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From Pid <...@pidster.com>
Subject Re: Tomcat in Eclipse Error 500 java.lang.ClassNotFoundException
Date Fri, 11 Jun 2010 09:21:26 GMT
On 11/06/2010 05:21, Vitalstatistix wrote:
> 
> Yeh that was just a dodgy hack to get around my initial errors when using
> javac. I found out later the reason why javac wasn't working on my servlet
> class was because servlet-api.jar wasn't on the classpath,
> after adding that I was able to compile it the normal way. Also the solution
> is NOT to put it in the WEB-INF folder, you need to have your .class file in
> the build/classes/<Yourpackage> folder. 

It'll eventually need to end up in

 WEB-INF/classes/my/package.AServlet.class

or, inside a jar, e.g.

 WEB-INF/lib/myservlets.jar

or you won't be able to deploy the web app...


p

> Pid * wrote:
>>
>> On 10/06/2010 03:20, Vitalstatistix wrote:
>>>
>>>
>>> SOLVED:
>>>
>>> There was no HelloServlet.class file so I had to put an empty main method
>>> into the HelloServlet.java class and run it to generate the
>>> HelloServlet.class file, then I placed the class file in the WEB-INF
>>> folder
>>> and it all worked fine.
>>
>> Er, what?
>>
>> 1. There's no need for an empty main method.
>> 2. We usually just compile a .java file to get a .class
>>
>>
>> p
>>
>>> Vitalstatistix wrote:
>>>>
>>>> Hey, I've just been working on this tutorial here:
>>>>
>>>> http://www.ibm.com/developerworks/opensource/library/os-eclipse-tomcat/index.html
>>>>
>>>> It has been pretty good and I've got the jsp page to show the time but
>>>> when I try going to the 
>>>> HelloServlet I get the error 500.
>>>>
>>>> http://www.ibm.com/developerworks/opensource/library/os-eclipse-tomcat/index.html
>>>>
>>>> Error Report
>>>> type Exception report
>>>>
>>>> message 
>>>>
>>>> description The server encountered an internal error () that prevented
>>>> it
>>>> from fulfilling this request.
>>>>
>>>> exception 
>>>>
>>>> javax.servlet.ServletException: Wrapper cannot find servlet class
>>>> com.example.servlets.HelloServlet or a class it depends on
>>>>
>>>> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
>>>>
>>>> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
>>>>
>>>> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
>>>>
>>>> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
>>>> 	org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
>>>> 	java.lang.Thread.run(Unknown Source)
>>>>
>>>>
>>>> root cause 
>>>>
>>>> java.lang.ClassNotFoundException: com.example.servlets.HelloServlet
>>>>
>>>> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1516)
>>>>
>>>> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1361)
>>>>
>>>> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
>>>>
>>>> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
>>>>
>>>> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
>>>>
>>>> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
>>>> 	org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
>>>> 	java.lang.Thread.run(Unknown Source)
>>>>
>>>>
>>>> web.xml file generated in my Eclipse web project
>>>>
>>>> <?xml version="1.0" encoding="UTF-8"?>
>>>> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>>>> xmlns="http://java.sun.com/xml/ns/javaee"
>>>> xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
>>>> xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
>>>> http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID"
>>>> version="2.5">
>>>>   <display-name>FirstWebProject</display-name>
>>>>   <welcome-file-list>
>>>>     <welcome-file>index.html</welcome-file>
>>>>     <welcome-file>index.htm</welcome-file>
>>>>     <welcome-file>index.jsp</welcome-file>
>>>>     <welcome-file>default.html</welcome-file>
>>>>     <welcome-file>default.htm</welcome-file>
>>>>     <welcome-file>default.jsp</welcome-file>
>>>>   </welcome-file-list>
>>>>   <servlet>
>>>>     <description></description>
>>>>     <display-name>HelloServlet</display-name>
>>>>     <servlet-name>HelloServlet</servlet-name>
>>>>     <servlet-class>com.example.servlets.HelloServlet</servlet-class>
>>>>   </servlet>
>>>>   <servlet-mapping>
>>>>     <servlet-name>HelloServlet</servlet-name>
>>>>     <url-pattern>/HelloServlet</url-pattern>
>>>>   </servlet-mapping>
>>>> </web-app>
>>>>
>>>>
>>>> Sorry I don't know how to add code tags in this forum. I'm using Tomcat
>>>> 6.
>>>> I've
>>>> made no changes to ANY web.xml files, I simply followed that short basic
>>>> tutorial step by step. My HelloServlet.java class is exactly the same as
>>>> in the tutorial and is in the same package. 
>>>> Could you please tell me why it can't seem to find the class?
>>>>
>>>> Thanks heaps,
>>>>
>>>> :)
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>
>>
>>
>>  
>>
> 



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