infinispan.DistributedCacheManagerTest unit tests fail with openjdk7

[INFO] 
[INFO] --- maven-resources-plugin:2.5:testResources (default-testResources) @ jboss-as-clustering-web-infinispan ---
[debug] execute contextualize
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /home/rhusar/git/jboss-as/clustering/web-infinispan/src/test/resources
[INFO] 
[INFO] --- maven-compiler-plugin:2.3.2:testCompile (default-testCompile) @ jboss-as-clustering-web-infinispan ---
[INFO] Compiling 6 source files to /home/rhusar/git/jboss-as/clustering/web-infinispan/target/test-classes
[INFO] 
[INFO] --- maven-surefire-plugin:2.11:test (default-test) @ jboss-as-clustering-web-infinispan ---
[INFO] Surefire report directory: /home/rhusar/git/jboss-as/clustering/web-infinispan/target/surefire-reports

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 T E S T S
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Running org.jboss.as.clustering.web.infinispan.FineSessionAttributeStorageTest
Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.334 sec
Running org.jboss.as.clustering.web.infinispan.CoarseSessionAttributeStorageTest
Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.011 sec
Running org.jboss.as.clustering.web.infinispan.DistributedCacheManagerTest
Tests run: 22, Failures: 2, Errors: 6, Skipped: 0, Time elapsed: 0.42 sec <<< FAILURE!
Running org.jboss.as.clustering.web.infinispan.SimpleExternalizerTestCase
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.004 sec
Running org.jboss.as.clustering.web.infinispan.SessionAttributeStorageFactoryTest
Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.002 sec
Running org.jboss.as.clustering.web.infinispan.SessionMapEntryTest
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.009 sec

Results :

Failed tests:   getSessionDataNoOwner(org.jboss.as.clustering.web.infinispan.DistributedCacheManagerTest): expected same:<Mock for IncomingDistributableSessionData, hashCode: 1688182366> was not:<null>
  getMissingSessionDataNoOwner(org.jboss.as.clustering.web.infinispan.DistributedCacheManagerTest): expected same:<Mock for IncomingDistributableSessionData, hashCode: 981356300> was not:<null>

Tests in error: 
  removeSession(org.jboss.as.clustering.web.infinispan.DistributedCacheManagerTest): (..)
  removeSessionLocal(org.jboss.as.clustering.web.infinispan.DistributedCacheManagerTest): (..)
  removeSessionLocalNoOwner(org.jboss.as.clustering.web.infinispan.DistributedCacheManagerTest): (..)
  evictSession(org.jboss.as.clustering.web.infinispan.DistributedCacheManagerTest): (..)
  evictSessionNoOwner(org.jboss.as.clustering.web.infinispan.DistributedCacheManagerTest): (..)
  getSessionIds(org.jboss.as.clustering.web.infinispan.DistributedCacheManagerTest)

Tests run: 33, Failures: 2, Errors: 6, Skipped: 0