMS - initialize all of the JMS stuff
private void initJMS() {
try {
System.out.println("In initjms begin");
String hostName = this.getCodeBase().getHost();
System.out.println("In initjms hostName...:"+hostName);
Hashtable env = new Hashtable();
env.put(Context.APPLET,this);
env.put(Context.PROVIDER_URL,
"t3://" + hostName + ":448");
env.put(Context.INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
System.out.println("In initjms before initialcontext...:");
jmsContext = new InitialContext(env);
System.out.println("In initjms after initialcontext...:");
jmsConnFactory
=(QueueConnectionFactory)jmsContext.lookup("javax.jms.QueueConnectionFactory");
System.out.println("In initjms after initialcontext..lookup.:");
jmsConnection = jmsConnFactory.createQueueConnection();
System.out.println("In initjms after initialcontext..lookup1.:");
jmsSession = jmsConnection.createQueueSession(false,Session.AUTO_ACKNOWLEDGE);
System.out.println("In initjms before lookup...:");
jmsQueue =(Queue)jmsContext.lookup("jms.queue.TestQueue1");
jmsConnection.start();
jmsSender = jmsSession.createSender(jmsQueue);
jmsReceiver = jmsSession.createReceiver(jmsQueue);
jmsReceiver.setMessageListener(this);
System.out.println("In initjms before setMessageListener...end of the
const:");
catch(Exception e) {
e.printStackTrace();
System.out.println("Initialization failed");
// sendData - sends a message
void sendData(String data) {
try {
System.out.println("In sendData before createTextMessage:");
TextMessage message = jmsSession.createTextMessage();
message.setText(data);
jmsSender.send(message);
System.out.println("In sendData end data:"+data);
catch(Exception e) {
System.out.println("Failed to send message");
// onMessage - asynchronously receives a message
public void onMessage(Message message) {
String data;
try {
System.out.println("In onMessage:");
data = ((TextMessage)message).getText();
System.out.println("In onMessage data:"+data);
textArea1.append(data + "\n");
repaint();
System.out.println("In onMessage end:");
catch(Exception e) {
System.out.println("Failed to receive message");
private void doClassLoaderWorkaround(){
boolean didit = false;
// Get the ClassLoader of this applet:
ClassLoader cloader = this.getClass().getClassLoader();
if (cloader == null){
System.out.println("### getClassLoader() returned null");
else
// We might call this handy utility routine:
// boolean didit =
Thread.currentThread().setContextClassLoader(cloader);
     Method setContextClassLoaderMeth = null;
     try {
          Method [] allMethods = Thread.class.getMethods();
          for ( int i = 0; i < allMethods.length; i++ ) {
               if (allMethods.getName().equals("setContextClassLoader")) {
                    setContextClassLoaderMeth = allMethods[i];
                    break;
     catch(Exception e) {
          System.out.println("---Exception " + e);
// but we don't because we need more visibility about what goes
wrong.
// Rather, reproduce that logic here, with extra error messages:
//Method setContextClassLoaderMeth = null;
try{
// Class params = ClassLoader.class ;
// setContextClassLoaderMeth =
//Thread.class.getMethod("setContextClassLoader", params);
catch (NoSuchMethodException ne) {
setContextClassLoaderMeth = null;
System.out.println("--- This java version does not have the
method 'setContextClassLoader'. Not a problem.");
return;
catch (Exception ae){
setContextClassLoaderMeth = null;
System.out.println("### Thread.class.getMethod() threw
unexpected exception: " + ae.getMessage());
if (setContextClassLoaderMeth != null){
Object[] args = { cloader };
try{
setContextClassLoaderMeth.invoke(Thread.currentThread(),
args);
didit = true;
catch (InvocationTargetException ite){
Throwable be = ite.getTargetException();
System.out.println("### Thread.setContextClassLoader() failed:
InvocationTargetException: " + be.getMessage());
catch (Exception ie){
System.out.println("### Thread.setContextClassLoader() threw
unexpected exception: " + ie.getMessage());
if (didit){
System.out.println("--- Succeeded in setting the
ContextClassLoader of this thread to be this applet's own
ClassLoader");
else{
System.out.println("### Could not set ContextClassLoader,
additional threads may not be able");
System.out.println("### to get a JNDI Context in java 122 or
greater.");
any clue or thought. please help
regards
mohan

Answer 1

It looks like the object that you have placed into the JNDO tree is not serializable or doesnt implement exernalizable!
