I'm using richfaces and spring on jboss. I wanted to switch to jboss-EL, so I added:

 <context-param>
 <param-name>com.sun.faces.expressionFactory</param-name>
 <param-value>org.jboss.el.ExpressionFactoryImpl</param-value>
 </context-param>

to web.xml Howerver when I start server now I got:

12:25:50,046 FATAL [config] Error Instantiating ExpressionFactory
java.lang.ClassNotFoundException: No ClassLoaders found for: org.jboss.el.ExpressionFactoryImpl
 at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:212)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:514)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:408)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Class.java:169)
 at com.sun.faces.config.ConfigureListener.installExpressionFactory(ConfigureListener.java:1521)
 at com.sun.faces.config.ConfigureListener.registerELResolverAndListenerWithJsp(ConfigureListener.java:1540)
 at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:403)
 at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3854)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4359)
 at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:761)
 at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:741)
 at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:553)

I even added jar with jboss-el to lib folder and I can call it in Java code. I've tried to search about this problem and I found similar problem, but solution is for GlasFish: http://forums.java.net/jive/thread.jspa?messageID=297909
Anyone could help me with this one please?