java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.hsqldb.map.BaseHashMap.addOrRemove(BaseHashMap.java:334)
at org.hsqldb.lib.HashMap.put(HashMap.java:70)
at org.hsqldb.jdbc.pool.JDBCXADataSource.addResource(JDBCXADataSource.java:157)
at org.hsqldb.jdbc.pool.JDBCXAResource.start(JDBCXAResource.java:464)

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