我们有一个Tomcat Webapp，其中包含BIRT报告。暂时，我不知道我们使用的是哪个版本的BIRT，但是问题是在IBM Midrange上运行在64位Java 8上的Tomcat 7.0.93中的单个安装（许多安装）中发生的框。
在此安装中，如果禁用了BIRT查看器工具栏，则报告运行良好。
但是如果启用了该工具栏，那么我们将得到一个空指针异常，并产生以下堆栈跟踪：
java.lang.NullPointerException
at org.eclipse.birt.report.engine.api.impl.RenderTask.initRenderTask(RenderTask.java:153)
at org.eclipse.birt.report.engine.api.impl.RenderTask.(RenderTask.java:115)
at org.eclipse.birt.report.engine.api.impl.RenderTask.(RenderTask.java:98)
at org.eclipse.birt.report.engine.api.impl.ReportEngineHelper.createRenderTask(ReportEngineHelper.java:502)
at org.eclipse.birt.report.engine.api.impl.ReportEngine.createRenderTask(ReportEngine.java:515)
at org.eclipse.birt.report.service.ReportEngineService.createRenderTask(ReportEngineService.java:1635)
at org.eclipse.birt.report.service.ReportEngineService.renderReport(ReportEngineService.java:1537)
at org.eclipse.birt.report.service.BirtViewerReportService.getPage(BirtViewerReportService.java:204)
at org.eclipse.birt.report.service.actionhandler.AbstractGetPageActionHandler.doExecution(AbstractGetPageActionHandler.java:237)
at org.eclipse.birt.report.service.actionhandler.AbstractGetPageActionHandler.__execute(AbstractGetPageActionHandler.java:104)
at org.eclipse.birt.report.service.actionhandler.AbstractBaseActionHandler.execute(AbstractBaseActionHandler.java:90)
at org.eclipse.birt.report.soapengine.processor.AbstractBaseDocumentProcessor.__executeAction(AbstractBaseDocumentProcessor.java:47)
at org.eclipse.birt.report.soapengine.processor.AbstractBaseComponentProcessor.executeAction(AbstractBaseComponentProcessor.java:143)
at org.eclipse.birt.report.soapengine.processor.BirtDocumentProcessor.handleGetPage(BirtDocumentProcessor.java:87)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:90)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:508)
at org.eclipse.birt.report.soapengine.processor.AbstractBaseComponentProcessor.process(AbstractBaseComponentProcessor.java:112)
at org.eclipse.birt.report.soapengine.endpoint.BirtSoapBindingImpl.getUpdatedObjects(BirtSoapBindingImpl.java:66)
at sun.reflect.GeneratedMethodAccessor71.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:508)
at org.apache.axis.providers.java.RPCProvider.invokeMethod(RPCProvider.java:397)
at org.apache.axis.providers.java.RPCProvider.processMessage(RPCProvider.java:186)
at org.apache.axis.providers.java.JavaProvider.invoke(JavaProvider.java:323)
at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)
at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)
at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)
at org.apache.axis.handlers.soap.SOAPService.invoke(SOAPService.java:454)
at org.apache.axis.server.AxisServer.invoke(AxisServer.java:281)
at org.apache.axis.transport.http.AxisServlet.doPost(AxisServlet.java:699)
at org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.doPost(BirtSoapMessageDispatcherServlet.java:250)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.service(BirtSoapMessageDispatcherServlet.java:136)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.eclipse.birt.report.filter.ViewerFilter.doFilter(ViewerFilter.java:68)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at com.touchtone.wintouch.WintouchFilter.doFilter(WintouchFilter.java:126)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at com.touchtone.wintouch.security.ContentSecurityPolicyFilter.doFilter(ContentSecurityPolicyFilter.java:186)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1137)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:319)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1160)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:811)
在我们的其他任何安装上都没有发生，这使我们的webapp团队陷入了困境。
[其他可能相关的信息：1.这似乎未在任何Tomcat日志中放入anything。2. Tomcat管理器或在Tomcat服务器作业上执行WRKJVMJOB都不会显示任何迹象表明该作业正在堆空间不足。
拦截请求并进行比较，以查找标题，URL参数等之间是否存在差异。 Fiddler（或其他一些拦截代理，TLS调试日志等）。
Java 14引入了一个不错的选项，使NullPointerException更加详细，但是您需要在启动时使用-XX:+ShowCodeDetailsInExceptionMessages启用它。
如果其他所有方法均失败，请在启用远程调试套接字的情况下运行Tomcat，并使用例如Eclipse可以在您要检查的任何方法或异常上设置断点。
祝你好运！