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NoClassDefFoundError when accessing global classes

Alan Yap
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Joined: Feb 24, 2006
Posts: 32
I've just installed Tomcat 5.5 into "c:\tomcat5.5" folder and been toying around with it the whole day. Tried migrating some of webapps that I did before (and ran quite well in Resin) over to Tomcat, but stumbled upon some errors. I suspect Tomcat might have failed to locate my class files.

This prompts me to start from a clean slate to test it with a new webapp.

I've created a webapp named "mytest", with the following files:

C:\tomcat5.5\webapps\ROOT\WEB-INF\classes\testpack\testobject.class
C:\tomcat5.5\webapps\ROOT\WEB-INF\classes\testpack\testobject.java
c:\mytest\main.jsp (and its content below)



The above throws a NoClassDefFoundError exception. When I moved "testpack\testobject.class" into "c:\mytest\WEB-INF\classes" folder, only then everything is solved.

I have many packages that need to be shared among my webapps, so what is the problem that caused my Tomcat unable to detect them when I put them all inside "C:\tomcat5.5\webapps\ROOT\WEB-INF\classes" ?

Below are the fragments from my CLASSPATH. Anything that I missed out in the configuration?

.;C:\tomcat5.5\common\lib\servlet-api.jar;c:\tomcat5.5\common\lib\jsp-api.jar;

[ September 11, 2008: Message edited by: Alan Yap ]

[ September 11, 2008: Message edited by: Alan Yap ]
[ September 11, 2008: Message edited by: Alan Yap ]

When I'm not coding.. I do THIS
William Brogden
Author and all-around good cowpoke
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Joined: Mar 22, 2000
Posts: 12789
    
    5
Your Tomcat installation probably has a file named class-loader-howto.html under tomcat-docs.

That file should clarify everything.

Bill
Alan Yap
Ranch Hand

Joined: Feb 24, 2006
Posts: 32
Thanks Bill!

That howto file you suggested me to read enlightened me alot. My problem is all solved now. I've dunked my class files into "c:\tomcat55\common\classes" and it worked.

Before I started this thread, I was advised by the link below to put all my shared classes into "c:\<tomcat folder>\webapps\ROOT\WEB-INF\classes" folder to conform to the "standard". Doesn't apply to my case though.

http://www.coreservlets.com/Apache-Tomcat-Tutorial/tomcat-5.5.html#Test1
 
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subject: NoClassDefFoundError when accessing global classes