Problem in config. JPA in JBOSS

[kadumbadi kutty]

Hi friends,

I have developed application using JPA,Struts and Tomcat.
it works fine, i changed my application server as JBOSS-4.x.

I am new to JPA, so i am not able config. JPA persistence.xml with JBOSS.
Its not looking the persistance.xml generated by me, it gives ClassCastException.

Please Help.....

:roll:

[Peter Johnson]

Please post the full stack trace for the exception. Also post the persistence.xml file.

[Rade Treci]

I have a similar problem.
Here is my persistnece.xml :

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
	<persistence-unit name="admin">
		<provider>org.hibernate.ejb.HibernatePersistence</provider>
		<class>my.pkg.web.dao.Users</class>
		<properties>
		   <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"/>
		   <property name="connection.pool_size" value="1"/>
		   <property name="cache.provider_class" value="org.hibernate.cache.NoCacheProvider" />
		   <property name="hibernate.show_sql" value="false" />
		   <property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver" />
		   <property name="hibernate.connection.url" value="jdbc:oracle:thin:@myserver:1521:cvi" />
		   <property name="hibernate.connection.username" value="username" />
		   <property name="hibernate.connection.password" value="password" />
		</properties>
	</persistence-unit>
</persistence>

I have put the META-INF folder (which contains persistance.xml, manifest.mf and orm.xml files) under src folder.
The source file(s) (e.g. User.java) is(are) located in src/main/java/my/pkg/web/dao.

The error i get, when trying to access my page is (sending the stack trace):

java.lang.NoClassDefFoundError: WEB-INF/classes/my/pkg/web/dao/User(wrong name: my/pkg/web/dao/User)
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(ClassLoader.java:621)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
java.net.URLClassLoader.access$000(URLClassLoader.java:56)
java.net.URLClassLoader$1.run(URLClassLoader.java:195)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(URLClassLoader.java:188)
org.jboss.mx.loading.RepositoryClassLoader.findClassLocally(RepositoryClassLoader.java:690)
org.jboss.mx.loading.RepositoryClassLoader.findClass(RepositoryClassLoader.java:670)
java.lang.ClassLoader.loadClass(ClassLoader.java:307)
org.jboss.mx.loading.RepositoryClassLoader.loadClassLocally(RepositoryClassLoader.java:200)
org.jboss.mx.loading.UnifiedLoaderRepository3.loadClassFromClassLoader(UnifiedLoaderRepository3.java:312)
org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:189)
org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:521)
org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:415)
java.lang.ClassLoader.loadClass(ClassLoader.java:300)
java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:592)
java.lang.ClassLoader.loadClass(ClassLoader.java:252)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1345)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Class.java:247)
org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:135)
org.hibernate.ejb.Ejb3Configuration.classForName(Ejb3Configuration.java:1009)
org.hibernate.ejb.Ejb3Configuration.addNamedAnnotatedClasses(Ejb3Configuration.java:1081)
org.hibernate.ejb.Ejb3Configuration.addClassesToSessionFactory(Ejb3Configuration.java:871)
org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:758)
org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:191)
org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:253)
org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:125)
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:52)
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)
srcsi.ezk.web.actions.preview.Preview.getMockUsers(Preview.java:37)
srcsi.ezk.web.actions.preview.Preview.executeAction(Preview.java:30)
srcsi.web.action.GlobalAction.executeCustom(Unknown Source)
srcsi.web.action.CustomAction.execute(Unknown Source)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
srcsi.web.filter.DefaultFilter.doFilter(Unknown Source)
srcsi.web.filter.EncodingFilter.doFilter(Unknown Source)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

Thanks in advance.

[Peter Johnson]

I think what the error message is saying is that it expected to find the User class in a certain directory within the WAR file, but could not.

Are you building a WAR or an EAR? What are the contents of the WAR/EAR? (You can find this out by running the jar utility with the -tf option.)

Are you deploying and running the app in an IDE, such as Eclipse, or are you deploying manually?

