| ClassCastException for JSP expression language [message #754268] |
Tue, 01 November 2011 17:09  |
 warhen 
Messages: 4
Registered: November 2011 |
Junior Member |
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Hi, I am running the following version of eclipse:
Eclipse Java EE IDE for Web Developers.
Version: Indigo Service Release 1
Build id: 20110916-0149
I am seeing an issue that should be easy to reproduce because it happens after creating a new "Dynamic Web Project" without adding on any project natures or additional libraries.
All you need is to have the following two versions of tomcat installed:
- tomcat version 6 (I have 6.0.20)
- tomcat version 7 (I have 7.0.22)
Once the project is created, I put an index.jsp file in the "WebContent" directory.
The content of index.jsp is:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
${header["user-agent"]}
1) Run As --> Run on Server --> Tomcat v6.0 at localhost
Everything works (I get a webpage that shows what browser is being used).
2) Run As --> Run on Server --> Tomcat v7.0 at localhost
I get the following exception:
org.apache.jasper.JasperException: java.lang.ClassCastException: org.apache.jasper.runtime.ELContextImpl cannot be cast to org.apache.jasper.el.ELContextImpl
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:548)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:471)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause
java.lang.ClassCastException: org.apache.jasper.runtime.ELContextImpl cannot be cast to org.apache.jasper.el.ELContextImpl
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:982)
org.apache.jsp.index_jsp._jspService(index_jsp.java:64)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
I can find "org.apache.jasper.el.ELContextImpl" in the jasper.jar in the tomcat lib folder. However, I don't know where "org.apache.jasper.runtime.ELContextImpl" originates.
I have surfed the web a bit to find clues and the most I've been able to find is the notion that this sort of thing could be due to two separate class loaders clashing.
I can only guess at this point. All I know is that the simplest jsp page will work until you put any jsp expression in it, like ${myVar}.
It would be a relief if anyone has seen this or suspects where I messed up.
Thanks,
Warhen
[Updated on: Tue, 01 November 2011 17:10] Report message to a moderator |
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| Re: ClassCastException for JSP expression language [message #754409 is a reply to message #754268] |
Wed, 02 November 2011 13:12  |
Larry Isaacs
Messages: 1354
Registered: July 2009 |
Senior Member |
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It doesn't appear that org.apache.jasper.runtime.ELContextImpl would be
a normal part of Tomcat 6.0.x or 7.0.x. My only guesses as to where it
might be coming from is that you are using a packaged version of Tomcat
on Linux, instead of a binary archive from the Tomcat site. (Packagers
have been known to create Tomcat installs where not everything works.)
And second, it's sneaking into your project's "WEB-INF/lib" via some
jar. Check the "WEB-INF/lib" of your webapp under
"<workspace>/.metadata/.plugins/org.eclipse.wst.server.core/tmp?/wtpwebapps"
(assuming a default WTP server configuration) and see if a jar there
contains this class. Such a jar shouldn't be there.
Cheers,
Larry
On 11/1/2011 1:09 PM, warhen wrote:
> Hi, I am running the following version of eclipse:
>
> Eclipse Java EE IDE for Web Developers.
> Version: Indigo Service Release 1
> Build id: 20110916-0149
>
> I am seeing an issue that should be easy to reproduce because it happens
> after creating a new "Dynamic Web Project" without adding on any project
> natures or additional libraries.
> All you need is to have the following two versions of tomcat installed:
> - tomcat version 6 (I have 6.0.20)
> - tomcat version 7 (I have 7.0.22)
>
> Once the project is created, I put an index.jsp file in the "WebContent"
> directory.
> The content of index.jsp is:
>
> <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
> pageEncoding="ISO-8859-1"%>
>
> ${header["user-agent"]}
>
> 1) Run As --> Run on Server --> Tomcat v6.0 at localhost
> Everything works (I get a webpage that shows what browser is being used).
>
> 2) Run As --> Run on Server --> Tomcat v7.0 at localhost
> I get the following exception:
>
> org.apache.jasper.JasperException: java.lang.ClassCastException:
> org.apache.jasper.runtime.ELContextImpl cannot be cast to
> org.apache.jasper.el.ELContextImpl
> org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:548)
>
> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:471)
>
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
> org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
> javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
>
> root cause
>
> java.lang.ClassCastException: org.apache.jasper.runtime.ELContextImpl
> cannot be cast to org.apache.jasper.el.ELContextImpl
> org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:982)
>
> org.apache.jsp.index_jsp._jspService(index_jsp.java:64)
> org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
> javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
>
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
> org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
> javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
>
> I can find "org.apache.jasper.el.ELContextImpl" in the jasper.jar in the
> tomcat lib folder. However, I don't know where
> "org.apache.jasper.runtime.ELContextImpl" originates.
> I have surfed the web a bit to find clues and the most I've been able to
> find is the notion that this sort of thing could be due to two separate
> class loaders clashing.
>
> I can only guess at this point. All I know is that the simplest jsp page
> will work until you put any jsp expression in it, like ${myVar}.
>
> It would be a relief if anyone has seen this or suspects where I messed up.
>
> Thanks,
> Warhen
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| Re: ClassCastException for JSP expression language [message #754482 is a reply to message #754409] |
Wed, 02 November 2011 17:19 |
warhen
Messages: 4
Registered: November 2011 |
Junior Member |
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Thanks for the reply Larry.
I am not using a packaged version of Tomcat.
Both v6 and v7 installs were obtained from tomcat.apache.org and installed before I installed eclipse. When I installed eclipse, I added them as servers.
I looked in the "<workspace>/.metadata/.plugins/org.eclipse.wst.server.core/tmp?/wtpwebapps" directories as you suggested and found that there were no jars and not even a lib folder.
This is because the project I created had a single jsp file as its only feature. I added no libraries and it seems that no unknown functionality tried to add any either.
I decided to clean all projects and clean all of tomcat 7 and republish everything from scratch.
When I did this my project started working.
It's somewhat of a mystery as to why this worked because a thorough search did not turn up anything that cleaning would have solved by deletion.
Thanks for your help and if I figure out the cause of what happened, I will post it.
[Updated on: Wed, 02 November 2011 17:20] Report message to a moderator |
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