Accessing an EJB1.1 entity with composite primary key result in JBAS014268

Issue

• Accessing an attribute on an EJB1.1 entity with a composite primary key results in the following error:

  ERROR [org.jboss.as.ejb3] (ServerService Thread Pool -- 61) JBAS014268: Failure in caller transaction.: javax.ejb.EJBException: JBAS018651: Internal error getting primary key field member firstId
      at org.jboss.as.cmp.jdbc.bridge.JDBCAbstractCMPFieldBridge.getPrimaryKeyValue(JDBCAbstractCMPFieldBridge.java:240) [jboss-as-cmp-7.5.13.Final-redhat-2.jar:7.5.13.Final-redhat-2]
  ...
  Caused by: java.lang.IllegalArgumentException: Can not set java.math.BigDecimal field org.jboss.jbaesner.playground.ejb2.cmp.PlaygroundPK.firstId to org.jboss.jbaesner.playground.ejb2.cmp.PlaygroundPK
      at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167) [rt.jar:1.8.0_111-debug]
      at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171) [rt.jar:1.8.0_111-debug]
      at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:58) [rt.jar:1.8.0_111-debug]
      at sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:36) [rt.jar:1.8.0_111-debug]
      at java.lang.reflect.Field.get(Field.java:393) [rt.jar:1.8.0_111-debug]
      at org.jboss.as.cmp.jdbc.bridge.JDBCAbstractCMPFieldBridge.getPrimaryKeyValue(JDBCAbstractCMPFieldBridge.java:233) [jboss-as-cmp-7.5.13.Final-redhat-2.jar:7.5.13.Final-redhat-2]
      ... 153 more