java.io.NotSerializableException
0rrc
On 26 Jul 2001 16:10:35 -0700, [email protected] (Mohan Raj) wrote:
Hi
We are facing problem in JNDI lookup inside the applet
here is the scenario
We have two weblogic servers(port 7001)
one server is main server where the Applet1 , weblogic.jar and app.htm
are in C:\bea\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver
and another is proxy server where HTTPProxyServlet is running and one
web.xml file ( wall these files are provided by weblogic and the port
of proxy server is 448)
Both the servers are running on different machines
and when we run the client browser and put the folloing url
http://proxyServer IP Address:448/app.htm
we get the following exception
Java(TM) Plug-in: Version 1.3.0-C
Using JRE version 1.3.0 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\kkumar
Proxy Configuration: no proxy
JAR cache enabled.
In Init.1..:
In Init.after ..doClassLoaderWorkaround
In Init.after setText:
In Init.before initjms:
In initjms begin
In initjms hostName...:10.1.10.211
In initjms before initialcontext...:
In initjms after initialcontext...:
javax.naming.ConfigurationException. Root exception is
java.rmi.MarshalException: failed to marshal public abstract
java.lang.Object
weblogic.jndi.internal.NamingNode.lookup(java.lang.String,java.util.Hashtable)
throws javax.naming.NamingException,java.rmi.RemoteException; nested
exception is:
java.io.NotSerializableException: javax.naming.InitialContext
java.io.NotSerializableException: javax.naming.InitialContext
at java.io.ObjectOutputStream.outputObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at java.io.ObjectOutputStream.outputClassFields(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
at java.io.ObjectOutputStream.outputObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at java.util.Hashtable.writeObject(Unknown Source)
at java.lang.reflect.Method.invoke(Native Method)
at java.io.ObjectOutputStream.invokeObjectWriter(Unknown Source)
at java.io.ObjectOutputStream.outputObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at
weblogic.common.internal.ChunkedObjectOutputStream.writeObject(ChunkedObjectOutputStream.java:102)
at
weblogic.common.internal.ChunkedObjectOutputStream.writeObject(ChunkedObjectOutputStream.java:108)
at weblogic.rmi.internal.ObjectIO.writeObject(ObjectIO.java:19)
at
weblogic.rmi.internal.BasicRemoteRef.marshalArgs(BasicRemoteRef.java:121)
at
weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:246)
at
weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:225)
at
weblogic.jndi.internal.ServerNamingNode_WLStub.lookup(ServerNamingNode_WLStub.java:121)
at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:323)
at javax.naming.InitialContext.lookup(Unknown Source)
at Applet1.initJMS(Applet1.java:128)
at Applet1.init(Applet1.java:46)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Initialization failed
In Init.end of initjms:
the files are here
app.htm
               <OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
                    width="650" height="300" align="baseline"
                    codebase="http://java.sun.com/products/plugin/1.2.2/jinstall-1_2_2-win.cab#Version=1,2,2,0"
>
               <PARAM NAME="code" VALUE="Applet1">
               <PARAM NAME="codebase" VALUE=".">
               <PARAM NAME="AppletName" VALUE="Applet1">
               <PARAM NAME="archive" VALUE="weblogic.jar">
               <PARAM NAME="MAYSCRIPT" VALUE="true">
               <PARAM NAME="type"
VALUE="application/x-java-applet;version=1.2.2">
               <PARAM NAME="model" VALUE="models/HyaluronicAcid.xyz">
               <PARAM NAME="scriptable" VALUE="true">
               <!--
               <COMMENT>
                    <EMBED type="application/x-java-applet;version=1.2.2" width="650"
height="300" align="baseline"
                              code="ANZPopupApplet.class" codebase="../"
model="models/HyaluronicAcid.xyz"
                         pluginspage="http://java.sun.com/products/plugin/1.2/plugin-install.html"
MAYSCRIPT="true">
                    <NOEMBED>
               </COMMENT>
               -->
                              No JDK 1.2 support for APPLET!!
