Cannot call the execute command from java code

Hello,
I like to add a new user via a java web service.
Establishing a connection to the OC4J MBean server is no problem. I also can execute the commands 'listAllCommands' and 'help' on the MBean. But if i try to call the execute command, i always get an NoSuchMethodException. Looking at the MBeanInfos 'execute' is listed there as an operation.
Can anyone explain this to me?

Hi,
I basically used the code described at http://download.oracle.com/docs/cd/B32110_01/web.1013/b28952/mbeans.htm#CIHFDJBJ to connect to the MBeanServer.
To invoke 'execute' i used
MBeanServerConnection con= jmxCon.getMBeanServerConnection();
con.invoke(new ObjectName(MBEAN_NAME), "execute", new Object[] { COMMAND }, new String[] {});
where MBEAN_NAME is the ObjectName of the CommandService MBean and COMMAND is a String like "identity add ..."

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