I've seen this with Oracle jdbc objects. If you have classes12.jar in your WEB-INF/lib directory, and a copy in common/lib (for the Tomcat Datasource) then you will have TWO oracle.jdbc.XX classes loaded, one in the common classloader and on in your web app's classloader and although they are both oracle.jdbc.XX, they are not the SAME class object (instance).
So, be certain your interface X is not in two visible places. Or if it is, you cannot cast objects from one classloader to the other. Tim -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Thursday, April 06, 2006 10:10 AM To: users@tomcat.apache.org Subject: crossContext breaking class hierarchy? 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. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