                    </NOEMBED>
                    </EMBED>
               </OBJECT>
</html>
Applet1.java
import java.awt.*;
import java.applet.*;
import java.net.*;
import java.util.*;
import javax.naming.*;
import javax.jms.*;
import java.lang.reflect.*;
public class Applet1 extends Applet implements MessageListener {
private boolean started = false;
// JMS Stuff
private InitialContext jmsContext = null;
private QueueConnectionFactory jmsConnFactory = null;
private QueueConnection jmsConnection = null;
private Queue jmsQueue = null;
private QueueSession jmsSession = null;
private QueueSender jmsSender = null;
private QueueReceiver jmsReceiver = null;
// init - called to inform this applet that it has been
// loaded into the system
public void init() {
//{{INIT_CONTROLS
System.out.println("In Init.1..:");
     //doClassLoaderWorkaround();
System.out.println("In Init.after ..doClassLoaderWorkaround");
setLayout(null);
setSize(426,266);
jmslabel.setText("JMS Applet");
System.out.println("In Init.after setText:");
add(jmslabel);
jmslabel.setBounds(144,12,148,24);
textArea1.setEnabled(false);
add(textArea1);
textArea1.setBounds(24,36,375,100);
jmsleaveButton.setLabel("Leave");
add(jmsleaveButton);
jmsleaveButton.setBackground(java.awt.Color.lightGray);
jmsleaveButton.setBounds(312,240,78,20);
add(jmsMessageField);
jmsMessageField.setBounds(24,168,367,38);
System.out.println("In Init.before initjms:");
initJMS();
System.out.println("In Init.end of initjms:");
//{{DECLARE_CONTROLS
     java.awt.Label jmslabel = new java.awt.Label();
     java.awt.TextArea textArea1 = new java.awt.TextArea();
     java.awt.Button jmsleaveButton = new java.awt.Button();
     java.awt.TextField jmsMessageField = new java.awt.TextField();
// getAppletInfo - Returns information about this applet.
public String getAppletInfo() {
return "JMS Applet\r\n";
// destroy - called to inform this applet that it is being
// reclaimed and that it should destroy any resources that
// it has allocated.
public void destroy() {
try {
if(started) {
if (jmsConnection != null) {
jmsConnection.stop();
jmsConnection = null;
started = false;
stop();
catch(Exception e) {
// start - called to inform this applet that it should start its
execution
public void start() {
if(!started) {
started = true;
// stop - Called to inform this applet that it should stop its
execution
public void stop() {
textArea1.setEnabled(false);
jmsMessageField.setEnabled(false);
// action - handles entering message, Leave button clicked
public boolean action(Event evt, Object obj) {
System.out.println("In action begin:");
if(evt.id == Event.ACTION_EVENT) {
if(obj.equals(jmsMessageField.getText())) {
System.out.println("In action before sendData:");
sendData(jmsMessageField.getText());
System.out.println("In action after sendData:");
jmsMessageField.setText("");
return true;
if(obj.equals(jmsleaveButton.getLabel())) {
destroy();
return true;
// initJMS - initialize all of the JMS stuff
private void initJMS() {
try {
System.out.println("In initjms begin");
String hostName = this.getCodeBase().getHost();
System.out.println("In initjms hostName...:"+hostName);
Hashtable env = new Hashtable();
env.put(Context.APPLET,this);
env.put(Context.PROVIDER_URL,
"t3://" + hostName + ":448");
env.put(Context.INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
System.out.println("In initjms before initialcontext...:");
jmsContext = new InitialContext(env);
System.out.println("In initjms after initialcontext...:");
jmsConnFactory
=(QueueConnectionFactory)jmsContext.lookup("javax.jms.QueueConnectionFactory");
System.out.println("In initjms after initialcontext..lookup.:");
