ClassNotFoundException when using User Libraries in Eclipse build path

eclipse tomcat classnotfoundexception buildpath
user646584 picture user646584 · Aug 10, 2011 · Viewed 32.7k times · Source

I'm using Eclipse 3.7 (STS) with Tomcat 7 running inside the IDE. I've created a new Dynamic Web project and added a single JSP file to the web content root folder. I can run Tomcat and access the JSP from within Eclipse with no problems.

I've added a few 3rd party JAR's to the project from User Libraries (I'm not using maven or auto dependecies managment). In the JSP I reference a class from the project's JAR file, I can compile this with no problem, but when I deploy on Tomcat the JSP throws ClassNotFoundException. Clearly, Tomcat can't find the JAR's from my library settings. I tried creating a Run As configuration for Tomcat Server and I set the classpath to match the classpath settings of the project, but I still get the same classnotfound problem.

I could get around the issue by manually copying all project JARs to the WEB-INF/lib directory so the webapp can find all dependencies, but that's absurd and I don't expect that to be the solution since it's a maintenance nightmare.

Am I missing something?

Answer

BalusC picture BalusC · Aug 10, 2011

In project's properties, go to Deployment Assembly. Add there the buildpath entries as well which you've manually added as user libraries. It'll end up in /WEB-INF/lib of the deployed WAR.

enter image description here

Related questions

java.lang.ClassNotFoundException for servlet in tomcat with eclipse

I am starting to develop a java web application in eclipse using servlets and am testing it with tomcat server on my localhost. I have deployed the application in tomcat, but when I try to load the target url in …

Read More
eclipse/tomcat: deploy doesn't work any more (ClassNotFoundException)

I'm running Eclipse Helios Service Release 1, with Tomcat 7.0.12 in Linux Ubuntu Natty Narwhal. I've been happily hot re-deploying my webapp until it stopped working for apparently no reason. The following exception is displayed: SEVERE: Allocate exception for servlet Index java.…

Read More
ClassNotFoundException DispatcherServlet when launching Tomcat (Maven dependencies not copied to wtpwebapps)

I've run into this problem a few times and only just stumbled upon a (semi-) reliable solution, so thought I would post it here in case it helps anyone else, or in case I forget it, and also to ask …

Read More