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

    [newbie] problem with hibernate mapping while trying to save

    colablade
    colablade Jul 1, 2007 8:19 AM

      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!


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