Client Program accessing J2EE entity Bean

Question

I have trouble find my Course J2EE bean from a client. (The client
runs on the same computer but a different VM from the bean.)
In Glassfish (Sun Application Server Nine), I set up a simple
Container-Managed Entity Bean. I tried to access it from an external
client as described in the glassfish EJB
FAQ https://glassfish.dev.java.net/javaee5/ejb/EJB-FAQ.html
Here is the client program:
package RS;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.xml.parsers.*;
import org.apache.xml.serialize.*;
import org.w3c.dom.*;
import org.xml.sax.*;
import RS.CourseHome;
import RS.CoursePK;
import javax.naming.InitialContext;
import javax.naming.Context;
import javax.naming.NamingException;
import java.rmi.RemoteException;
import javax.rmi.*;
import java.util.Properties;
import Debug.*;
public class Client {
public static void main (String arg[]) throws IOException {
try {
InitialContext jndiContext = new InitialContext ();
Debug.P("jndic ongtext" + jndiContext);
Object o = jndiContext.lookup("RS.CourseHome");
Debug.P("looked up object "+o + "|"+o.getClass().getName());
RS.CourseHome home =
    (RS.CourseHome)PortableRemoteObject.narrow(o,RS.CourseHome.class);
Debug.P("got home "+home);
Course C = home.create(1);
C.setName("blah");
CoursePK PK = new CoursePK();
PK.number=1;
C = home.findByPrimaryKey(PK);
Debug.P(C.getName());
catch (java.rmi.RemoteException re) {Debug.P("Remote Exception" + re.getMessage());}
catch (javax.naming.NamingException ne){Debug.P("Naming Exception"+ne.getMessage());}
catch (javax.ejb.CreateException ce){Debug.P("Create Exception"+ce.getMessage());}
catch (javax.ejb.FinderException fe){Debug.P("Finder Exception"+fe.getMessage());}
}Here is the error message:
Exception in thread "main" java.lang.ClassCastException
at com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject.narrow
                   (PortableRemoteObject.java:294)
  at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)
  at RS.Client.main(Client.java:26)The debugging indicates that I got the Initial Context
and got the object but the PortableObject.narrow failed:
jndic ongtextjavax.naming.InitialContext@1d85f79
looked up object IOR: (huge number deleted)
com.sun.corba.ee.impl.corba.CORBAObjectImplEarlier, I tried the version below, but based on the suggestion by Mr. Ebbert
in the forum started "Error When running the Client Program" by sree_devi,
I checked
the following. I went to "Jndi Tree Browsing" from the Administrative Console
and I found a "RS.CourseHome" entry under "ejb" I found RS.CourseHome there
but did not see the "Course" tghat I expected to see
Thus, I tried the version above:
package RS;
   --- imports deleted for conciseness
import Debug.*;
public class Client {
public static void main (String arg[]) throws IOException {
try {
InitialContext jndiContext = new InitialContext ();
Object o = jndiContext.lookup("Course");
CourseHome home =
    (CourseHome)PortableRemoteObject.narrow(o,CourseHome.class);
Course C = home.create(1);
C.setName("blah");
CoursePK PK = new CoursePK();
PK.number=1;
C = home.findByPrimaryKey(PK);
Debug.P(C.getName());
catch (java.rmi.RemoteException re) {Debug.P("Remote Exception" + re.getMessage());}
catch (javax.naming.NamingException ne){Debug.P("Naming Exception"+ne.getMessage());}
catch (javax.ejb.CreateException ce){Debug.P("Create Exception"+ce.getMessage());}
catch (javax.ejb.FinderException fe){Debug.P("Finder Exception"+fe.getMessage());}
}When I run it, I get the following Naming Exception: Course not found
I confirmed at the administrative console, that I have "Course" listed
under Enterprise Applications:
As per the ejb FAQ, I set up my $CLASSPATH so it starts as follows:
/opt/j2ee/SUNWappserver/lib/appserv-rt.jar:
/opt/j2ee/SUNWappserver/lib/javaee.jar:I also verifed in my domain.xml that the orb-listener-1, the default
naming service port was at 3700.
Here is the info on the Bean that I have running for both of the tries
at my Client code.
ejb-jar.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<ejb-jar xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/ejb-jar_2_1.xsd"
version="2.1">
  <enterprise-beans>
