Hi Rob,
Could you open that as a Bugzilla entry? Just to make sure it doesn't
get forgotten if there's no immediate reply here.
Hen
On 10/15/07, Rob Adamson <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I may have discovered a bug in jakarta-taglibs-standard-1.1.2.
>
> The JSP code
>
> <x:transform doc="${onlineevents_archiveDoc}"
> xslt="${onlineevents_archiveXSLT}">
> <x:param name="order" value="${order}" />
> </x:transform>
>
> is very occasionally causing a NullPointerException, with the
> following stack trace:
>
> java.lang.NullPointerException
> ***
> org.apache.taglibs.standard.tag.common.xml.TransformSupport.addParameter(TransformSupport.java:221)
> ***
> org.apache.taglibs.standard.tag.common.xml.ParamSupport.doEndTag(ParamSupport.java:74)
> ***
> org.apache.jsp.onlineevents.archive.default_jsp._jspx_meth_x_param_0(default_jsp.java:546)
> ***
> org.apache.jsp.onlineevents.archive.default_jsp._jspx_meth_x_transform_0(default_jsp.java:515)
> ***
> org.apache.jsp.onlineevents.archive.default_jsp._jspService(default_jsp.java:206)
> *** org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
> *** javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
> ***
> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
> *** org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
> *** org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
> *** javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
> ***
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
> ***
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
> ***
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
> ***
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
> ***
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
> ***
> org.apache.catalina.cluster.tcp.ReplicationValve.invoke(ReplicationValve.java:346)
> ***
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
> ***
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
> ***
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
> *** org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:425)
> ***
> org.apache.coyote.ajp.AjpAprProtocol$AjpConnectionHandler.process(AjpAprProtocol.java:452)
> *** org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1285)
> *** java.lang.Thread.run(Thread.java:595)
>
> Looking at the source of TransformSupport, I see the offending method is:
>
> public void addParameter(String name, Object value) {
> t.setParameter(name, value);
> }
>
> implying that instance variable 't' (of type
> javax.xml.transform.Transformer) is set to null - which suggests some
> kind of weird bug where it is either overwritten or not initialised
> properly.
>
> I'm a bit stuck as I can't reproduce this myself; it seems to be
> occurring at random several times a day on my production site.
>
> I had thought it was a concurrency issue and have tried wrapping the
> call to <x:transform> in a synchronized block, just in case, but it
> hasn't made any noticeable difference.
>
> I don't know enough about the taglib lifecycle and tag pooling to
> tackle this myself, so any help or insights would be appreciated!
>
> The server information is:
> Tomcat 5.5.17
> JVM: Sun 1.5.0_07-b03
> OS: SunOS 5.9
> Arch: sparc
>
> Cheers,
> Rob
>
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