However, I still suggest you try WebLogic 6.0 and IBM Webspehere 3.5.
Of course, it is difficult for you to run WebSphere at home. In addition, Jakarta-tomcat deserves your test-driving. The more you know, the future your career is. In IT industry, you need learn those influential softwares.
Employers are very stubborn. If they want to hire a person handle Weblogic, they won't trust you because you are an expert in using Jive.
If I were you, I would first try Jive and then migrate all of its examples to
Tomcat and weblogic.