Since this is a common problem that ends up getting asked a lot, and there
are few published good ways to go about it... it turns out orion has a
file in the news app called "counter.jar" that does just this. Here's the
quick-and-dirty on its use:
1) Add the counter.jar to the application.xml file as an ejb module.
2) Make sure that the ejb-jar.xml contains a reference to the Counter
bean, which should look something like this:
<ejb-ref>
<description>The id counter for the
entity</description>
<ejb-ref-name>ejb/Counter</ejb-ref-name>
<ejb-ref-type>Entity</ejb-ref-type>
<home>com.evermind.ejb.CounterHome</home>
<remote>com.evermind.ejb.Counter</remote>
</ejb-ref>
3) In your EJB code, have this kind of sequence:
public void ejbCreate() throws RemoteException, CreateException
{
try
{
CounterHome chome=(CounterHome)new
InitialContext().lookup("java:comp/env/ejb/Counter");
Counter ctr;
try
{
ctr=chome.findByPrimaryKey("mybeannameid");
}
catch(FinderException fe)
{
ctr=chome.create("mybeannameid");
}
id=ctr.getNextID());
}
catch(NamingException ne)
{
throw new CreateException("NamingException:\nCould not"+
" create EJB: "+ne.getMessage());
}
}
This will set id - a long - to the next available sequence.
-----------------------------------------------------------
Joseph B. Ottinger [EMAIL PROTECTED]
http://cupid.suninternet.com/~joeo HOMES.COM Developer
