problem with forProperty custom tag

[John Cartwright <jc...@ngdc.noaa.gov>]

Hello All,

I'm trying to get the examples from the Fields&Kolb book running
and the
forProperty tag seems to be the only custom tag that won't work
(stack
trace listed below).  I'm using tomcat 3.2.1, a copy of wdjsp.zip
downloaded yesterday, and jdk1.3 on linux.

Experimentation shows that both the PlotBean and DataBean are being
properly constructed in forTag.jsp.

I've searched through this forum and found mentions of other types
of
error with this example, but they didn't seem to match these
symptoms. 
I'm thinking
that
the deployment must be OK since the other custom tags in this
taglib
work fine.

Any help would be much appreciated.

Thanks!

-- john



=============================================================================
Error: 500

Location: /webdev/advtags/forTag.jsp

Internal Servlet Error:

org.apache.jasper.JasperException: Unable to compile class for JSP
        at
org.apache.jasper.servlet.JspServlet.doLoadJSP(JspServlet.java:476)
        at
org.apache.jasper.servlet.JasperLoader12.loadJSP(JasperLoader12.java:146)
        at
org.apache.jasper.servlet.JspServlet.loadJSP(JspServlet.java:433)
        at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:152)
        at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:164)
        at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
        at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
        at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
        at org.apache.tomcat.core.Handler.service(Handler.java:286)
        at
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
        at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
        at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
        at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
        at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
        at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
        at java.lang.Thread.run(Thread.java:484)

Root cause: 

java.lang.NullPointerException
        at
org.apache.jasper.compiler.TagBeginGenerator.generateSetters(TagBeginGenerator.java:196)
        at
org.apache.jasper.compiler.TagBeginGenerator.generateServiceMethodStatements(TagBeginGenerator.java:291)
        at
org.apache.jasper.compiler.TagBeginGenerator.generate(TagBeginGenerator.java:360)
        at
org.apache.jasper.compiler.JspParseEventListener$GeneratorWrapper.generate(JspParseEventListener.java:773)
        at
org.apache.jasper.compiler.JspParseEventListener.generateAll(JspParseEventListener.java:220)
        at
org.apache.jasper.compiler.JspParseEventListener.endPageProcessing(JspParseEventListener.java:175)
        at
org.apache.jasper.compiler.Compiler.compile(Compiler.java:183)
        at
org.apache.jasper.servlet.JspServlet.doLoadJSP(JspServlet.java:462)
        at
org.apache.jasper.servlet.JasperLoader12.loadJSP(JasperLoader12.java:146)
        at
org.apache.jasper.servlet.JspServlet.loadJSP(JspServlet.java:433)
        at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:152)
        at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:164)
        at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
        at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
        at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
        at org.apache.tomcat.core.Handler.service(Handler.java:286)
        at
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
        at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
        at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
        at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
        at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
        at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
        at java.lang.Thread.run(Thread.java:484)
===============================================================================
John Cartwright
Professional Research Assistant / Associate Scientist
CIRES, SEG/NGDC/NOAA
(303) 497-6284
jcartwright@ngdc.noaa.gov
===============================================================================