Java EE (Java Enterprise Edition) General Discussion

I'm writing ejb whith jbuilder7 for weblogic6.
I wrote a local session bean, and invoke it in a jsp.When I access the jsp, I get a ClassCastException exception.Here is the exception:

    java.lang.ClassCastException: myejb.CounterBean_cp0o42_LocalHomeImpl

myejb.CounterBean_cp0o42_LocalHomeImpl generated by EJBC, implemnts the local session bean LocalHome interface.

Here is my lookup code:

	Context ctx = new InitialContext();
	Object ref = ctx.lookup("CounterLocal");
	CounterLocalHome home = (CounterLocalHome)ref;

Why?
tell me the reason,pls.