jmsConnection = jmsConnFactory.createQueueConnection();
System.out.println("In initjms after initialcontext..lookup1.:");
jmsSession = jmsConnection.createQueueSession(false,Session.AUTO_ACKNOWLEDGE);
System.out.println("In initjms before lookup...:");
jmsQueue =(Queue)jmsContext.lookup("jms.queue.TestQueue1");
jmsConnection.start();
jmsSender = jmsSession.createSender(jmsQueue);
jmsReceiver = jmsSession.createReceiver(jmsQueue);
jmsReceiver.setMessageListener(this);
System.out.println("In initjms before setMessageListener...end of the
const:");
catch(Exception e) {
e.printStackTrace();
System.out.println("Initialization failed");
// sendData - sends a message
void sendData(String data) {
try {
System.out.println("In sendData before createTextMessage:");
TextMessage message = jmsSession.createTextMessage();
message.setText(data);
jmsSender.send(message);
System.out.println("In sendData end data:"+data);
catch(Exception e) {
System.out.println("Failed to send message");
// onMessage - asynchronously receives a message
public void onMessage(Message message) {
String data;
try {
System.out.println("In onMessage:");
data = ((TextMessage)message).getText();
System.out.println("In onMessage data:"+data);
textArea1.append(data + "\n");
repaint();
System.out.println("In onMessage end:");
catch(Exception e) {
System.out.println("Failed to receive message");
private void doClassLoaderWorkaround(){
boolean didit = false;
// Get the ClassLoader of this applet:
ClassLoader cloader = this.getClass().getClassLoader();
if (cloader == null){
System.out.println("### getClassLoader() returned null");
else
// We might call this handy utility routine:
// boolean didit =
Thread.currentThread().setContextClassLoader(cloader);
     Method setContextClassLoaderMeth = null;
     try {
          Method [] allMethods = Thread.class.getMethods();
          for ( int i = 0; i < allMethods.length; i++ ) {
               if (allMethods.getName().equals("setContextClassLoader")) {
                    setContextClassLoaderMeth = allMethods[i];
                    break;
     catch(Exception e) {
          System.out.println("---Exception " + e);
// but we don't because we need more visibility about what goes
wrong.
// Rather, reproduce that logic here, with extra error messages:
//Method setContextClassLoaderMeth = null;
try{
// Class params = ClassLoader.class ;
// setContextClassLoaderMeth =
//Thread.class.getMethod("setContextClassLoader", params);
catch (NoSuchMethodException ne) {
setContextClassLoaderMeth = null;
System.out.println("--- This java version does not have the
method 'setContextClassLoader'. Not a problem.");
return;
catch (Exception ae){
setContextClassLoaderMeth = null;
System.out.println("### Thread.class.getMethod() threw
unexpected exception: " + ae.getMessage());
if (setContextClassLoaderMeth != null){
Object[] args = { cloader };
try{
setContextClassLoaderMeth.invoke(Thread.currentThread(),
args);
didit = true;
catch (InvocationTargetException ite){
Throwable be = ite.getTargetException();
System.out.println("### Thread.setContextClassLoader() failed:
InvocationTargetException: " + be.getMessage());
catch (Exception ie){
System.out.println("### Thread.setContextClassLoader() threw
unexpected exception: " + ie.getMessage());
if (didit){
System.out.println("--- Succeeded in setting the
ContextClassLoader of this thread to be this applet's own
ClassLoader");
else{
System.out.println("### Could not set ContextClassLoader,
additional threads may not be able");
System.out.println("### to get a JNDI Context in java 122 or
greater.");
any clue or thought. please help
regards
mohan