Are people actively doing things with the JSTL / Struts combination?
The first JSTL tag I attempted to use was the <c:set>. I attempted to
use it with a <nested:write> body but when I ran the page I got a null
pointer exception. The only workaround I could find was to re-write the
c:set as a very simple tag.
As you can see from the attached I have also modified some of the struts
tags so I assumed someone would assume I botched them. In this trace I
have modified NestedWriteTag (the only change was to make it a subclass
of my WriteTag, which I have heavily modified) but that has not been
executed.
Thanks for your help.
Regards
Edgar
Diff for my NestedWriteTag
60c60
< package tags;
---
> package org.apache.struts.taglib.nested.bean;
63d62
< import org.apache.struts.taglib.nested.bean.*;
66c65
<
---
> import org.apache.struts.taglib.bean.WriteTag;
A sample piece of code which fails.
<html:form action='myaction' method='post'>
<nested:iterate property='myarraylist'>
<c:set var="myChoiceValue" scope='request'>
<nested:write property='myNestedChoiceValue'>
</c:set>
<c:set var="myChoiceLabel" scope='request'>
<nested:write property='myNestedChoiceLabel'>
</c:set>
<nested:select property='myChoice'>
<html:options
name='<%=(String)
request.getAttribute(myChoiceValue)%>'
labelName='<%=(String)
request.getAttribute(myChoiceValue)%>'
/>
</nested:select>
</nested:iterate>
</html:form>
Stack trace - from the browser since this was a jsp runtime error
500 Servlet Exception
java.lang.NullPointerException
at
org.apache.struts.taglib.nested.NestedPropertyHelper.getNestedProperty(N
estedPropertyHelper.java:174)
at
org.apache.struts.taglib.nested.NestedPropertyHelper.getNestedProperty(N
estedPropertyHelper.java:195)
at
org.apache.struts.taglib.nested.NestedPropertyHelper.setNestedProperties
(NestedPropertyHelper.java:242)
at tags.NestedWriteTag.doStartTag(NestedWriteTag.java:90)
at
_web_22dinf._jsp._reportfilters__jsp._jspService(/WEB-INF/jsp/reportFilt
ers.jsp:193)
at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
at com.caucho.jsp.Page.subservice(Page.java:485)
at
com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182
)
at
com.caucho.server.http.Invocation.service(Invocation.java:311)
at
com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
at
com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.jav
a:213)
at
com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.jav
a:100)
at
com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.jav
a:77)
at
org.apache.struts.action.ActionServlet.processActionForward(ActionServle
t.java:1759)
at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1596)
at
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:510)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:165)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:103)
at
com.caucho.server.http.FilterChainServlet.doFilter(FilterChainServlet.ja
va:96)
at filters.programSecurity.doFilter(programSecurity.java:84)
at
com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java
:88)
at filters.checkLogon.doFilter(checkLogon.java:81)
at
com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java
:88)
at
com.caucho.server.http.Invocation.service(Invocation.java:311)
at
com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
at
com.caucho.server.http.RunnerRequest.handleRequest(RunnerRequest.java:34
2)
at
com.caucho.server.http.RunnerRequest.handleConnection(RunnerRequest.java
:272)
at com.caucho.server.TcpConnection.run(TcpConnection.java:137)
at java.lang.Thread.run(Thread.java:484)
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