There are 2 tests in the clustering unit tests in the AS7 source code which are using Arquillian's byteman extension which fail when running on IBM JDK 7. Because of this it is not possible to compile AS7 with IBM JDK7 unless the unit tests are skipped by -DskipTests.

Affected tests:
clustering/infinispan/src/test/java/org/jboss/as/clustering/infinispan/subsystem/OperationSequencesTestCase.java
clustering/jgroups/src/test/java/org/jboss/as/clustering/jgroups/subsystem/OperationSequencesTestCase.java

The issue affects both IBM JDK6 and JDK7.