Hi, Thanks for your response, I tries to create a new RpcTreeCache and call my method... but it doesn't work again with the same exception. XmlConfigurationParser parser = new XmlConfigurationParser(); | Configuration conf = parser.parseFile( "cache-config.xml" ); | TimerSessionValidity timer = new TimerSessionValidity("maxime","id"); | | RpcTreeCache rpcCache = new RpcTreeCache(); | rpcCache.setConfiguration(conf); | rpcCache.start(); | | Method method = timer.getClass().getMethod("pingSession2",new Class[]{String.class}); | rpcCache.registerRPCHandler("timer", timer); | rpcCache.callRemoteMethods("timer",rpcCache.getMembers(), method,new Object[]{ "maxime"}, false, false, (long) 1000); Could you give a simple code example of RPC calls ??? Because I am lost. Many Thanks View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3982974#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...