LinkedList NullPointerException occurs after switched from IBM JVM 1.4.0 to 1.4.1

Discussion in 'Java' started by Tohru Kao, Jul 7, 2003.

  1. Tohru Kao

    Tohru Kao Guest

    Hi,

    I encounter a NullPointerException after I switched from IBM JVM 1.4.0 to
    IBM JVM 1.4.1.

    The component I use is:

    Linux 7.3
    IBM JVM 1.4.1
    freemarker 1.5.2
    tomcat 4.1.18

    Please give any advice about this NullPointerException which I didn't
    encounter in IBM JVM 1.4.0.

    Here is the stack trace:

    java.lang.NullPointerException
    at java.util.LinkedList$ListItr.next(LinkedList.java:510)
    at freemarker.template.expression.ExpressionBuilder.associateOperators(ExpressionBuilder.java)
    at freemarker.template.expression.ExpressionBuilder.buildExpression(ExpressionBuilder.java)
    at freemarker.template.expression.ExpressionBuilder.build(ExpressionBuilder.java)
    at freemarker.template.compiler.StandardTemplateParser.parseExpression(StandardTemplateParser.java)
    at freemarker.template.compiler.StandardTemplateParser.parseVariable(StandardTemplateParser.java)
    at freemarker.template.compiler.StandardTemplateParser.parseVariableInstruction(StandardTemplateParser.java)
    at freemarker.template.compiler.StandardTemplateParser.getNextInstruction(StandardTemplateParser.java)
    at freemarker.template.compiler.LinkedListTemplateBuilder.buildLinks(LinkedListTemplateBuilder.java)
    at freemarker.template.compiler.LinkedListTemplateBuilder.buildGenericBody(LinkedListTemplateBuilder.java)
    at freemarker.template.compiler.LinkedListTemplateBuilder.buildStatement(LinkedListTemplateBuilder.java)
    at freemarker.template.instruction.GenericStartInstruction.callBuilder(GenericStartInstruction.java)
    at freemarker.template.compiler.LinkedListTemplateBuilder.buildLinks(LinkedListTemplateBuilder.java)
    at freemarker.template.compiler.LinkedListTemplateBuilder.buildStatement(LinkedListTemplateBuilder.java)
    at freemarker.template.instruction.IfInstruction.callBuilder(IfInstruction.java)
    at freemarker.template.compiler.LinkedListTemplateBuilder.buildLinks(LinkedListTemplateBuilder.java)
    at freemarker.template.compiler.LinkedListTemplateBuilder.build(LinkedListTemplateBuilder.java)
    at freemarker.template.Template.compileText(Template.java)
    at freemarker.template.Template.compileFromStream(Template.java)
    at freemarker.template.Template.compileFromStream(Template.java)
    at freemarker.template.Template.compileFromFile(Template.java)
    at freemarker.template.Template.(Template.java)
    at freemarker.template.FileTemplateCache.loadTemplate(FileTemplateCache.java)
    at freemarker.template.FileTemplateCache.getLatestTemplate(FileTemplateCache.java)
    at freemarker.template.FileTemplateCache.getTemplate(FileTemplateCache.java)
    at org.mytest.HtmlTemplateController.getTemplate(HtmlTemplateController.java:73)
    at org.mytest.HtmlTemplateController.getTemplate(HtmlTemplateController.java:99)
    at org.mytest.MyServlet.doGet(MyServlet.java:101)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
    at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
    at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
    at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
    at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
    at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:261)
    at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:360)
    at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:632)
    at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:590)
    at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:707)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:530)
    at java.lang.Thread.run(Thread.java:568)

    TIA,
    -Tohru
     
    Tohru Kao, Jul 7, 2003
    #1
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  2. Tohru Kao

    Chris Guest

    I suspect that there's a bug in your code that was being silently
    ignored in the earlier JVM, but is now being trapped, however the
    stack trace isn't much help without seeing some of the code.

    Post a fragment where the exception is being thrown from (i.e. where
    next() is called) and someone might be able to help.

    - sarge
     
    Chris, Jul 8, 2003
    #2
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