version "1.6.0_20", Java(TM) SE Runtime Environment (build
1.6.0_20-b02), Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01, mixed
mode)
Tomcat: 6.0.26
I'm having trouble with a custom tag and I've tried to reduce the
problem to its most basic form:
/WEB-INF/tags/example.tag:
<%@tag %>
<%@attribute name="xName" required="true" rtexprvalue="true" %>
<h1>xName="${xName}"</h1>
/jsp/Example.jsp:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd";>
<%@page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" %>
<%@taglib prefix="ex" tagdir="/WEB-INF/tags" %>
<html>
<body>
<ex:example xName="Testing Example" />
</body>
</html>
I usually get:
You have run into a org.apache.jasper.JasperException:
/jsp/Example.jsp(6,4) Unable to find setter method for attribute: xName
error.
But sometimes I get this:
You have run into a java.lang.ClassNotFoundException:
org.apache.jsp.jsp.Example_jsp error.
Any idea what I'm doing wrong? From what I can see, my code seems to mirror
examples I've found in books and on the web. Intermittent results
suggest a race
condition to me though that seems odd here. I've not had good luck with
google on
this error.
Full stack traces for the exceptions here:
Feb 2, 2011 1:55:02 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: /jsp/Example.jsp(6,4) Unable to find
setter method for attribute: xName
at
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
at
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
at
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
at
org.apache.jasper.compiler.Generator$GenerateVisitor.evaluateAttribute(Generator.java:2809)
at
org.apache.jasper.compiler.Generator$GenerateVisitor.generateSetters(Generator.java:3032)
at
org.apache.jasper.compiler.Generator$GenerateVisitor.generateCustomDoTag(Generator.java:2452)
at
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1736)
at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1530)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
at
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2411)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2417)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:495)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
at
org.apache.jasper.compiler.Generator.generate(Generator.java:3440)
at
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:231)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:347)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
at
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:555)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
at
org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)
at
org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:774)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:703)
at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:896)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
at java.lang.Thread.run(Thread.java:619)
Feb 2, 2011 1:55:29 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.ClassNotFoundException: org.apache.jsp.jsp.Example_jsp
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:134)
at
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
at
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:628)
at
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:144)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:555)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
at
org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)
at
org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:774)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:703)
at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:896)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
at java.lang.Thread.run(Thread.java:619)
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