Clustering numberguess example doesn't work

• Created cluster according to the readme
• Ran "mvn -Pjboss6cluster,ftest-jboss-cluster-6"
• The test failed:
  FAILED: guessingWithFailoverTest
  java.lang.AssertionError: Page should contain message Higher! expected:<true> but was:<false>
  at org.jboss.weld.examples.numberguess.clustertest.selenium.NumberGuessClusteringTest.guessingWithFailoverTest(NumberGuessClusteringTest.java:123)
  at org.apache.maven.surefire.testng.TestNGExecutor.run(TestNGExecutor.java:74)
  at org.apache.maven.surefire.testng.TestNGXmlTestSuite.execute(TestNGXmlTestSuite.java:92)
  at org.apache.maven.surefire.Surefire.run(Surefire.java:177)
  at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:345)
  at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1009)

And indeed, when running manually and shutting down one of the nodes in cluster, it failes to synchronize the session:

13:39:03,909 WARN [org.jboss.web.tomcat.service.session.distributedcache.ispn.DistributedCacheManager] Problem accessing session [3V****vgLw__]: org.jboss.weld.exceptions.IllegalStateException: WELD-000612 Unable to deserialize field. Declaring bean id org.jboss.weld.bean-jboss.classloader:id="vfs:///home/ony/Programming/jboss-6.0.0.Final/server/all/farm/weld-numberguess.war"-ManagedBean-class org.jboss.weld.examples.numberguess.Game, declaring class public@SessionScoped @Named class org.jboss.weld.examples.numberguess.Game, field name randomNumber