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This exception has no message.
java.lang.NullPointerException: 	at org.jivesoftware.smack.SASLAuthentication.send(	at org.jivesoftware.smack.sasl.SASLMechanism.authenticate(	at org.jivesoftware.smack.SASLAuthentication.authenticate(	at org.jivesoftware.smack.XMPPConnection.login(	at org.jivesoftware.smack.XMPPConnection.login(	at org.jivesoftware.smack.RosterTest.testRosterPresences(	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at junit.framework.TestCase.runTest(	at junit.framework.TestCase.runBare(	at junit.framework.TestResult$1.protect(	at junit.framework.TestResult.runProtected(	at	at	at junit.framework.TestSuite.runTest(	at	at	at	at