The JDO specification (2.1 page 218 "Table 8: Default jdbc-type") specifies the default Java boolean mapping is JDBC BIT. However, DataNucleus 1.1.3 complains not supported on DB2. Maybe DataNucleus can be improved to simulate BIT Number type w/ SmallInt which is the closest Number type on DB2.

NFO: >> Exception thrown persisting objects
Throwable occurred: javax.jdo.JDOFatalInternalException: JDBC type BIT declared for field "org.datanucleus.test.Bool.bool" of java type java.lang.Boolean cant be mapped for this datastore.
  at org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:399)
  at org.datanucleus.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:674)
  at org.datanucleus.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:694)
  at org.datanucleus.test.Main.main(Main.java:52)
NestedThrowablesStackTrace:
JDBC type BIT declared for field "org.datanucleus.test.Bool.bool" of java type java.lang.Boolean cant be mapped for this datastore.
org.datanucleus.exceptions.NucleusException: JDBC type BIT declared for field "org.datanucleus.test.Bool.bool" of java type java.lang.Boolean cant be mapped for this datastore.
  at org.datanucleus.store.rdbms.mapping.RDBMSMappingManager.getDatastoreMappingClass(RDBMSMappingManager.java:325)
  at org.datanucleus.store.rdbms.mapping.RDBMSMappingManager.createDatastoreMapping(RDBMSMappingManager.java:530)
  at org.datanucleus.store.mapped.mapping.SingleFieldMapping.prepareDatastoreMapping(SingleFieldMapping.java:57)
  at org.datanucleus.store.mapped.mapping.SingleFieldMapping.initialize(SingleFieldMapping.java:46)
  at org.datanucleus.store.mapped.mapping.MappingFactory.createMapping(MappingFactory.java:97)
  at org.datanucleus.store.mapped.mapping.AbstractMappingManager.getMapping(AbstractMappingManager.java:248)
  at org.datanucleus.store.rdbms.table.ClassTable.manageMembers(ClassTable.java:567)
  at org.datanucleus.store.rdbms.table.ClassTable.manageClass(ClassTable.java:447)
  at org.datanucleus.store.rdbms.table.ClassTable.initializeForClass(ClassTable.java:1086)
  at org.datanucleus.store.rdbms.table.ClassTable.initialize(ClassTable.java:264)
  at org.datanucleus.store.rdbms.RDBMSManager$ClassAdder.initializeClassTables(RDBMSManager.java:2642)
  at org.datanucleus.store.rdbms.RDBMSManager$ClassAdder.addClassTablesAndValidate(RDBMSManager.java:2549)
  at org.datanucleus.store.rdbms.RDBMSManager$ClassAdder.run(RDBMSManager.java:2200)
  at org.datanucleus.store.rdbms.AbstractSchemaTransaction.execute(AbstractSchemaTransaction.java:113)
  at org.datanucleus.store.rdbms.RDBMSManager.addClasses(RDBMSManager.java:992)
  at org.datanucleus.store.rdbms.RDBMSManager.addClasses(RDBMSManager.java:958)
  at org.datanucleus.store.AbstractStoreManager.addClass(AbstractStoreManager.java:725)
  at org.datanucleus.store.mapped.MappedStoreManager.getDatastoreClass(MappedStoreManager.java:358)
  at org.datanucleus.store.rdbms.RDBMSManager.getPropertiesForGenerator(RDBMSManager.java:1510)
  at org.datanucleus.store.AbstractStoreManager.getStrategyValue(AbstractStoreManager.java:1078)
  at org.datanucleus.ObjectManagerImpl.newObjectId(ObjectManagerImpl.java:2599)
  at org.datanucleus.state.JDOStateManagerImpl.setIdentity(JDOStateManagerImpl.java:873)
  at org.datanucleus.state.JDOStateManagerImpl.initialiseForPersistentNew(JDOStateManagerImpl.java:458)
  at org.datanucleus.state.StateManagerFactory.newStateManagerForPersistentNew(StateManagerFactory.java:151)
  at org.datanucleus.ObjectManagerImpl.persistObjectInternal(ObjectManagerImpl.java:1300)
  at org.datanucleus.ObjectManagerImpl.persistObject(ObjectManagerImpl.java:1178)
  at org.datanucleus.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:669)
  at org.datanucleus.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:694)
  at org.datanucleus.test.Main.main(Main.java:52)