I awoke one morning and found something wrong T.T

Question

Dear members...
I develop something in the env. of Sun Java System Message Queue. yes.. all is perfect.. to yesterday.
When I awake this morning , and run "imqbrokerd.exe" and.. run My simple application,
I find something wrong..
here is messge (imqbrokerd.exe with -verbose)
C:\_WEIRD\JMSServer\MessageQueue3\bin>imqbrokerd.exe -verbose
Starting iMQ Broker
imqhome=C:\_WEIRD\JMSServer\MessageQueue3
imqvarhome=C:\_WEIRD\JMSServer\MessageQueue3\var
jrehome=C:\Program Files\Java\jre1.5.0
Java VM Arguments:
argv[0]=-cp
argv[1]=C:\_WEIRD\JMSServer\MessageQueue3\lib\imqbroker.jar;C:\_WEIRD\JMSServer\
MessageQueue3\lib\imqutil.jar;C:\_WEIRD\JMSServer\MessageQueue3\lib\jsse.jar;C:\
WEIRD\JMSServer\MessageQueue3\lib\jnet.jar;C:\WEIRD\JMSServer\MessageQueue3\li
b\jcert.jar;C:\_WEIRD\JMSServer\MessageQueue3\lib\ext
argv[2]=-Dimq.home=C:\_WEIRD\JMSServer\MessageQueue3
argv[3]=-Dimq.varhome=C:\_WEIRD\JMSServer\MessageQueue3\var
argv[4]=-Xms16m
argv[5]=-Xmx192m
Broker Arguments
iMQ Broker: Starting "C:\Program Files\Java\jre1.5.0\bin\java" "-cp" "C:\_WEIRD\
JMSServer\MessageQueue3\lib\imqbroker.jar;C:\_WEIRD\JMSServer\MessageQueue3\lib\
imqutil.jar;C:\_WEIRD\JMSServer\MessageQueue3\lib\jsse.jar;C:\_WEIRD\JMSServer\M
essageQueue3\lib\jnet.jar;C:\_WEIRD\JMSServer\MessageQueue3\lib\jcert.jar;C:\_WE
IRD\JMSServer\MessageQueue3\lib\ext" "-Dimq.home=C:\_WEIRD\JMSServer\MessageQueu
e3" "-Dimq.varhome=C:\_WEIRD\JMSServer\MessageQueue3\var" "-Xms16m" "-Xmx192m" c
om.sun.messaging.jmq.jmsserver.Broker
[29/11월/2004:10:24:32 KST]
================================================================================
Sun Java(tm) System Message Queue
Sun Microsystems, Inc.
Version: 3.5 SP2 (Build 48-G)
Compile: Fri 08/27/2004
Copyright ? 2004 Sun Microsystems, Inc. All rights reserved.
Use is subject to license terms.
This product includes code licensed from RSA Data Security.
================================================================================
Java Runtime: 1.5.0 Sun Microsystems Inc. C:\Program Files\Java\jre1.5.0
[29/11월/2004:10:24:32 KST] IMQ_HOME=C:\_WEIRD\JMSServer\MessageQueue3
[29/11월/2004:10:24:32 KST] IMQ_VARHOME=C:\_WEIRD\JMSServer\MessageQueue3\var
[29/11월/2004:10:24:32 KST] Windows 2000 5.0 x86 pc01 (2 cpu) Administrator
[29/11월/2004:10:24:32 KST] Java Heap Size: max=195136k, current=16320k
[29/11월/2004:10:24:32 KST] Arguments:
[29/11월/2004:10:24:32 KST] [B1060]: Loading persistent data...
[29/11월/2004:10:24:32 KST] Using built-in file-based persistent store: C:\_WEIR
D\JMSServer\MessageQueue3\var\instances\imqbroker\
[29/11월/2004:10:24:33 KST] [B1039]: Broker "imqbroker@pc01:7676" ready.
[29/11월/2004:10:24:48 KST] ERROR [B3100]: Unexpected Broker Internal Error : [r
eceived unexpected exception ] :
java.lang.IllegalAccessError: tried to access field com.sun.messaging.jmq.io.Sys
MessageID.sequence from class com.sun.messaging.jmq.io.Packet
at com.sun.messaging.jmq.io.Packet.getSequence(Packet.java:394)
at com.sun.messaging.jmq.jmsserver.data.handlers.HelloHandler.handle(Hel
loHandler.java:261)
at com.sun.messaging.jmq.jmsserver.data.PacketRouter.handleMessage(Packe
tRouter.java:146)
at com.sun.messaging.jmq.jmsserver.service.imq.IMQConnection.readData(IM
QConnection.java:1747)
at com.sun.messaging.jmq.jmsserver.service.imq.IMQConnection.process(IMQ
Connection.java:791)
at com.sun.messaging.jmq.jmsserver.service.imq.OperationRunnable.process
(OperationRunnable.java:135)
at com.sun.messaging.jmq.jmsserver.util.pool.BasicRunnable.run(BasicRunn
able.java:455)
at java.lang.Thread.run(Unknown Source)
[29/11월/2004:10:24:48 KST] ERROR [B3100]: Unexpected Broker Internal Error : [r
eceived unexpected exception ] :
java.lang.IllegalAccessError: tried to access field com.sun.messaging.jmq.io.Sys
MessageID.port from class com.sun.messaging.jmq.io.Packet
at com.sun.messaging.jmq.io.Packet.setPort(Packet.java:721)
at com.sun.messaging.jmq.jmsserver.service.imq.IMQConnection.writeData(I
MQConnection.java:1852)
at com.sun.messaging.jmq.jmsserver.service.imq.IMQConnection.process(IMQ
Connection.java:778)
at com.sun.messaging.jmq.jmsserver.service.imq.OperationRunnable.process
(OperationRunnable.java:135)
at com.sun.messaging.jmq.jmsserver.util.pool.BasicRunnable.run(BasicRunn
able.java:455)
at java.lang.Thread.run(Unknown Source)
[29/11월/2004:10:29:24 KST] ERROR [B3100]: Unexpected Broker Internal Error : [r
eceived unexpected exception ] :
java.lang.IllegalAccessError: tried to access field com.sun.messaging.jmq.io.Sys
MessageID.port from class com.sun.messaging.jmq.io.Packet
at com.sun.messaging.jmq.io.Packet.setPort(Packet.java:721)
at com.sun.messaging.jmq.jmsserver.service.imq.IMQConnection.writeData(I
