Hello,
I am experiencing a problem with Tomcat and class hierarchies. In
particular when an object (which implements interface X) is shared among
serveral contexts I am unable to cast the object back into interface X.
Here is the setup (for simplicity I'll illustrate this with 2 contexts):
* Interface "ClassInterface" is distributed across all applications in a
.jar.
Application A in context a
--------------------------
- Implements ClassInterface and adds an instance of the class in it's
context:
ClassInterface i = new ClassInterfaceImplementation();
getServletContext().setAttribute("some.key", i);
Application B in context b
--------------------------
- Tries to cast the object in the context back into a ClassInterface but
fails with a classCastException: ClassInterfaceImplementation
ServletContext context = (ServletContext)
getServletContext.getContext("/a");
ClassInterface i = (ClassInterface) context.getAttribute("some.key");
-- EXCEPTION IS THROWN --
java.lang.ClassCastException: ClassInterfaceImplementation
Has anybody experienced this before? Does setting an attribute in the
context mess things up with the class hierarchy?
Thanks.
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