E.g. in http://jenkins.mw.lab.eng.bos.redhat.com/hudson/job/JBoss-AS-7.1.x-testSuite-sun16/2528

Running org.jboss.as.txn.TransactionSubsystemTestCase
Resolving artifact org.jboss.as:jboss-as-transactions:jar:7.1.2.Final
Resolved artifact org.jboss.as:jboss-as-transactions:jar:7.1.2.Final from jboss-developer (http://repository.jboss.org/nexus/content/groups/developer/, releases+snapshots)
/home/hudson/.m2/repository/org/jboss/as/jboss-as-transactions/7.1.2.Final/jboss-as-transactions-7.1.2.Final.jar
Tests run: 2, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 1.74 sec <<< FAILURE!

Results :

Tests in error:
testTransformers(org.jboss.as.txn.TransactionSubsystemTestCase): java.lang.NoClassDefFoundError: com/vladium/emma/rt/RT
testSubsystem(org.jboss.as.txn.TransactionSubsystemTestCase): java.lang.NoClassDefFoundError: Could not initialize class org.jboss.as.txn.subsystem.TxStatsHandler

Tests run: 2, Failures: 0, Errors: 2, Skipped: 0