Upgrade JBoss 5.1 from EL 2.1 to EL 2.2?

Question

This question is quick and simple.

JBoss 5.1 comes out of box supporting JSP and EL (Expression Language) 2.1 and Servlet 2.5.

Is it possible to upgrade or h

Answer 1

No, while replacing the libs is trivial, you'd after all have to redeclare the web.xml conform Servlet 3.0 to get it to work. This ain't going to be recognized by JBoss 5.1 (which is a Servlet 2.5 impl) without replacing all of its libraries to be the same as the ones in JBoss 6.0 (which is a Servlet 3.0 impl). It would be easier to just upgrade the whole thing to JBoss 6.0.

I understand that you're using JSF 2.0 (when looking at the old question tags). If the sole functional requirement is to support JSF backing bean action method invocations with arguments like as possible in EL 2.2, then your best bet is to drop a copy of JBoss-EL JAR file in /WEB-INF/lib of your webapp and add the following context param to your webapp's web.xml, assuming that you're using Mojarra.

<context-param>     
    <param-name>com.sun.faces.expressionFactory</param-name>
    <param-value>org.jboss.el.ExpressionFactoryImpl</param-value>   
</context-param>

No, it's not possible to configure it at JBoss level. You'd really have to do it at webapp level. For more about JBoss EL (which was the initiator behind invoking methods with arguments in EL), check chapter 34 of the Seam documentation.