java.lang.ClassNotFoundException: org.hibernate.cfg.AnnotationConfiguration

Question

I'v got the following problem: I tried to create a simple Servlep with Eclipse:

@WebServlet(description = "Adress book servlet", urlPatterns = {"/new_address"})
public class CAddressBookServlet extends HttpServlet 
{
    public CAddressBookServlet() 
    {
        super();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {}
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {}
    private static final long serialVersionUID = 1L;
}

And it works fine with Tomcat! But then I was to add Hibernate functionality into my project. I add just one line to servlet contructor:

@WebServlet(description = "Adress book servlet", urlPatterns = {"/new_address"})
public class CAddressBookServlet extends HttpServlet 
{
    public CAddressBookServlet() 
    {
        super();
        new AnnotationConfiguration();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {}
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {}
    private static final long serialVersionUID = 1L;
}

Which cause the following error:

HTTP Status 500 - Error instantiating servlet class org.servlets.CAddressBookServlet

---

type Exception report

message Error instantiating servlet class org.servlets.CAddressBookServlet

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Error instantiating servlet class org.servlets.CAddressBookServlet org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:931) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) java.lang.Thread.run(Unknown Source)

root cause

java.lang.NoClassDefFoundError: org/hibernate/cfg/AnnotationConfiguration org.servlets.CAddressBookServlet.(CAddressBookServlet.java:33) sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) java.lang.reflect.Constructor.newInstance(Unknown Source) java.lang.Class.newInstance0(Unknown Source) java.lang.Class.newInstance(Unknown Source) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:931) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) java.lang.Thread.run(Unknown Source)

root cause

java.lang.ClassNotFoundException: org.hibernate.cfg.AnnotationConfiguration org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559) org.servlets.CAddressBookServlet.(CAddressBookServlet.java:33) sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) java.lang.reflect.Constructor.newInstance(Unknown Source) java.lang.Class.newInstance0(Unknown Source) java.lang.Class.newInstance(Unknown Source) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:931) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) java.lang.Thread.run(Unknown Source)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.33 logs.

How can I make hibernate working with my servlet?

Answer 1

@Perception has the right answer. You need to include the Hibernate libraries with your deployed war file. You can put them in WEB-INF/lib or in the Tomcat endorsed directory. I prefer the WEB-INF/lib location, so you don't interfere with any other applications on the server.

Answer 2

I think you are missing the annotations jar. Download the Annotations

Copy the downloaded jar file to one of these locations....

 -> Tomcat lib directory
          or
 -> To the folder webapps/< your_project >/WEB-INF/lib  

And restart the server