"SecurityException: unable to instantiate Subject-based policy" on JBoss EAP 6 when creating database connections

Issue

We see a ExceptionInInitializerError error from the "JCA Pool filler thread"

Exception in thread "JCA PoolFiller" java.lang.ExceptionInInitializerError
    at javax.security.auth.Subject$2.run(Subject.java:533)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.createContext(Subject.java:526)
    at javax.security.auth.Subject.doAs(Subject.java:396)
    at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:246)
    at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.createConnectionEventListener(SemaphoreArrayListManagedConnectionPool.java:842)
    at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.fillToMin(SemaphoreArrayListManagedConnectionPool.java:783)
    at org.jboss.jca.core.connectionmanager.pool.mcp.PoolFiller.run(PoolFiller.java:97)
    at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.SecurityException: unable to instantiate Subject-based policy
    at javax.security.auth.Policy.getPolicyNoCheck(Policy.java:224)
    at javax.security.auth.Policy.getPolicy(Policy.java:181)
    at javax.security.auth.SubjectDomainCombiner$5.run(SubjectDomainCombiner.java:481)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.SubjectDomainCombiner.compatPolicy(SubjectDomainCombiner.java:477)
    at javax.security.auth.SubjectDomainCombiner.<clinit>(SubjectDomainCombiner.java:47)
    ...