Eclipse warning: XXXXXXXXXXX.jar will not be exported or published. Runtime ClassNotFoundExceptions may result

Question

I keep getting the following error after I put the required files in my build path on Eclipse. I am working on a Spring MVC Hello World Application and using Eclipse Helios

Answer 1

When adding new jar files, I got two messages on Eclipse's Problems Tab: one error and one warning. I only solved this problem when combining all previous solutions with an extra step. Here's how I solved it:

1. "Drag and drop" the files that I want in my classpath/dependencies into my WEB-INF/lib/ folder;
2. Right-click on your project in the Package Explorer tab, and build path --> configure build path --> external jars, adding the desired files;
3. Restarted Eclipse;
4. Select Project --> Clean…. My system is configured to build automatically, so after this step, the error message was gone, but the warning XXXXXXXXXXX.jar will not be exported or published. Runtime ClassNotFoundExceptions may result remained;
5. Right-click on warning message --> Quick Fix;
6. Select the option Mark the associated raw classpath entry as a publish/export dependency. (in the following figure)