J2ee/J2e complancy and JBoss 5 instances

[willemnoorduin]

When you look at ${JBOSS_HOME}/server, you see the following instance (templetes):

• default
• all
• standard
• poduction (only in the Enterprise Edition)
• minimal
• web

Of these, the instances {default, production, minimal, web} are optimized for porfermance. A couple of days ago, some friends of mine came back from a JBoss training with the fact, that only standard is J2E compliant and the rest of the instances are failing because of altered class-loading characteristic. My questions are:

1. Is this true for the mentioned instances (thus, is stabdard the only J2E compliant instance) ?
2. What could I take for a cluster aware J2E compliant instance ?
3. If there is no template for a cluster aware J2E compliant instance, what are the steps to add things to standard to make it into a cluster aware J2E compliant instance ?
4. How to check J2E compliancy ?

[mp911de]

Hi Willem,

JBoss is J2EE compliant, perhaps the most compliant available App-Server :-) See certification under http://www.oracle.com/technetwork/java/javaee/overview/compatibility-javaee5-jsp-141098.html

Like all J2EE-Servers also JBoss AS has some non-standard features (like jboss-*.xml/-ds.xml/-service.xml-Files), in which you can configure additional stuff.

The all-Template contains a well configured Cluster-Template, but you need in each case a customization of the current config-files. You also could take the minimal-Template and add needed deployers and config Items to build your own Cluster - this would take sure a bit more than 10 minutes...

You'll find additional Information about Class-Loading at http://community.jboss.org/wiki/jbossclassloadingusecases and http://community.jboss.org/wiki/classloadingconfiguration

Hope I could help you. Best regards,

Mark

[wdfink]

Additional to Mark's hints, JEE compliant is to use 'call by value' which is used by the standard configuration, but the optimization is to use 'call by reference' for a better performance.

This is quite useful, but indeed not conform to the JEE spec and you must respect it in your code otherwise you might have unexpected results.