Configuring Hibernate in Eclipse Indigo

Question

I am working on a web based project.

When I startup my tomcat server it redirects to an Login HTML page. On click of a login link a JSP Page is called. All the validation is done in the JSP page. Here Hibernate is used to interact with the database.

Problem:

On click of the login link, a ClassNotFoundException for the class MetadataProvider and ReflectionManager is thrown. Both the classes belong to the hibernate-annotations-common jar.

I have tried installing hibernate by updating my eclipse, by manually downloading the jar files and adding it to the web-inf/lib folder but still the same exception pops up.

Has it got anything to do with eclipse indigo 64 bit/windows 7 64 bit/tomcat 7? I found out previously that the eclipse is different for 32 bit and 64 bit. Is it the same for hibernate?

---

Added all the jars to the run configurations of the project and to my surprise it worked. I was of the opinion that the jars are pickup from the web-inf library. But I removed all the jars from there and added it on the run configurations and it works.

In the precious application I worked the jars were there in the web-inf lib folder and the run configurations had only the tomcat jars and it still worked. How was that possible?