EJB Programming Problem

Question

I have a project:
create table contacts (id int(10) auto_increment,
user varchar(100),
contact_name(100),
primary key (id))
the session bean :
ContactBookBean{
public void addPersonalContact(java.lang.String username) {
String contactname=username;
try
Context ctx= new InitialContext();
Object objref=ctx.lookup("java:comp/env/ejb/contacts");
LocalcontactsHome localcontactshome =(LocalcontactsHome)PortableRemoteObject.narrow(objref,LocalcontactsHome.class);
localcontactshome.create(new Integer(0),username,contactname);
}catch(Exception e){
throw new EJBException(e);
the cmp entity bean contactsBean{
public java.lang.Integer ejbCreate(java.lang.Integer id, java.lang.String user, java.lang.String contactName) throws javax.ejb.CreateException {
setId(id);
setUser(user);
setContactName(contactName);
return null;
the test client
Context ctx = new InitialContext();
ContactBookHome home=(ContactBookHome)PortableRemoteObject.narrow(ctx.lookup("ContactBook"),ContactBookHome.class);
ContactBook test=home.create();
test.addPersonalContact("[email protected]");
I want insert a record into the database.The deployment is no problem.
but when i run the client the IDE throws Exception:
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.RemoteException: nested exception is: javax.ejb.TransactionRolledbackLocalException: Exception thrown from bean; nested exception is: javax.ejb.EJBException: nested exception is: java.sql.SQLException: Syntax error or access violation: You have an error in your SQL syntax near '"contacts" WHERE "id" = 0 ' at line 1;
IDE:Sun forte for java
Database:Mysql
OS:Sun Solaris
Appserver:RI in forte
I do not know how to deal with the variable "id"
that is :auto_increment pri_key(id) .
Help is appreciated ,thanks.

Answer 1

Your EJBCreate method is specifing an id, when your database is auto assigning the index. That is what is causing your SQLException. Either do not specify the id in the method signature, or turn off auto assignment in the database.
tj...