奇怪的BIRT Chart NullPointerException

使用的是birt2.5；birt designer中预览chart报表没问题；部署到tomcat中访问的时候报NullPointerException：

引用

java.lang.NullPointerException
at org.eclipse.birt.chart.reportitem.ChartReportItemImpl.doCompatibility(ChartReportItemImpl.java:302)
at org.eclipse.birt.chart.reportitem.ChartReportItemImpl.deserialize(ChartReportItemImpl.java:282)
at org.eclipse.birt.report.model.extension.PeerExtensibilityProvider.initializeReportItem(PeerExtensibilityProvider.java:582)
at org.eclipse.birt.report.model.elements.ExtendedItem.initializeReportItem(ExtendedItem.java:305)
at org.eclipse.birt.report.model.elements.ExtendedItem.doCheck(ExtendedItem.java:642)
at org.eclipse.birt.report.model.elements.ExtendedItem.checkCompatibility(ExtendedItem.java:604)
at org.eclipse.birt.report.model.parser.ModuleParserHandler.handleExtendedItemCompatibility(ModuleParserHandler.java:431)
at org.eclipse.birt.report.model.parser.ModuleParserHandler.endDocument(ModuleParserHandler.java:393)
at org.apache.xerces.parsers.AbstractSAXParser.endDocument(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl.endEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.endEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)
at org.apache.xerces.impl.XMLEntityScanner.skipSpaces(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl$TrailingMiscDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:395)
at org.eclipse.birt.report.model.parser.ModuleReader.readModule(ModuleReader.java:94)
at org.eclipse.birt.report.model.parser.DesignReader.read(DesignReader.java:88)
at org.eclipse.birt.report.model.core.DesignSessionImpl.openDesign(DesignSessionImpl.java:315)
at org.eclipse.birt.report.model.api.SessionHandleImpl.openDesign(SessionHandleImpl.java:294)
at org.eclipse.birt.report.engine.parser.ReportParser.getDesignHandle(ReportParser.java:158)
at org.eclipse.birt.report.engine.api.impl.ReportEngineHelper.openReportDesign(ReportEngineHelper.java:255)
at org.eclipse.birt.report.engine.api.impl.ReportEngine.openReportDesign(ReportEngine.java:589)
at org.eclipse.birt.report.service.ReportEngineService.openReportDesign(ReportEngineService.java:383)
at org.eclipse.birt.report.utility.BirtUtility.getRunnableFromDesignFile(BirtUtility.java:594)
at org.eclipse.birt.report.context.ViewerAttributeBean.getDesignHandle(ViewerAttributeBean.java:654)
at org.eclipse.birt.report.context.ViewerAttributeBean.__init(ViewerAttributeBean.java:231)
at org.eclipse.birt.report.context.BaseAttributeBean.init(BaseAttributeBean.java:233)
at org.eclipse.birt.report.context.ViewerAttributeBean.<init>(ViewerAttributeBean.java:116)
at org.eclipse.birt.report.context.BirtContext.__init(BirtContext.java:44)
at org.eclipse.birt.report.context.BaseContext.<init>(BaseContext.java:69)
at org.eclipse.birt.report.context.BirtContext.<init>(BirtContext.java:30)
at org.eclipse.birt.report.servlet.ViewerServlet.__getContext(ViewerServlet.java:150)
at org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.doPost(BirtSoapMessageDispatcherServlet.java:243)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.service(BirtSoapMessageDispatcherServlet.java:122)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.eclipse.birt.report.filter.ViewerFilter.doFilter(ViewerFilter.java:68)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)

找到原因：
Xerces & Xalan jars，如果缺这两个jar包中的任何一个，请加到lib下。
http://dev.eclipse.org/newslists/news.eclipse.birt/msg30622.html

引用

I got the problem fixed.

The problem is with the Oracle Application Server. OAS is shipped with Oracle XML Parser, which is the default XML parser/transformer implementation used for any application deployed into Oracle Application Server. Oracle's JAXP implementation doesn't seems to be complete and gave problem with the BIRT runtime.

I got this problem fixed by adding the Xerces & Xalan jars into the WEB-INF/lib folder of BIRT runtime war and adding the following entry to the orion-web.xml in the application-deployments folder.

<web-app-class-loader search-local-classes-first="true" include-war-manifest-class-path="true"/>

Now OAS loads the xerces & xalan implementation for BIRT Runtime and the chart appears fine.