Re: JSTL JSP compile error

"Rahul Akolkar" <[email protected]> Mon, 20 Mar 2006 19:12:59 -0500
Newsgroups	gmane.comp.jakarta.taglibs.user
Message-ID	<[email protected]>
On 3/20/06, avilay parekh <[email protected]> wrote:
> 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
<snip/>

Are you sure these are JSTL 1.1 jars? tagPlugins.xml is not relevant.
JSP looks good.

Is it a 2.3 or 2.4 webapp? See also:
http://wiki.apache.org/jakarta-taglibs/FrequentlyAskedQuestions

-Rahul



>
> 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
>