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我試圖升級我的應用程序以使用BIRT 3.7.1版本。目前我使用的是2.6.0版本。使用引擎API使用RunningCount聚合時出現NullPointerException
我正在使用最新的穩定版本3.7.1。
在我的測試過程中，我遇到了一個使用序列號（RunningCount Aggregation）的報告的異常。當我使用報表引擎API使用報表時，如果使用Web查看器，報表工作正常，則會發生此異常。
我附加了一個小測試用例來重新創建問題。這包括報告設計文件和我在那裏使用ReportEngine生成報告的類。
請看以下錯誤日誌：
Jan 3, 2012 4:34:42 PM org.eclipse.birt.report.engine.api.impl.RunAndRenderTask doRun
SEVERE: An error happened while running the report. Cause:
java.lang.NullPointerException
at org.eclipse.birt.core.util.IOUtil.writeInt(IOUtil.java:226)
at org.eclipse.birt.core.util.IOUtil.writeObject(IOUtil.java:674)
at org.eclipse.birt.data.engine.executor.transform.SimpleGroupCalculator.next(SimpleGroupCalculator.java:233)
at org.eclipse.birt.data.engine.executor.transform.SimpleResultSet.next(SimpleResultSet.java:562)
at org.eclipse.birt.data.engine.executor.transform.ResultSetWrapper.next(ResultSetWrapper.java:81)
at org.eclipse.birt.data.engine.impl.ResultIterator.hasNextRow(ResultIterator.java:584)
at org.eclipse.birt.data.engine.impl.ResultIterator.nextRow(ResultIterator.java:525)
at org.eclipse.birt.data.engine.impl.ResultIterator.next(ResultIterator.java:475)
at org.eclipse.birt.report.engine.data.dte.QueryResultSet.next(QueryResultSet.java:191)
at org.eclipse.birt.report.engine.executor.ListingElementExecutor.hasNextChild(ListingElementExecutor.java:244)
at org.eclipse.birt.report.engine.internal.executor.wrap.WrappedReportItemExecutor.hasNextChild(WrappedReportItemExecutor.java:86)
at org.eclipse.birt.report.engine.internal.executor.wrap.WrappedReportItemExecutor.hasNextChild(WrappedReportItemExecutor.java:86)
at org.eclipse.birt.report.engine.layout.html.HTMLBlockStackingLM.layoutNodes(HTMLBlockStackingLM.java:62)
at org.eclipse.birt.report.engine.layout.html.HTMLStackingLM.layoutChildren(HTMLStackingLM.java:26)
at org.eclipse.birt.report.engine.layout.html.HTMLTableLM.layoutChildren(HTMLTableLM.java:132)
at org.eclipse.birt.report.engine.layout.html.HTMLAbstractLM.layout(HTMLAbstractLM.java:140)
at org.eclipse.birt.report.engine.layout.html.HTMLBlockStackingLM.layoutNodes(HTMLBlockStackingLM.java:70)
at org.eclipse.birt.report.engine.layout.html.HTMLPageLM.layout(HTMLPageLM.java:92)
at org.eclipse.birt.report.engine.layout.html.HTMLReportLayoutEngine.layout(HTMLReportLayoutEngine.java:100)
at org.eclipse.birt.report.engine.api.impl.RunAndRenderTask.doRun(RunAndRenderTask.java:180)
at org.eclipse.birt.report.engine.api.impl.RunAndRenderTask.run(RunAndRenderTask.java:77)
at com.eclipse.birt.test.RunningCountFieldTest.main(RunningCountFieldTest.java:52)
Exception in thread "main" org.eclipse.birt.report.engine.api.EngineException: Error happened while running the report.
at org.eclipse.birt.report.engine.api.impl.RunAndRenderTask.doRun(RunAndRenderTask.java:196)
at org.eclipse.birt.report.engine.api.impl.RunAndRenderTask.run(RunAndRenderTask.java:77)
at com.eclipse.birt.test.RunningCountFieldTest.main(RunningCountFieldTest.java:52)
Caused by: java.lang.NullPointerException
at org.eclipse.birt.core.util.IOUtil.writeInt(IOUtil.java:226)
at org.eclipse.birt.core.util.IOUtil.writeObject(IOUtil.java:674)
at org.eclipse.birt.data.engine.executor.transform.SimpleGroupCalculator.next(SimpleGroupCalculator.java:233)
at org.eclipse.birt.data.engine.executor.transform.SimpleResultSet.next(SimpleResultSet.java:562)
at org.eclipse.birt.data.engine.executor.transform.ResultSetWrapper.next(ResultSetWrapper.java:81)
at org.eclipse.birt.data.engine.impl.ResultIterator.hasNextRow(ResultIterator.java:584)
at org.eclipse.birt.data.engine.impl.ResultIterator.nextRow(ResultIterator.java:525)
at org.eclipse.birt.data.engine.impl.ResultIterator.next(ResultIterator.java:475)
at org.eclipse.birt.report.engine.data.dte.QueryResultSet.next(QueryResultSet.java:191)
at org.eclipse.birt.report.engine.executor.ListingElementExecutor.hasNextChild(ListingElementExecutor.java:244)
at org.eclipse.birt.report.engine.internal.executor.wrap.WrappedReportItemExecutor.hasNextChild(WrappedReportItemExecutor.java:86)
at org.eclipse.birt.report.engine.internal.executor.wrap.WrappedReportItemExecutor.hasNextChild(WrappedReportItemExecutor.java:86)
at org.eclipse.birt.report.engine.layout.html.HTMLBlockStackingLM.layoutNodes(HTMLBlockStackingLM.java:62)
at org.eclipse.birt.report.engine.layout.html.HTMLStackingLM.layoutChildren(HTMLStackingLM.java:26)
at org.eclipse.birt.report.engine.layout.html.HTMLTableLM.layoutChildren(HTMLTableLM.java:132)
at org.eclipse.birt.report.engine.layout.html.HTMLAbstractLM.layout(HTMLAbstractLM.java:140)
at org.eclipse.birt.report.engine.layout.html.HTMLBlockStackingLM.layoutNodes(HTMLBlockStackingLM.java:70)
at org.eclipse.birt.report.engine.layout.html.HTMLPageLM.layout(HTMLPageLM.java:92)
at org.eclipse.birt.report.engine.layout.html.HTMLReportLayoutEngine.layout(HTMLReportLayoutEngine.java:100)
at org.eclipse.birt.report.engine.api.impl.RunAndRenderTask.doRun(RunAndRenderTask.java:180)
... 2 more
你可以找到一個示例程序來重現問題GitHub。
請幫我解決這個問題。