How to run Spring 3.0 PetClinic in tomcat with Hibernate backed JPA

OK, this probably is supposed to be the easiest thing in the world, but I've been trying for the entire day, and it's still not working.. Any help is highly appreciated!

EDIT: For the correct procedure, please see Pascal's answer.

My wrong (since I did not disabled LoadTimeWeaving) procedure is left for reference..:

What I did:

1. Downloaded Tomcat 6.0.26 & Spring 3.0.1
2. Downloaded PetClinic from https://src.springframework.org/svn/spring-samples/petclinic
3. Built & deployed petclinic.war. Ran fine with default JDBC persistence.
4. Edited webapps/WEB-INF/spring/applicationContext-jpa.xml and set jpaVendorAdaptor to Hibernate.
5. Edited webapps/WEB-INF/web.xml and changed context-param from applicationContext-jdbc.xml to applicationContext-jpa.xml
6. Copied everything in the Spring 3.0.1 distribution to TOMCAT_HOME/lib.

7. Launched tomcat. Saw

   Caused by: java.lang.IllegalStateException: ClassLoader [org.apache.catalina.loader.WebappClassLoader] does NOT provide an 'addTransformer(ClassFileTransformer)' method. Specify a custom LoadTimeWeaver or start your Java virtual machine with Spring's agent: -javaagent:spring-agent.jar

8. Uncommented line <Loader loaderClass="org.sp开发者_JAVA技巧ringframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader"/> in webapps/META-INF/context.xml.

9. Same error. Added that line to TOMCAT_HOME/context.xml

10. Deployed without error. However, when I do something it will issue an error saying

    java.lang.NoClassDefFoundError: javax/transaction/SystemException at org.hibernate.ejb.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:39)

    11.Changed scope of javax.transaction from test to default (just deleted test), as suggested by scaffman.

    12.Runs fine!! Thank you!

Ok, here is what I did:

1. Get Tomcat 6.0.26

2. Checkout the petclinic sample:

   svn co https://src.springframework.org/svn/spring-samples/petclinic/trunk/ petclinic
   

3. cd into the petclinic directory

4. Modify src/main/webapp/WEB-INF/spring/applicationContext-jpa.xml to use Hibernate:
   • COMMENT the <context:load-time-weaver> (load-time weaver SHOULD NOT be used with Hibernate, this is for Toplink)
   • Declare Hibernate as jpaVendorAdapter (comment the Toplink part, uncomment the Hibernate part)
5. Modify the src/main/webapp/WEB-INF/web.xml to use the applicationContext-jpa.xml

6. Modify the pom.xml to bundle jta.jar in the war (as pointed out by @skaffman):

   <dependency>
     <groupId>javax.transaction</groupId>
     <artifactId>com.springsource.javax.transaction</artifactId>
     <version>1.1.0</version>
     <!--scope>test</scope-->
   </dependency>
   

7. Build the war

   mvn install
   

8. Deploy it to Tomcat

   cp target/petclinic.war $TOMCAT_HOME/webapps
   

9. Browse

   http://localhost:8080/petclinic
   

Looks like a problem with PetClinic packaging:

http://forum.springsource.org/showthread.php?t=85042

and

http://jira.springframework.org/browse/SPR-6880

There's fix in there for the pom.xml