Documentum based Application throws NullPointerException in JBoss

Issue

• A Documentum API based application runs fine in JBoss EAP 4.3 but when deployed on JBoss EAP 5.1.1 and 5.0 then it gets failed in dfc client with the following error:

13:12:21,333 ERROR [[TestApp Application]] Servlet.service() for servlet TestApp Application threw exception
java.lang.NullPointerException
        at java.util.Hashtable.put(Unknown Source)
        at com.documentum.fc.common.impl.preferences.PreferencesManager.readPersistentProperties(PreferencesManager.java:321)
        at com.documentum.fc.common.impl.preferences.PreferencesManager.<init>(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.<clinit>(RuntimeContext.java:177)
        at com.documentum.fc.client.DfClient.<clinit>(DfClient.java:700)
        at com.documentum.com.DfClientX.getLocalClient(DfClientX.java:43)