Hi there, I'm using PojoCacheMBean with JBoss AS. In the deploy\mycache-service.xml, I use the following lines to add the pojocache service: <mbean code="org.jboss.cache.aop.PojoCache" | name="jboss.cache:service=testPojoCache"> In the java code, I use the following lines to get the cache object: MBeanServer server=MBeanServerLocator.locateJBoss(); | cache_=(PojoCacheMBean)MBeanProxyExt.create(PojoCacheMBean.class, "jboss.cache:service=testPojoCache", server); To get an object in the cache: PojoCacheMBean cache = BaseCacheManager.getCache(); | String fqnStr = "/test"; | Fqn fqn = Fqn.fromString(fqnStr); | Object obj = cache.getObject(fqn); Then I got the following exception, which is caused by the line "Object obj = cache.getObject(fqn) " : java.lang.IllegalArgumentException: argument type mismatch | -------------------------------------------------------------------------------- | java.lang.IllegalArgumentException: argument type mismatch | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) | at sun.reflect.NativeMethodAccessorImpl.invoke NativeMethodAccessorImpl.java:39) | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) | at java.lang.reflect.Method.invoke(Method.java:585) | at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) | at org.jboss.mx.server.Invocation.invoke(Invocation.java:86) | at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264) | at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) | at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176) | at $Proxy65.gutObject(Unknown Source) | at com.letu.netprint.modules.bos.base.BaseBO.getObject(BaseBO.java:280) If I change the last line from Object obj = cache.getObject(fqn); to Object obj = cache.getObject(fqnStr); Thinks become OK. Why this could happen? My evironment is : jdk1.5.0_09 jboss-4.0.4.GA jboss-cache.jar is from JBossCache-1.4.0.SP1 Any help or remind will be very appreciating, thanks in advance! Steven Si View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3976036#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...