奇怪的BIRT数据集问题

遇到了一个奇怪的问题，我在BIRT下建立了数据集，查询语句如下：

select  

B.A_C_USER_ID,
B.A_C_UNIT_CODE,
B.A_C_PRODUCT_ID,
B.A_C_PRODUCT_NAME,
B.A_C_FUNC_ID,
EXIMUSER.SEC_USER_AUTH_LEVEL.I_AUTH_LEVEL
from

(select  
EXIMUSER.SEC_USER_INFO.C_USER_ID   A_C_USER_ID,
EXIMUSER.SEC_USER_INFO.C_UNIT_CODE   A_C_UNIT_CODE,
EXIMUSER.SEC_OP_FUNC.C_PRODUCT_ID   A_C_PRODUCT_ID,
EXIMUSER.SEC_OP_FUNC.C_PRODUCT_NAME   A_C_PRODUCT_NAME,
EXIMUSER.SEC_OP_FUNC.C_FUNC_ID   A_C_FUNC_ID
from   EXIMUSER.SEC_USER_INFO  
left   join  
EXIMUSER.SEC_OP_FUNC   on   EXIMUSER.SEC_OP_FUNC.C_USER_ID=EXIMUSER.SEC_USER_INFO.C_USER_ID
where   EXIMUSER.SEC_USER_INFO.C_UNIT_CODE=?)   B  

left   join

EXIMUSER.SEC_USER_AUTH_LEVEL   on   EXIMUSER.SEC_USER_AUTH_LEVEL.C_USER_ID=B.A_C_USER_ID  
and   EXIMUSER.SEC_USER_AUTH_LEVEL.C_PRODUCT_ID=B.A_C_PRODUCT_ID


在BIRT   的IDE里面预览没有任何问题，但我将模板放到J2EE应用中，结果却报错。报错信息如下：
[08-2-29   9:43:00:265   CST]   3cf03cf0   SystemErr           R   java.lang.NullPointerException
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   java.lang.Throwable. <init> (Throwable.java)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   java.lang.Throwable. <init> (Throwable.java)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   java.lang.NullPointerException. <init> (NullPointerException.java:60)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   com.ibm.ws.rsadapter.jdbc.WSJdbcResultSetMetaData.getColumnCount(WSJdbcResultSetMetaData.java:118)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.report.data.oda.jdbc.Statement.getMetaData(Statement.java:278)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.datatools.connectivity.oda.consumer.helper.OdaQuery.doGetMetaData(OdaQuery.java:388)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.datatools.connectivity.oda.consumer.helper.OdaQuery.getMetaData(OdaQuery.java:356)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.data.engine.odaconsumer.PreparedStatement.getRuntimeMetaData(PreparedStatement.java:369)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.data.engine.odaconsumer.PreparedStatement.getProjectedColumns(PreparedStatement.java:339)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.data.engine.odaconsumer.PreparedStatement.setColumnsProjection(PreparedStatement.java:1028)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.data.engine.executor.DataSourceQuery.prepare(DataSourceQuery.java:262)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.data.engine.impl.PreparedOdaDSQuery$OdaDSQueryExecutor.prepareOdiQuery(PreparedOdaDSQuery.java:344)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.data.engine.impl.QueryExecutor.prepareExecution(QueryExecutor.java:213)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.data.engine.impl.PreparedQuery.doPrepare(PreparedQuery.java:396)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.data.engine.impl.PreparedDataSourceQuery.execute(PreparedDataSourceQuery.java:145)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.data.engine.impl.PreparedOdaDSQuery.execute(PreparedOdaDSQuery.java:134)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.data.engine.impl.PreparedDataSourceQuery.execute(PreparedDataSourceQuery.java:125)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.report.engine.data.dte.DteDataEngine.doExecuteQuery(DteDataEngine.java:119)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.report.engine.data.dte.AbstractDataEngine.execute(AbstractDataEngine.java:210)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.report.engine.executor.ExecutionContext.executeQuery(ExecutionContext.java:1641)
[08-2-29   9:43:00:296   CST]   3cf03cf0   SystemErr           R   at   org.eclipse.birt.report.engine.executor.QueryItemExecutor.executeQue