[Rade Treci]

Thanks for reply.

I forgot to say that I'm deploying (and running) the application in Eclipse 3.4 (JDK 6 , JBoss 4.2).
The path to User.java in the deployement folder is:

- project.war / WEB-INF / classes / my / pkg / web / dao / User.class

So I really don't know what to do here.

EDIT: Oh yeah, one more thing I pointed (changed the server settings in Eclipse) JBoss to a custom deploy folder so the project.war mentioned above, IS a folder.

[Peter Johnson]

1) Is there any way you could do this manually rather than relying on Eclipse to do the build and deploy? I suspect that it is an Eclipse issue and that doing things manually would yield better results.

2) Also, is this the first such app you have tried? What other Java EE apps have you built and deployed using Eclipse?

3) Are you using JBoss Tools?

[Rade Treci]

1) Probaly there is but it is required of me to use strictly Eclipse enviroment ...

2) It is first of this kind (JBoss + JPA(Hibernate) combination)

3) Yes.

I was working on this today a few hours and cleaned and imported the libs again etc and now i get another (different) error :
Heres the stack trace:

javax.persistence.PersistenceException: [PersistenceUnit: admin] class or package not found
	at org.hibernate.ejb.Ejb3Configuration.addNamedAnnotatedClasses(Ejb3Configuration.java:1089)
	at org.hibernate.ejb.Ejb3Configuration.addClassesToSessionFactory(Ejb3Configuration.java:886)
	at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:772)
	at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:183)
	at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:240)
	at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:120)
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51)
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:33)
	at my.pkg.web.actions.preview.Preview.getMockUsers(Preview.java:38)
	at my.pkg.web.actions.preview.Preview.executeAction(Preview.java:30)
	at my.pkg.action.GlobalAction.executeCustom(GlobalAction.java:200)
	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
	at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
	at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: No ClassLoaders found for: WEB-INF.classes.my.pkg.web.dao.User
	at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:212)
	at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:521)
	at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:415)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:247)
	at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:112)
	at org.hibernate.ejb.Ejb3Configuration.classForName(Ejb3Configuration.java:1005)
	at org.hibernate.ejb.Ejb3Configuration.addNamedAnnotatedClasses(Ejb3Configuration.java:1077)
	... 41 more

I think that the problem is maybe that the persistance.xml can't be seen...or maybe I'm missing something else ?

Here is the code of Preview.java class (which actually causes the crash) :

package my.pkg.web.actions.preview;

import java.util.ArrayList;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;


import my.pkg.web.action.GlobalAction;
import my.pkg.web.commons.users.SpecUser;
import my.pkg.web.dao.User;
import my.pkg.action.ActionMapping;

public class Preview extends GlobalAction{

	private static final String USERS = "users";

	@Override
  public ActionForward executeAction(ActionMapping mapping, ActionForm form, HttpServletRequest request, 
      HttpServletResponse response) throws Exception {	  
		HttpSession session = request.getSession();
		
		ArrayList<SpecUser> al = getMockUsers();
		session.setAttribute(USERS, al);
                return mapping.findForward("success");
   }
	
	private ArrayList<SpecUser> getMockUsers(){
		
		EntityManagerFactory emf = Persistence.createEntityManagerFactory("admin");
		EntityManager em = emf.createEntityManager();
		
		User user = em.find(User.class, Long.valueOf(1));
		ArrayList<SpecUser> al = new ArrayList<SpecUser>();

		SpecUser su = new SpecUser();
		su.setName(user.getName());
		su.setLastName(user.getLastName());
		su.setUserType(user.getUserType());
		su.setUserGroup("Administrator");
		
		al.add(su);
		
                return al;
    }
}
		

I'm a JPA beginner so I'm on really unstable ground here , so every help is appreciated.

[Peter Johnson]

Try removing the "class" entry from the persistence.xml file. If your User class is properly annotated, you don't need that entry.

