> Christian,
>
> Have you tried specifying the key generator only on the Person
> object and not on the Kunde object?
>
> Bruce
Thanks for your help, Bruce. It now is working :)
But as I solved this problem, I got another one instead...
I've got a Class, that has all methods I need to store and load objects from
the Database.
It looks roughly like this:
// BEGIN CLASS
public class DbBackend {
private Logger logger = null;
private JDO jdo = null;
private Database database = null;
public IR_Datenbank(String xmlDbSchema, String dbName) throws Exception {
jdo = new JDO(dbName);
jdo.setConfiguration(xmlDbSchema);
jdo.setDatabaseName(dbName);
database = jdo.getDatabase();
database.setAutoStore(true);
}
public void insertObject(Object object) throws Exception {
database.begin();
database.create(object);
database.commit();
}
}
// END CLASS
And I've written a Test class, to test, if I can insert, update and load
objects from the database.
In this class, I execute this code:
// Create a Kunde object
Kunde kunde = createTestKunde();
// Database backend
DbBacken backend = new DbBackend("src/jvfa/test/database.xml", "jvfa");
// Insert the kunde into the database
backend.insertObject(kunde);
That works fine. The Kunde object gets perfectly written to the database.
But now it comes. When I try to access the fields of my kunde-object
(e.g. to find out what ID was generated by the key-generator) after
the insert, I got an Exception. I've debugged it, and found out, that
a DataObjectAccessException is thrown in TransactionContext.create().
I simply added after "backend.insertObject(kunde)" the following line :
System.out.println("Generated ID:");
System.out.println(kunde.getId());
And then I got the exception. The most curious thing is:
I've set a breakpoint after the insertObject() method. But he never arrives
there.
Even the System.out.println("Generated ID:") is not executed.
My Idea is, that the database.create() method is threaded and the code is
executed at the
same time. So Castor has a lock on the Kunde object that protects access on
it.
What do I have to do, that the insertObject() method waits until Castor has
finished it's
transaction and I can access the Kunde object.
Thanks for your help and sorry for my bad English,
Christian
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