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From Janne Jalkanen <Janne.Jalka...@ecyrd.com>
Subject Re: jsp's cannot find class from JSPWiki.jar
Date Wed, 26 Nov 2008 20:01:49 GMT

Check that you don't accidentally have an older JAR file anywhere in  
your classpath; that's what usually gets me :-)

BTW, would it be better to name the class as "Logger" just so that we  
don't have to do any changes except an import change?

/Janne

On Nov 26, 2008, at 20:41 , Harry Metske wrote:

> Hi devs,
>
> this must be a stupid error, but I don't see it.
> I'm working on https://issues.apache.org/jira/browse/JSPWIKI-376  
> (move from
> log4j to slf4j), and created a few classes in package  
> org.apache.jspwiki.log
> Starting up JSPWiki shows that the LoggerFactory in this package is  
> invoked
> about 75 times by JSPWiki classes requesting loggers.
> However, when I call the first jsp (Wiki.jsp), which has
> org.apache.jspwiki.log.LoggerFactory imported, I get this
> NoClassDefFoundError.
> Strange, the JSP does compile ! (?)
> Same results with other JSP's.
> The class resides in JSPWiki.jar.
> Why can the other jspwiki classes find this LoggerFactory, but  
> JSP's can't ?
> HTTP Status 500 -
> ------------------------------
>
> *type* Exception report
>
> *message*
>
> *description* *The server encountered an internal error () that  
> prevented it
> from fulfilling this request.*
>
> *exception*
>
> javax.servlet.ServletException: java.lang.NoClassDefFoundError:
> org/apache/jspwiki/log/LoggerFactory
> 	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:274)
> 	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
> 	com.ecyrd.jspwiki.ui.WikiServletFilter.doFilter 
> (WikiServletFilter.java:175)
> 	com.ecyrd.jspwiki.ui.WikiJSPFilter.doFilter(WikiJSPFilter.java:111)
>
> *root cause*
>
> java.lang.NoClassDefFoundError: org/apache/jspwiki/log/LoggerFactory
> 	org.apache.jsp.Wiki_jsp.<init>(Wiki_jsp.java:15)
> 	sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> 	sun.reflect.NativeConstructorAccessorImpl.newInstance 
> (NativeConstructorAccessorImpl.java:57)
> 	sun.reflect.DelegatingConstructorAccessorImpl.newInstance 
> (DelegatingConstructorAccessorImpl.java:45)
> 	java.lang.reflect.Constructor.newInstance(Constructor.java:532)
> 	java.lang.Class.newInstance0(Class.java:372)
> 	java.lang.Class.newInstance(Class.java:325)
> 	org.apache.jasper.servlet.JspServletWrapper.getServlet 
> (JspServletWrapper.java:145)
> 	org.apache.jasper.servlet.JspServletWrapper.service 
> (JspServletWrapper.java:329)
> 	org.apache.jasper.servlet.JspServlet.serviceJspFile 
> (JspServlet.java:337)
> 	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
> 	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
> 	com.ecyrd.jspwiki.ui.WikiServletFilter.doFilter 
> (WikiServletFilter.java:175)
> 	com.ecyrd.jspwiki.ui.WikiJSPFilter.doFilter(WikiJSPFilter.java:111)
>
> *root cause*
>
> java.lang.ClassNotFoundException: org.apache.jspwiki.log.LoggerFactory
> 	java.net.URLClassLoader$1.run(URLClassLoader.java:217)
> 	java.security.AccessController.doPrivileged(Native Method)
> 	java.net.URLClassLoader.findClass(URLClassLoader.java:205)
> 	org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java: 
> 134)
> 	org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java: 
> 66)
> 	java.lang.ClassLoader.loadClassInternal(ClassLoader.java:336)
> 	org.apache.jsp.Wiki_jsp.<init>(Wiki_jsp.java:15)
> 	sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> 	sun.reflect.NativeConstructorAccessorImpl.newInstance 
> (NativeConstructorAccessorImpl.java:57)
> 	sun.reflect.DelegatingConstructorAccessorImpl.newInstance 
> (DelegatingConstructorAccessorImpl.java:45)
> 	java.lang.reflect.Constructor.newInstance(Constructor.java:532)
> 	java.lang.Class.newInstance0(Class.java:372)
> 	java.lang.Class.newInstance(Class.java:325)
> 	org.apache.jasper.servlet.JspServletWrapper.getServlet 
> (JspServletWrapper.java:145)
> 	org.apache.jasper.servlet.JspServletWrapper.service 
> (JspServletWrapper.java:329)
> 	org.apache.jasper.servlet.JspServlet.serviceJspFile 
> (JspServlet.java:337)
> 	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
> 	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
> 	com.ecyrd.jspwiki.ui.WikiServletFilter.doFilter 
> (WikiServletFilter.java:175)
> 	com.ecyrd.jspwiki.ui.WikiJSPFilter.doFilter(WikiJSPFilter.java:111)
>
> *note* *The full stack trace of the root cause is available in the  
> Apache
> Tomcat/6.0.16 logs.*


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