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From "avilay parekh" <avi...@gmail.com>
Subject JSTL JSP compile error
Date Mon, 20 Mar 2006 05:35:47 GMT
Hi,

I have been trying to run JSPs with JSTL on tomcat 5.0.28 without any success.

My setup:

$CATALINA_ROOT/
webapps/
   tp/
       login.html
       two2.jsp
       WEB-INF/
           web.xml
           lib/
               jstl.jar
               standard.jar

Here is what two2.jsp looks like:
-------------
<%@page contentType="text/html"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head><title>Post Data Viewer</title></head>
<body>
<h2>Here is your posted data</h2>

<c:forEach var="map_entry" items="${param}">
   <strong><c:out value="${map_entry.key}" /></strong>:
   <c:out value="${map_entry.value}" /><br><br>
</c:forEach>

</body>
</html>
---------------------

Here is the error I get when tomcat access two2.jsp:
---------------------------------
org.apache.jasper.JasperException: Unable to compile class for JSP

Generated servlet error:
C:\Program Files\Java\jakarta-tomcat-5.0.28\work\Catalina\localhost\tp\org\apache\jsp\two2_jsp.java:97:
_jspx_meth_c_out_0(javax.servlet.jsp.tagext.JspTag,javax.servlet.jsp.PageContext,int[])
in org.apache.jsp.two2_jsp cannot be applied to
(org.apache.taglibs.standard.tag.rt.core.ForEachTag,javax.servlet.jsp.PageContext,int[])
         if (_jspx_meth_c_out_0(_jspx_th_c_forEach_0,
_jspx_page_context, _jspx_push_body_count_c_forEach_0))
             ^


Generated servlet error:
C:\Program Files\Java\jakarta-tomcat-5.0.28\work\Catalina\localhost\tp\org\apache\jsp\two2_jsp.java:101:
_jspx_meth_c_out_1(javax.servlet.jsp.tagext.JspTag,javax.servlet.jsp.PageContext,int[])
in org.apache.jsp.two2_jsp cannot be applied to
(org.apache.taglibs.standard.tag.rt.core.ForEachTag,javax.servlet.jsp.PageContext,int[])
         if (_jspx_meth_c_out_1(_jspx_th_c_forEach_0,
_jspx_page_context, _jspx_push_body_count_c_forEach_0))
             ^

2 errors
------------------------------------

I found a similar issue on this mailing list and the suggested fixes
were to copy tagPlugins.xml to WEB-INF and to make sure that jstl.jar
and standard.jar are not present in any other common or shared libs
apart from my webapp lib directory.

Tomcat was not loading jstl.jar and standard.jar from anywhere else,
there are only present in my WEB-INF/lib directory. When I copy
tagPlugins.xml to WEB-INF I get another error:

-------------------------
org.apache.jasper.JasperException
       org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
       org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
       org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
       javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.NullPointerException
       org.apache.jsp.two2_jsp._jspService(two2_jsp.java:191)
       org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
       javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
       org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
       org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
       org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
       javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
-------------------

Here is the java code where it chokes:

Object _jspx_temp0=
new String("${param}");
Iterator _jspx_temp1 = null;
if (_jspx_temp0 instanceof Object[])
_jspx_temp1=toIterator((Object[])_jspx_temp0);
else if (_jspx_temp0 instanceof boolean[])
_jspx_temp1=toIterator((boolean[])_jspx_temp0);
else if (_jspx_temp0 instanceof byte[])
_jspx_temp1=toIterator((byte[])_jspx_temp0);
else if (_jspx_temp0 instanceof char[])
_jspx_temp1=toIterator((char[])_jspx_temp0);
else if (_jspx_temp0 instanceof short[])
_jspx_temp1=toIterator((short[])_jspx_temp0);
else if (_jspx_temp0 instanceof int[])
_jspx_temp1=toIterator((int[])_jspx_temp0);
else if (_jspx_temp0 instanceof long[])
_jspx_temp1=toIterator((long[])_jspx_temp0);
else if (_jspx_temp0 instanceof float[])
_jspx_temp1=toIterator((float[])_jspx_temp0);
else if (_jspx_temp0 instanceof double[])
_jspx_temp1=toIterator((double[])_jspx_temp0);
else if (_jspx_temp0 instanceof Collection)
_jspx_temp1=((Collection)_jspx_temp0).iterator();
else if (_jspx_temp0 instanceof Iterator)
_jspx_temp1=(Iterator)_jspx_temp0;
else if (_jspx_temp0 instanceof Enumeration)
_jspx_temp1=toIterator((Enumeration)_jspx_temp0);
else if (_jspx_temp0 instanceof Map)
_jspx_temp1=((Map)_jspx_temp0).entrySet().iterator();

while (_jspx_temp1.hasNext()){
   _jspx_page_context.setAttribute(
   "map_entry", _jspx_temp1.next());
:::::::::::
}

--------------------
while statement gets a NullPointerException.

Any help is much appreciated.

Regards,
Avilay Parekh

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