Negotiation toolkit Secured test fails with NullPointerException in EAP 6.1

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Issue

JBoss Negotiation Toolkit's 3rd test, Secured, works the first time, then fails with NullPointerException when tested again.
During connection to our Active Directory with jboss-negotiation-toolkit, Basic Negotiation and Security Domain Test were successful but the error occurred when running Secured Test.

Environment

Red Hat JBoss Enterprise Application Platform (EAP)
- 6.1.0
JBoss Negotiation Toolkit
SPNEGO Authentication

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