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Classloader Diffculties with JBoss

Classloader Diffculties with JBoss

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When you deploy two Web applications as Web archives (WARs) into JBoss’ deploy folder, you expect them to run independently of each other. But this does not happen.

WebApp1.war  + WEB-INF     + lib        + abc_v1.0.jar     + classes        + com.abc.Class_v1.0WebApp2.war  + WEB-INF     + lib        + abc_v1.1.jar     + classes        + com.abc.Class_v1.1

If you deploy the two Web applications in the above structure, one of them will break. This is because JBoss/Tomcat5 classloading mechanism’s class loader is used by all applications?even when they are in different WAR files.

The solution is to change the deployjbossweb-tomcat50.sarMETA-INFjboss-service.xml file. If you change the UseJBossWebLoader attribute to false, a different classloader will be used for different WAR files.

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