    <entity>
       <description>Course</description>
       <display-name>CourseBean</display-name>
       <ejb-name>CourseBean</ejb-name>
       <home>RS.CourseHome</home>
       <remote>RS.Course</remote>
       <ejb-class>RS.CourseBean</ejb-class>
       <persistence-type>Container</persistence-type>
       <prim-key-class>RS.CoursePK</prim-key-class>
       <reentrant>false</reentrant>
       <abstract-schema-name>Course</abstract-schema-name>
       <cmp-field><field-name>number</field-name></cmp-field>
       <cmp-field><field-name>name</field-name></cmp-field>
    </entity>
  </enterprise-beans>
  <assembly-descriptor>
     <security-role>
        <description>Everyone</description>
       <role-name>everyone</role-name>
     </security-role>
     <method-permission>
        <unchecked/>
        <method>
           <ejb-name>CourseBean</ejb-name>
           <method-name>*</method-name>
        </method>
      </method-permission>
     <container-transaction>
        <method>
           <ejb-name>CourseBean</ejb-name>
           <method-name>*</method-name>
        </method>
        <trans-attribute>Required</trans-attribute>
     </container-transaction>
  </assembly-descriptor>
</ejb-jar>
Sun-ejb-jar.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sun-ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Application Server 8.1 EJB 2.1//EN"
"http://www.sun.com/software/appserver/dtds/sun-ejb-jar_2_1-1.dtd">
<sun-ejb-jar>
  <enterprise-beans>
     <name>CourseBean</name>
     <ejb>
       <ejb-name>CourseBean</ejb-name>
       <jndi-name>Course</jndi-name>
     </ejb>
  <cmp-resource>
     <jndi-name>jdbc/__default</jndi-name>
     <create-tables-at-deploy>true</create-tables-at-deploy>
     <drop-tables-at-undeploy>true</drop-tables-at-undeploy>
  </cmp-resource>
  </enterprise-beans>
</sun-ejb-jar>
Course.java
package RS;
import java.rmi.RemoteException;
public interface Course extends javax.ejb.EJBObject {
  public String getName() throws RemoteException;
  public void setName (String Str) throws RemoteException;
  public int getNumber() throws RemoteException;
  public void setNumber (int n) throws RemoteException;
CourseHome.java
package RS;
import java.rmi.RemoteException;
import javax.ejb.CreateException;
import javax.ejb.FinderException;
public interface CourseHome extends javax.ejb.EJBHome {
public Course create(int id) throws
CreateException,RemoteException;
public Course findByPrimaryKey(CoursePK pk)
throws FinderException,RemoteException;
CourseBean.java
package RS;
import javax.ejb.EntityContext;
public abstract class CourseBean implements javax.ejb.EntityBean {
public CoursePK ejbCreate (int number) throws javax.ejb.CreateException{
  this.setNumber(number);
  return null;
public void ejbPostCreate (int number) {
public abstract String getName();
public abstract void setName (String str);
public abstract int getNumber ();
public abstract void setNumber (int number);
public void setEntityContext (EntityContext ctx) {}
public void unsetEntityContext() {}
public void ejbActivate () {}
public void ejbPassivate () {}
public void ejbLoad () {}
public void ejbStore () {}
public void ejbRemove() {}
}Laurence L. Leff, Ph.D. Associate Professor of Computer Science
Western Illinois University, 1 University Circle 61455, Pager: 309 367 0787
FAX [phone]

Answer 1

hi s-mcgowan,
"some other processing" comprises of printing of debug lines and publishing to the message queue using JMS. I added more debug lines so that i could see whats really happening... here is the result
myTableHome.create(...); <----------- no exception was thrown and it returned LocalMyTable object
print out "Insert successful"
print out "publishing message"
... publish message to message queue using JMS...
print out "Publish done"
... after few milliseconds...
java.sql.BatchUpdateException: Data exception -- row already exist in index PK_MYTABLE on table MYTABLE.
From the exception it seems like its doing a batch insert. So that seems to explain why the java.sql.BatchUpdateException is thrown few milliseconds after my call to myTableHome.create(...);
Is it possible to disable batch update / insert? how?
thanks in advance,
leigh