SSLSocketsUnitTestCase fails when tries to remove Identities

Error Message

RuntimeException; nested exception is: java.lang.UnsupportedOperationException
Stacktrace

java.rmi.ServerException: RuntimeException; nested exception is:
java.lang.UnsupportedOperationException
at org.jboss.ejb.plugins.LogInterceptor.handleException(LogInterceptor.java:421)
at org.jboss.ejb.plugins.LogInterceptor.invokeHome(LogInterceptor.java:136)
at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invokeHome(ProxyFactoryFinderInterceptor.java:107)
at org.jboss.ejb.SessionContainer.internalInvokeHome(SessionContainer.java:639)
at org.jboss.ejb.Container.invoke(Container.java:1109)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:157)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668)
at org.jboss.invocation.pooled.server.PooledInvoker$MBeanServerAction.invoke(PooledInvoker.java:896)
at org.jboss.invocation.pooled.server.PooledInvoker.invoke(PooledInvoker.java:383)
at org.jboss.invocation.pooled.server.ServerThread.processInvocation(ServerThread.java:233)
at org.jboss.invocation.pooled.server.ServerThread.dorun(ServerThread.java:275)
at org.jboss.invocation.pooled.server.ServerThread.run(ServerThread.java:156)
Caused by: java.lang.UnsupportedOperationException
at java.util.Collections$UnmodifiableCollection.removeAll(Collections.java:1088)
at org.jboss.security.SecurityContextUtil.clearIdentities(SecurityContextUtil.java:152)
at org.jboss.ejb.plugins.SSLSessionInterceptor.extractSessionPrincipal(SSLSessionInterceptor.java:122)
at org.jboss.ejb.plugins.SSLSessionInterceptor.invokeHome(SSLSessionInterceptor.java:61)
at org.jboss.ejb.plugins.LogInterceptor.invokeHome(LogInterceptor.java:132)

http://grepcode.com/file/repository.jboss.org/nexus/content/repositories/releases/org.picketbox/picketbox-spi-bare/3.0.0.CR2/org/jboss/security/SecurityContextUtil.java#152

(picketbox, not yet sure where this comes from in EAP5 )