MQConnection.java:1852)
at com.sun.messaging.jmq.jmsserver.service.imq.IMQConnection.process(IMQ
Connection.java:778)
at com.sun.messaging.jmq.jmsserver.service.imq.OperationRunnable.process
(OperationRunnable.java:135)
at com.sun.messaging.jmq.jmsserver.util.pool.BasicRunnable.run(BasicRunn
able.java:455)
at java.lang.Thread.run(Unknown Source)
[29/11월/2004:10:29:24 KST] ERROR [B3100]: Unexpected Broker Internal Error : [r
eceived unexpected exception ] :
java.lang.IllegalAccessError: tried to access field com.sun.messaging.jmq.io.Sys
MessageID.sequence from class com.sun.messaging.jmq.io.Packet
at com.sun.messaging.jmq.io.Packet.getSequence(Packet.java:394)
at com.sun.messaging.jmq.jmsserver.data.handlers.HelloHandler.handle(Hel
loHandler.java:261)
at com.sun.messaging.jmq.jmsserver.data.PacketRouter.handleMessage(Packe
tRouter.java:146)
at com.sun.messaging.jmq.jmsserver.service.imq.IMQConnection.readData(IM
QConnection.java:1747)
at com.sun.messaging.jmq.jmsserver.service.imq.IMQConnection.process(IMQ
Connection.java:791)
at com.sun.messaging.jmq.jmsserver.service.imq.OperationRunnable.process
(OperationRunnable.java:135)
at com.sun.messaging.jmq.jmsserver.util.pool.BasicRunnable.run(BasicRunn
able.java:455)
at java.lang.Thread.run(Unknown Source)
and this is my simple progam..
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Hashtable;
import javax.jms.ObjectMessage;
import javax.jms.Session;
import javax.jms.TopicConnection;
import javax.jms.TopicPublisher;
import javax.jms.TopicSession;
import javax.naming.Context;
import com.sun.messaging.Topic;
import com.sun.messaging.TopicConnectionFactory;
public class TPublisher3 {
     public static void main(String[] args) {
          new TPublisher3().publish();
     public void publish() {
          BufferedReader reader = new BufferedReader(new InputStreamReader(
                    System.in));
          Hashtable env = new Hashtable();
          env.put(Context.INITIAL_CONTEXT_FACTORY,
                    "com.sun.jndi.fscontext.RefFSContextFactory");
          try {
               TopicConnectionFactory factory = new TopicConnectionFactory();
               Topic topic = new Topic();
               factory.setProperty("imqAddressList", "mq://localhost:7676/jms");
               factory.setProperty("imqConnectionURL", "");
               TopicConnection connection = factory.createTopicConnection("admin", "admin");
               TopicSession session = connection.createTopicSession(false,
                         Session.AUTO_ACKNOWLEDGE);
               TopicPublisher publisher = session.createPublisher(topic);
               System.out.println(factory.getCurrentConfiguration());
               String messageText = null;
               while (true) {
                    System.out.println("Enter message to send or 'quit':");
                    messageText = reader.readLine();
                    if ("quit".equals(messageText))
                         break;
                    ObjectMessage message = session.createObjectMessage(messageText);
          publisher.publish(message);
               //Exit
               reader.close();
               connection.close();
          } catch (Exception e) {
               e.printStackTrace();
               System.exit(1);
there is only one "Sun Java System Message Queue" in my system.
Thanks in advance.
BMK.

Answer 1

Have you copied or moved any imq related jar files
since the previous start of the broker ??
- specifically imq.jar
Have you made changes to your class path since the
last restart of the broker ?
I've seen this exception stack trace once before.
In that case, it was triggered by copying jar files
into the /usr/java/jre/lib/ext directory.
This problem occurs because there are a couple of
class files which are duplicated in two different jar
files ...
Here is what happened in that situation:
1. the vm starts up and loaed imq.jar from the ext
directory which contains SysMessageID
2. imqbrokerd then loads the user classes imqbroker.jar
and imqutil.jar from a different location.
These class files contain the Packet class (which
uses SysMessageID)
The ext directory is loaded by a different class loader ..
this means that Packet (loaded from imqbroker.jar) can
not legally access SysMessageID (and an exception is
thrown).
To fix this issue, remove the extra copy of the jar file from
the class path (or ext directory) or change the class path
(imq.jar was not designed to be a standard extension)
I belive that there is a bug filed against the product that
two different jar files should not contain the same
class ... but I havent located the bugid yet
I'll post the bug once I find it