C L U S T E R I N G  

Chapter  

5 

5. Clustering 

High Availability and Load Balancing Services by Bill 

Burke 

JBoss Clustering is the final piece of the puzzle that makes JBoss a true Enterprise Class 

application server.  With it's fail over, load balancing, and distributed deployment features, 

JBoss Clustering provides the means to develop large scalable robust J2EE applications. 

Features 

The following features are available in JBoss Clsutering. 

Automatic discovery.  Nodes in a cluster find each other with no additional 

configuration. 

Cluster wide replicated JNDI tree 

Fail over and load balancing for JNDI, RMI, and all EJB types. 

Stateful Session Bean state replication 

HttpSession state replication for Jetty and Tomcat 

Farming.  Distributed deployment of EJBs and JBoss services. 

Getting Started 

JBoss 3.0 comes with three different ready to use server configurations: minimal, default 

and all. Clustering is only enabled in this last configuration.  To make sure, look in JBoss' 

deploy directory of the  all  configuration for cluster service.xml.  Setting up your EJBs to be 

cluster enabled is as simple as setting a clustering flag in jboss.xml. 

jboss.xml 

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