PojoCacheMBean getObject(fqn); throws java.lang.IllegalA

[sting_hz]

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

[brian.stansberry]

Is there more than one copy of jboss-cache.jar on the classpath? The jboss-cache.jar from 1.4.0.SP1 should replace the one in server/.../lib.

That's just a guess, and probably not a good one :(

[brian.stansberry]

I noticed this in your stack trace:

at $Proxy65.gutObject(Unknown Source)

Note it's "gutObject" not "getObject". Was that really in the original stack trace, or did it get altered somehow?

[sting_hz]

Hi Brian,

Thanks for your info.

There's same jboss-cache.jar both under web-inf/lib and server/all/lib, so I removed the one under web-inf/lib.

Then I got another exception,

java.lang.IllegalArgumentException: interface org.jboss.mx.util.MBeanProxyInstance is not visible from class loader
at java.lang.reflect.Proxy.getProxyClass(Proxy.java:353)
at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:581)
at org.jboss.mx.util.MBeanProxyExt.create(MBeanProxyExt.java:345)
at org.jboss.mx.util.MBeanProxyExt.create(MBeanProxyExt.java:308)
at org.jboss.mx.util.MBeanProxyExt.create(MBeanProxyExt.java:283)
at com.letu.netprint.util.cache.BaseCacheManager.initCache(BaseCacheManager.java:101)
at com.letu.netprint.util.cache.BaseCacheManager.getCache(BaseCacheManager.java:120)
...

The stack trace is related with this code:

MBeanServer server=MBeanServerLocator.locateJBoss();
cache_=(PojoCacheMBean)MBeanProxyExt.create(PojoCacheMBean.class, "jboss.cache:service=testPojoCache", server);

Seems it has problem to create the cache object now. Am I moving backward?

Thanks,

Steven

[sting_hz]

yes,
:
at $Proxy65.gutObject(Unknown Source)

it should be getObject , I made a mistake when editing the post.

[brian.stansberry]

If you added any other jars from the JBoss Cache dist to WEB-INF/lib, get rid of those as well -- they are all already on the classpath in the AS and a second copy will screw things up.

[sting_hz]

I've removed thoese jboss cache dist jars from the web-inf/lib as you said,

but the exception is still there:
java.lang.IllegalArgumentException: interface org.jboss.mx.util.MBeanProxyInstance is not visible from class loader
...

[brian.stansberry]

Well, the line numbers in your stack trace above are from a 4.0.3 version of jboss-jmx.jar, not the 4.0.4.GA version. So, there's any extra copy of that jar somewhere. Perhaps you copied it to server/all/lib?

The only thing to do to upgrade 4.0.4.GA to use JBC 1.4.0.SP1 is to replace jboss-cache.jar in server/all/lib. If you put any other jars from the JBC distribution on the classpath anywhere, you should undo that change.

[sting_hz]

Hi Brian ,
Thank you very much!

The error is because I also copied and overided the jboss-j2ee.jar to the /server/all/lib.

Now it runs! :)

Steven