NullPointerException when setting Trace Logging in JBoss

Issue

• When turning on trace logging on

  <category name="org.jboss.security">
    <priority value="TRACE" />
  </category>
  

We got a NullPointerException (NPE) from org.jboss.security.auth.login.XMLLoginConfigImpl, need to add this line to work around this issue:

<category name="org.jboss.security.auth.login.XMLLoginConfigImpl">
  <priority value="DEBUG" />
</category>

• NPE seen in the log:

java.lang.NullPointerException
        at org.jboss.security.auth.login.AuthenticationInfo.toString(AuthenticationInfo.java:107)
        at java.lang.String.valueOf(String.java:2826)
        at java.lang.StringBuilder.append(StringBuilder.java:115)
        at org.jboss.security.auth.login.XMLLoginConfigImpl.getAppConfigurationEntry(XMLLoginConfigImpl.java:156)
        at javax.security.auth.login.LoginContext.init(LoginContext.java:243)
        at javax.security.auth.login.LoginContext.<init>(LoginContext.java:367)
        at javax.security.auth.login.LoginContext.<init>(LoginContext.java:444)
        at org.jboss.security.plugins.auth.SubjectActions$LoginContextAction.run(SubjectActions.java:170)
        at org.jboss.security.plugins.auth.SubjectActions$LoginContextAction.run(SubjectActions.java:156)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.jboss.security.plugins.auth.SubjectActions.createLoginContext(SubjectActions.java:324)
        at org.jboss.security.plugins.auth.JaasSecurityManagerBase.defaultLogin(JaasSecurityManagerBase.java:552)

       ...