EJB 2.x and EJB 3 coexisting

[Joe Harry]

Guys,

I have a scenario where the new requirements are being developed using EJB 3 Stateless beans with the old EJB 2.x CMP Entity beans. The question I have is that I read from the book EJB 3 in Action that I just need to change the ejb-jar.xml file as,

<?xml version = '1.0' encoding = 'windows-1252'?>
<ejb-jar version="3.0"
xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
<a href="http://java.sun.com/xml/ns/j2ee/ejb-jar_3_0.xsd">" target="_blank" rel="nofollow">http://java.sun.com/xml/ns/j2ee/ejb-jar_3_0.xsd"></a>
...
</ejb-jar>

But we do not use Schema rather a DTD as below,

<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">

So in the above case, is it just enough to change the 2.0 to 3.0 to make my ejb-jar EJB 3 compatible? Please help!

[Christophe Verré]

I don't think there is any DTD for EBJ3. I think you'll have to replace the old DOCTYPE with the new Schema format.

[Joe Harry]

Where can I find an example of the XML schema for EJB 3?

[Christophe Verré]

You mean a real example ? Sorry, I don't know.

By the way, the declaration you've posted above is a bit different from the official one :

<ejb-jar xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
<a href="http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd"" target="_blank" rel="nofollow">http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd"</a>
version="3.0">
...
</ejb-jar>

[Jaikiran Pai]

Originally posted by Jothi Shankar Kumar Sankararaj:
Where can I find an example of the XML schema for EJB 3?

I believe, you already know that in EJB3 the ejb-jar.xml is optional. As such, most of the examples available do not use the xml and instead illustrate the annotations usage.

[Joe Harry]

Originally posted by Jaikiran Pai:


I believe, you already know that in EJB3 the ejb-jar.xml is optional. As such, most of the examples available do not use the xml and instead illustrate the annotations usage.

I know but I want to make both EJB 3 and EJB 2.0 beans co exist and for this the simplest solution that I can assume is the one that is posted above (still make use of the ejb-jar.xml).

[Jaikiran Pai]

Originally posted by Jothi Shankar Kumar Sankararaj:
I know but I want to make both EJB 3 and EJB 2.0 beans co exist and for this the simplest solution that I can assume is the one that is posted above (still make use of the ejb-jar.xml).

Okay. This is possible. Here's an example from the JBoss documentation.

[Jeanne Boyarsky]

Or if you need the actual XML schema spec, Sun has it online