Also, post the contents of your war file (or directory). The WAR directory might be in a subdirectory of workspace/.metadata/.plugins/org.jboss.ide.eclipse.as.core (this is where things get tricky - I don't have the exact same version of Eclipse you have. If you were doing things manually I could tell you exactly where to look, but since you insist on working within Eclipse you will have to find where things are located on your machine. I can tell you where things appear for me, but it might not match.)

[Rade Treci]

When i remove the "class" entry from the persistence.xml file i get the same exception which I posted yesterday.

The contents of the war directory :

my-project.war \
       |---css\
             |--- <some css stuff>
       |---js\
             |--- <some js stuff>
       |---META-INF\
             |--- MANIFEST.MF
             |--- orm.xml
             |--- persistence.xml
       |---WEB-INF\
             |--- certificates\
                       |--- <some cert>
             |--- classes\
                       |--- my\
                               |--- pkg\
                                       |--- web\
                                                |--- action\
                                                           |--- GlobalAction.class
                                                |--- actions\
                                                           |--- edit\
                                                           |--- preview\
                                                                      |--- Preview.class
                                                |--- commons\
                                                           |--- users\
                                                                      |--- SpecUser.class
                                                |--- dao\
                                                        |--- User.class
                                                |--- filters\
                                                           |--- <some classes>
                                                |--- forms\
                                                           |--- <some classes>
                                                |--- security\
                                                           |--- <some classes>
             |--- config\
                       |--- application.properties
                       |--- ehcache-default.xml
                       |--- log4j.properties
             |--- lib\
                       |--- <some jars>
             |--- pages\
                       |--- <some jsp pages>
             |--- spring\
                       |--- application-context.xml
                       |--- http-context.xml
                       |--- jdbc-context.xml
                       |--- messages-context.xml
                       |--- security-context.xml
                       |--- upload-context.xml
             |--- tlds\
                       |--- struts-bean.tld
                       |--- struts-html.tld
                       |--- struts-logic.tld
                       |--- struts-tiles.tld
             |--- struts-config.xml
             |--- tiles-defs.xml
             |--- web.xml
       |--- favicon.ico
       |--- index.jsp
       |--- empty.jsp

[Rade Treci]

Also I forgot to tell you that META-INF folder also exists in the src folder of the Java project in Eclipse.

src\
  |--- main\
              |--- java
                       |--- my
                               |--- pkg
                                       |--- web
                                                ... rest of the path is same as in war ...
  |--- META-INF
              |--- MANIFEST.MF  
              |--- orm.xml  
              |--- persistence.xml  

I copied the META-INF folder to public_html folder (to be included in war) I don't know is it ok

[Jaikiran Pai]

Post the contents of orm.xml.

[Rade Treci]

Contents of orm.xml

<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_1_0.xsd" version="1.0">
</entity-mappings>

[Paréj Péter]

Vote! We are having exactly the same problem... Any solution since then?

[Jaikiran Pai]

my-project.war \  
       |---META-INF\  
             |--- MANIFEST.MF  
             |--- orm.xml  
             |--- persistence.xml

You are packaging the persistence.xml in the .war/META-INF. The spec doesn't allow this. Try packaging the persistence.xml (and orm.xml) in .war/WEB-INF/classes/META-INF or in the META-INF of some jar file under .war/WEB-INF/lib/

By the way, i would have expected the persistence.xml to be ignored when it's in .war/META-INF, instead of throwing this exception

P.S: Your orm.xml doesn't contain anything, so you can even delete it.

[Rade Treci]

10 min ago I solved it and exactly that was the problem (thanks Jaikiran Pai for pointing this out).

The root of the problem was that I've put the META-INF folder directly under .war/ folder instead under WEB-INF/classes , where it really should go. As soon I realized this and copied under WEB-INF/classes it worked and I didn't got any exceptions.

Thank you, again, all for your help.

P.S: Your orm.xml doesn't contain anything, so you can even delete it.

PS: Deleted it, works fine