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A documentum 6.5SP2 project works with Tomcat and Weblogic, but when deploy in JBOSS 5.1. I got such error. I found that it is dfc.jar version issue. JBoss 5.1 only supports dfc.jar 6.7+. Using dfc.jar 6.5, 6.5 SP1, 6.5 SP2, 6.6, we got the ‘java.lang.NoClassDefFoundError: Could not initialize class com.documentum.fc.client.DfClient’.

Using dfc.jar 6.7, 6.7SP1, 6.7SP2,  7.0, it works well.

java.lang.NoClassDefFoundError: Could not initialize class com.documentum.fc.client.DfClient    at com.generiscorp.cara.dctm.api.impl.CaraRepositoryFactory.getAvailableRepositories(CaraRepositoryFactory.java:123)    at com.generiscorp.cara.desktop.server.facade.RepositoryFacade.getRepositories(RepositoryFacade.java:57)    at com.generiscorp.cara.web.dctm.common.server.AuthenticationServiceImpl.getRepositories(AuthenticationServiceImpl.java:111)Fatal error during session manager initialization java.lang.ExceptionInInitializerError    at com.documentum.fc.client.DfClient.
   
    (DfClient.java:700)    at com.documentum.com.DfClientX.getLocalClient(DfClientX.java:43)Caused by: java.lang.NullPointerException    at java.util.Hashtable.put(Hashtable.java:394)    at com.documentum.fc.common.impl.preferences.PreferencesManager.readPersistentProperties(PreferencesManager.java:321)    at com.documentum.fc.common.impl.preferences.PreferencesManager.
    
     (PreferencesManager.java:37)    at com.documentum.fc.common.DfPreferences.initialize(DfPreferences.java:79)    at com.documentum.fc.common.DfPreferences.getInstance(DfPreferences.java:58)    at com.documentum.fc.impl.RuntimeContext.
     
      (RuntimeContext.java:177)
     
    
   

more:

-Djboss.vfs.forceVfsJar=true

if you deploy it as a war file not a war folder, add the start parameter to avoid the Exception.

jboss vfs refer to http://docs.jboss.org/jbossas/docs/Installation_And_Getting_Started_Guide/5/html/ch01.html#d0e495

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