Apologies, I get that exception only on my own queues.  The mdb example gives 
the following exception:

The ant task outputs the following

  | Buildfile: build.xml
  | 
  | identify:
  |      [echo] 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
  |      [echo] X                        Running the MDB example                
          X
  |      [echo] 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
  |      [echo] The queue: testQueue
  | 
  | sanity-check:
  | 
  | init:
  | 
  | compile:
  | 
  | jar:
  | 
  | deploy:
  |      [copy] Copying 1 file to C:\java\jboss-4.0.1SP1\server\messaging\deploy
  | 
  | sleep:
  |      [echo] Sleeping for 5 seconds ...
  | 
  | run:
  | 
  | send:
  |      [java] java.lang.UnsupportedClassVersionError: 
org/jboss/example/jms/mdb/Sender (Unsupported major.minor version 49.0)
  |      [java]     at java.lang.ClassLoader.defineClass0(Native Method)
  |      [java]     at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
  |      [java]     at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
  |      [java]     at 
java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
  |      [java]     at 
java.net.URLClassLoader.access$100(URLClassLoader.java:55)
  |      [java]     at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
  |      [java]     at java.security.AccessController.doPrivileged(Native 
Method)
  |      [java]     at 
java.net.URLClassLoader.findClass(URLClassLoader.java:187)
  |      [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
  |      [java]     at 
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
  |      [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
  |      [java]     at 
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
  |      [java] Exception in thread "main"
  | 
  | BUILD FAILED
  | C:\java\jboss-messaging-1.0.1.CR1\examples\mdb\build.xml:95: The following 
error occurred while executing this line:
  | C:\java\jboss-messaging-1.0.1.CR1\examples\mdb\build.xml:104: Java 
returned: 1
  | 

The jboss server outputs the following:


  | 17:17:00,748 WARN  [verifier] EJB spec violation:
  | Bean   : MDBExample
  | Section: 22.2
  | Warning: The Bean Provider must specify the fully-qualified name of the 
Java class that implements the enterprise bean's business methods in the 
<ejb-class> element.
  | Info   : Class not found on 'org.jboss.example.jms.mdb.MDBExample': 
Unexpected error during load of: org.jboss.example.jms.mdb.MDBExample, 
msg=org/jboss/example/jms/mdb/MDBExample (Unsupported major.m
  | inor version 49.0)
  | 
  | 17:17:00,748 ERROR [MainDeployer] could not create deployment: 
file:/C:/java/jboss-4.0.1sp1/server/messaging/deploy/mdb-example.jar
  | org.jboss.deployment.DeploymentException: Verification of Enterprise Beans 
failed, see above for error messages.
  |         at org.jboss.ejb.EJBDeployer.create(EJBDeployer.java:553)
  |         at org.jboss.deployment.MainDeployer.create(MainDeployer.java:918)
  |         at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:774)
  |         at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:738)
  |         at sun.reflect.GeneratedMethodAccessor45.invoke(Unknown Source)
  |         at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  |         at java.lang.reflect.Method.invoke(Method.java:324)
  |         at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:144)
  |         at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
  |         at 
org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:122)
  |         at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
  |         at 
org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:131)
  |         at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
  |         at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:249)
  |         at 
org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
  |         at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
  |         at $Proxy8.deploy(Unknown Source)
  |         at 
org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:305)
  |         at 
org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:481)
  |         at 
org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:204)
  |         at 
org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.loop(AbstractDeploymentScanner.java:215)
  |         at 
org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.run(AbstractDeploymentScanner.java:194)
  | 


Both appear to point to code that was compiled on java 1.5 in teh CR1 release.  
Is there something special I need to do in order to use CR1 on jdk 1.4.2_08?

Thanks,
JB

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