JBossWSCoreAllTests testWSProviderInvokeCommand and other WS tests fails on hudson

http://hudson.qa.jboss.com/hudson/job/jbosstools-nightly-3.1.0.Alpha1/184/testReport/(root)/JBossWSCoreAllTests/testWSProviderInvokeCommand/

Error Message
Error: Could not generate. (use --show-traces to see full traces) Error: com/sun/codemodel/JExpression
Stacktrace
junit.framework.AssertionFailedError: Error: Could not generate. (use --show-traces to see full traces)
Error: com/sun/codemodel/JExpression
at org.jboss.tools.ws.core.test.command.JBossWSJavaFirstCommandTest.testWSProviderInvokeCommand(JBossWSJavaFirstCommandTest.java:142)
at org.eclipse.test.EclipseTestRunner.run(EclipseTestRunner.java:354)
at org.eclipse.test.EclipseTestRunner.run(EclipseTestRunner.java:206)
at org.eclipse.test.UITestApplication$3.run(UITestApplication.java:195)

2 more is viewable from http://hudson.qa.jboss.com/hudson/job/jbosstools-nightly-3.1.0.Alpha1/184/testReport/