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http://issues.apache.org/bugzilla/show_bug.cgi?id=43632 Summary: NullPointerException in x:transform Product: Taglibs Version: unspecified Platform: Sun OS/Version: SunOS Status: NEW Severity: normal Priority: P2 Component: Standard Taglib AssignedTo: taglibs-dev@jakarta.apache.org ReportedBy: [EMAIL PROTECTED] 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. The server information is: Tomcat 5.5.17 JVM: Sun 1.5.0_07-b03 OS: SunOS 5.9 Arch: sparc -- Configure bugmail: http://issues.apache.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
