Servlet引用了Maven项目-NoClassDefFoundError

Question

I have a Maven project that uses Hibernate and PostgreSQL, and it's working fine on it's own. Now I want to use some classes from this project (essentially the database) in a servlet, but now things break.

I get a java.lang.NoClassDefFoundError: javax/persistence/Persistence error when accessing the servlet in Tomcat.

I'm thinking that somehow the Maven dependencies don't get "forwarded" to the servlet project, but I don't know what to do about it. I've added the Maven project to the servlet build path, and also to its "Web Deployment Assembly"... what more do I need to do?

Answer 1

Please try this dependency.

<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
<version>1.0.1.Final-redhat-3</version>
</dependency>

Answer 2

1.Check for all the jars, make sure that all the dependencies are added.

2.Clean your tomcat

Try adding Runtime dependencies.

3.Right click on your project and select Properties-> Deployment Assembly

• click on Add
• select Java Build Path Entries
• select Maven Dependencies
• Finish

Re-run your server.

Hope this helps!!