accessing TreeCacheMBean from remote client

[ppradhan]

Hi,

I have been using the TreeCache for a while. It gets deployed ok and I can access it fine from my classes within the ear as well as from the JMX console. However, I am having trouble getting to the TreeCacheBean from a java client outside the ear.

I have looked at the documentation for cache (chapter 12) and
http://wiki.jboss.org/wiki/Wiki.jsp?page=HowDoIGetRemoteAccessToMyMBean

Does anybody have a simple example for how to use the RMIAdaptor for TreeCacheMBean?

Thanks

[brian.stansberry]

See http://labs.jboss.com/file-access/default/members/jbosscache/freezone/docs/1.4.0/TreeCache/en/html/jboss_integration.html

The bit in section 13.1 shows how to bind a proxy to your cache into JNDI; external clients can look it up and access it that way.

If the client is outside the ear but in the AS, you can use the JMX proxy technique shown just a bit above section 13.1.

[ppradhan]

Hi,

1. the jboss-service.xml has this:

<attribute name="TargetName">
 jboss.cache:service=TreeCache
 </attribute>
 <attribute name="JndiName">
 MyCache
 </attribute>
 <attribute name="InvokeTargetMethod">
 true
 </attribute>
 <attribute name="ExportedInterface">
 org.jboss.cache.TreeCacheMBean
 </attribute>

fyi: I am using old version of cache (1.2.3) but that should not matter here I think.

2. My client code is:

Properties env = new Properties();
 env.put(Context.INITIAL_CONTEXT_FACTORY,
 "org.jnp.interfaces.NamingContextFactory");
 env.put("java.naming.factory.url.pkgs",
 "org.jboss.naming:org.jnp.interfaces");
 env.pu(Context.PROVIDER_URL, "jnp://localhost:1099");
 Context ctx = new InitialContext (env);
 //following http://wiki.jboss.org/wiki/Wiki.jsppage=JMXMBeanRemoteProxy

line#51=> cache = (TreeCacheMBean)ctx.lookup("MyCache");

3. I still get following exception:

Exception in thread "main" java.lang.NoClassDefFoundError: org/jgroups/ChannelClosedException
 at java.lang.Class.getDeclaredMethods0(Native Method)
 at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
 at java.lang.Class.privateGetPublicMethods(Unknown Source)
 at java.lang.Class.getMethods(Unknown Source)
 at sun.misc.ProxyGenerator.generateClassFile(Unknown Source)
 at sun.misc.ProxyGenerator.generateProxyClass(Unknown Source)
 at java.lang.reflect.Proxy.getProxyClass(Unknown Source)
 at sun.rmi.server.LoaderHandler.loadProxyClass(Unknown Source)
 at sun.rmi.server.LoaderHandler.loadProxyClass(Unknown Source)
 at sun.rmi.server.LoaderHandler.loadProxyClass(Unknown Source)
 at java.rmi.server.RMIClassLoader$2.loadProxyClass(Unknown Source)
 at java.rmi.server.RMIClassLoader.loadProxyClass(Unknown Source)
 at sun.rmi.server.MarshalInputStream.resolveProxyClass(Unknown Source)
 at java.io.ObjectInputStream.readProxyDesc(Unknown Source)
 at java.io.ObjectInputStream.readClassDesc(Unknown Source)
 at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
 at java.io.ObjectInputStream.readObject0(Unknown Source)
 at java.io.ObjectInputStream.readObject(Unknown Source)
 at java.rmi.MarshalledObject.get(Unknown Source)
 at org.jnp.interfaces.MarshalledValuePair.get(MarshalledValuePair.java:57)
 at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:637)
 at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:572)
 at javax.naming.InitialContext.lookup(Unknown Source)
 at gov.lbl.pss2.cache.test.Test.main(Test.java:51)

Any pointers, insights?

Thanks

[brian.stansberry]

You need to have jgroups.jar on the client classpath. TreeCacheMBean includes this method:

void fetchState(long timeout) throws org.jgroups.ChannelClosedException, org.jgroups.ChannelNotConnectedException;

which is quite poor, but is still around in JBC 1.x to preserve API compatibility.[/url]