Encountering "java.lang.SecurityException: Unauthenticated caller:null" in EAP 5

Issue

• Using a custom login module for database authentication which encodes both the username and password
• Encountering the error below when attempting to obtain a database connection

java.lang.SecurityException: Unauthenticated caller:null
    at org.jboss.security.integration.JBossSecuritySubjectFactory.createSubject(JBossSecuritySubjectFactory.java:92)
    at org.jboss.resource.connectionmanager.BaseConnectionManager2.getSubject(BaseConnectionManager2.java:687)
    at org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateConnection(BaseConnectionManager2.java:495)
    at org.jboss.resource.connectionmanager.BaseConnectionManager2$ConnectionManagerProxy.allocateConnection(BaseConnectionManager2.java:941)
    at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:96)
    ...