Map does support key values that are not String ----------------------------------------------- Key: JBCACHE-496 URL: https://issues.jboss.org/browse/JBCACHE-496 Project: JBoss Cache Issue Type: Bug Security Level: Public(Everyone can see) Components: Legacy POJO Cache Affects Versions: 1.2.4SP1 Environment: Suse Linux Reporter: Scott Marlow (Novell) Assignee: Scott Marlow Fix For: 1.3.0.GA Map hobbies = ...; // obtained from cache; public void testLongValue() throws Throwable { Long val = new Long("8225676592564383"); hobbies.put(val, "prateek"); // the following two calls will fail assertTrue(hobbies.containsKey(val)); assertTrue(hobbies.get(val).equals("prateek")); }