AW: What the different between JDO and Entity Bean?

[Stefan Denninger]

Title: Converted by Scrooge for the Java(TM) platform 1.1

A very interesting topic.

Here is what i found at the JDO-page of SUN:

 

How will JDO affect the EJB technology?

JDO is a suitable implementation (1) for persistent helper classes for Session Beans, (2) as delegate classes for Bean Managed Persistence Entity Beans, and (3) for delegate classes for Container Managed Persistence Entity Beans

 

This is my oppinion:

Personally, i would feel a lot better about the EJB spec, if it would 'outsource' persistence, i.e. solving the problem of object-relational-mapping, to JDO. JDO could plug into the EJB-container in those cases where persistence is required.

The EJB-containers responsibility could be to trigger, control and monitor persistence instead of fully dealing with it.

Another benefit would be that the EJB-spec would migrate back to a paper with limited complexity.

For my taste, the spec focusses too much on persistence, i.e. object-relational-mapping (CMP only is about 30% of the entire spec) and still doesn't solve it in a way so that everybody is happy with it.

I am afraid, that other topics might suffer a bit from this, e.g. there could be a lot of enhancements done in the area of Message-Driven-Beans (which is only about 6% of the entire spec) or Scalability.

I think, the spec should fully concentrate on the issues of a server-side component model, like e.g.

- TX-Management

- Resource-Management

- Concurrency-Management

- *Controlling* Persistence by mediating (via the JDO API) between a component that requires persistence and a provider that offers a persistence-service

- Security

- Scalability

- Interoperability

These issues make the EJB-spec already complex and difficult enough. And these issues make EJB actually strong. My opinion is, that solving the problem of object-relational-mapping does not belong into the EJB-spec.

 

Looking forward to other peoples oppinion.

 

best regards

 

Stefan

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Von: A mailing list for Enterprise JavaBeans development [mailto:[EMAIL PROTECTED]]Im Auftrag von Eunum Listener
Gesendet: Freitag, 14. September 2001 06:05
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Betreff: What the different between JDO and Entity Bean?

Hi all

What is the difference between JDO and Entity Bean?
How to choose to adapt JDO or Entity Bean, when to use them?

thanks

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