websphere下部署的程序Caused by: java.lang.NullPointerException

保存时时好时坏 ,头疼死了.帮帮忙啊.日志如下:
Caused by: java.lang.NullPointerException
at oracle.jdbc.dbaccess.DBData.clearItem(DBData.java:431)
at oracle.jdbc.dbaccess.DBDataSetImpl.clearItem(DBDataSetImpl.java:3528)
at oracle.jdbc.driver.OraclePreparedStatement.clearParameters(OraclePreparedStatement.java:3401)
at com.ibm.ws.rsadapter.jdbc.WSJdbcConnection.resetStatement(WSJdbcConnection.java:3144)
at com.ibm.ws.rsadapter.jdbc.WSJdbcConnection.prepareStatement(WSJdbcConnection.java:2721)
at org.apache.openjpa.lib.jdbc.DelegatingConnection.prepareStatement(DelegatingConnection.java:166)
at org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator$LoggingConnection.prepareStatement(LoggingConnectionDecorator.java:225)
at org.apache.openjpa.lib.jdbc.DelegatingConnection.prepareStatement(DelegatingConnection.java:164)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager$RefCountConnection.prepareStatement(JDBCStoreManager.java:1449)
at org.apache.openjpa.lib.jdbc.DelegatingConnection.prepareStatement(DelegatingConnection.java:153)
at org.apache.openjpa.jdbc.kernel.PreparedStatementManagerImpl.prepareStatement(PreparedStatementManagerImpl.java:160)
at org.apache.openjpa.jdbc.kernel.BatchingPreparedStatementManagerImpl.flushBatch(BatchingPreparedStatementManagerImpl.java:152)
at org.apache.openjpa.jdbc.kernel.BatchingConstraintUpdateManager.flush(BatchingConstraintUpdateManager.java:63)
at com.ibm.ws.persistence.jdbc.kernel.ConstraintUpdateManager.flush(ConstraintUpdateManager.java:78)
at com.ibm.ws.persistence.jdbc.kernel.ConstraintUpdateManager.flush(ConstraintUpdateManager.java:60)
at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.flush(JDBCStoreManager.java:655)
at org.apache.openjpa.kernel.DelegatingStoreManager.flush(DelegatingStoreManager.java:130)
at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:2010)
at org.apache.openjpa.kernel.BrokerImpl.flushSafe(BrokerImpl.java:1908)