NullPointerException in server pages generation (pb with bufferin g?)

[SOBKOWSKI Andrej]

Hello All,   I'm getting a strange NullPointerException (log reported below). I'm in a pretty standard configuration that works in other cases: -          XSP pages generating XML data via ESQL tags -          XSLT transformation generating Excel-Gnumeric-compatible XML to be passed on to the HSSF Serializer (POI -> Excel) -          HSSF Serializer   I initially thought there was something in data generated but I tried separating the steps and everything works fine: if I save the XML generated by my XSL transformation and I feed it directly to the HSSF serializer, everything is OK. So it must be something related to the "process" of generate-transform-serialize.   Could it be something related to buffering i.e. somehow the stream generated isn't flushed or generated soon enough for the next processor?   Any suggestions are appreciated. Thank you in advance.   Andrej   Environment: Windows XP, Welogic 7.0sp2, 512Mb or RAM allocated to the process   Exception log: java.lang.RuntimeException: java.lang.NullPointerException         at org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3418)         at org.apache.xalan.transformer.TransformerHandlerImpl.endDocument(TransformerHandlerImpl.java:389)         at org.apache.cocoon.xml.AbstractXMLPipe.endDocument(AbstractXMLPipe.java:55)         at org.apache.cocoon.transformation.TraxTransformer.endDocument(TraxTransformer.java:562)         at org.apache.cocoon.www.reports.master.master_xsp.generate(org.apache.cocoon.www.reports.master.master_xsp:1388)         at org.apache.cocoon.generation.ServerPagesGenerator.generate(ServerPagesGenerator.java:228)         at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLPipeline(AbstractProcessingPipeline.java:530)         at org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.processXMLPipeline(AbstractCachingProcessingPipeline.java:172)         at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process(AbstractProcessingPipeline.java:468)         at org.apache.cocoon.components.treeprocessor.sitemap.SerializeNode.invoke(SerializeNode.java:120)         at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:46)         at org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:130)         at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:68)         at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:138)         at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:68)         at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:89)         at org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:240)         at org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:180)         at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:243)         at org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:117)         at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:46)         at org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:130)         at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:68)         at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:138)         at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:68)         at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:89)         at org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:240)         at org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:180)         at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:243)         at org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:117)         at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:46)         at org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:130)         at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:68)         at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:138)         at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:68)         at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:89)         at org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:240)         at org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:180)         at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:243)         at org.apache.cocoon.Cocoon.process(Cocoon.java:606)         at org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:1119)         at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)         at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1058)         at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:401)         at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:306)         at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:5445)         at weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManager.java:780)         at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3105)         at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2588)         at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:213)         at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:189)   " 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