12 Replies Latest reply on Jul 4, 2007 2:18 AM by Andreas Schienagel

    [newbie] problem with hibernate mapping while trying to save

    knowbuddy wayne Newbie

      Hello,
      Working on JBoss IDE 2.0.0 BETA2 with jBPM 3.1.3, I was trying to store some data to my own table, instead of jbpm_variableinstance. The JUnit test ran perfectly, but an "org.hibernate.MappingException: Unknown entity" exception occurred while running on Tomcat 5.5 after deployment.
      Here goes the details:
      1. the table creation script:

      create table student (
       id varchar(100) not null default '',
       name varchar(20) default '',
       age int(11) default 0,
       primary key (id)
      );
      

      2. the corresponding Student classes (generated by hibernate synchronizer):
      package dgbdatamodel;
      ...
       // primary key
       private java.lang.String id;
      
       // fields
       private java.lang.String name;
       private java.lang.Integer age;
      ...
       // getters and setters
      

      3. the mapping file (also generated by hibernate synchronizer):
      <?xml version="1.0"?>
      <!DOCTYPE hibernate-mapping PUBLIC
       "-//Hibernate/Hibernate Mapping DTD//EN"
       "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
      
      <hibernate-mapping package="dgbdatamodel">
       <class
       name="Student"
       table="student"
       >
       <meta attribute="sync-DAO">false</meta>
       <id
       name="Id"
       type="string"
       column="id"
       >
       <generator class="uuid.hex"/>
       </id>
      
       <property
       name="Name"
       column="name"
       type="string"
       not-null="false"
       length="20"
       />
       <property
       name="Age"
       column="age"
       type="integer"
       not-null="false"
       length="11"
       />
       </class>
      </hibernate-mapping>
      

      I used the auto-generated simple process, and added the following code to the MessageActionHandler.execute function:
       stu = new Student();
       stu.setName("the hell");
       JbpmConfiguration cfg = JbpmConfiguration.getInstance();
       JbpmContext jbpmContext = cfg.createJbpmContext();
       try {
       // Invoke persistence operations here
       Session s = jbpmContext.getSession();
       s.save(stu);
       } finally {
       jbpmContext.close();
       }
      

      the 'stu' is a member variable of MessageActionHandler.

      I first ran the sample SimpleProcessTest as JUnit test, and got 2 students named "the hell" in the table student ('cos the action was called twice in the test). Then I used JBoss IDE to deploy the process. The deployed archive includes the process, MessageActionHandler, the dgbdatamodel package, hibernate.cfg.xml as well as Student.hbm.xml. After logging in in the browser I started a new 'simple' process, after input 'color' and 'size' and clicked "Save and Close Task" (and the action handler is called), i got
      javax.servlet.ServletException: Error calling action method of component with id taskform:transitionButton
      ...
      root cause
      javax.faces.FacesException: Error calling action method of component with id taskform:transitionButton
      ...
      

      the log says sth like:
      ...
      19:39:53,765 DEBUG [Services] closing service 'persistence': org.jbpm.persistence.db.DbPersistenceService@ec1e6f
      19:39:53,765 DEBUG [DbPersistenceService] committing hibernate transaction
      19:39:53,781 DEBUG [DbPersistenceService] closing hibernate session
      19:39:53,781 ERROR [GraphElement] action threw exception: Unknown entity: dgbdatamodel.Student
      org.hibernate.MappingException: Unknown entity: dgbdatamodel.Student
       at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:610)
       at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1246)
      ...
      

      I guess the deployed version didn't include the mapping declared in "Student.hbm.xml" (since if I don't call "s.save(stu)" in the action handler, no exception was thrown).
      I searched the forum for the answer, but in vain, the closest one I got is:
      http://www.jboss.com/index.html?module=bb&op=viewtopic&t=89365
      However, I just started learning jBPM and got stuck in here for quite a few days. Anyone's kind enough to give me some clues? Or what is the right way to do the job? Thanks a million!