How can a JPA 1.0 project be converted to JPA 2.0?

Question

We've been using JPA 1.0 for some time now. We want to move ahead to JPA 2.0. How can this be done?

The person who decided to down-vote this has no idea that it is extremely hard to find at least a mailing list entry on this. Migration is a very common occurrance and migration between two standards, the latter being an upgrade of the former, is very common. I believe a reason to down-vote should've been given. — Ravindranath Akila, Nov 24 '12 at 19:18

score 4 · Answer 1 · answered Nov 24 '12 at 01:30

4

You could do worse than to read the migration guide from OpenJPA and then ask a more specific question.

answered Nov 24 '12 at 01:30

hd1

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@RavindranathAkila evidently not useful enough to be accepted though? – hd1 Nov 24 '12 at 03:20
I do prefer a more vendor independent link :-) – Ravindranath Akila Nov 24 '12 at 18:44
Then feel free to provide one :p – hd1 Nov 24 '12 at 18:48
:D ok ok, will look for one! :D – Ravindranath Akila Nov 24 '12 at 18:58
1

http://openjpa.apache.org/builds/2.0.0/apache-openjpa/docs/migration_considerations.html#jpa_2.0 ;-) – Ravindranath Akila Nov 24 '12 at 19:04
... and how exactly is OpenJPA **not** vendor independant? – hd1 Nov 24 '12 at 19:05
Actually, I couldn't find a proper link either. I feel my answer is adequate if one actually coded fully compliant to JPA 1.0. Just changing the persistence.xml entry would work, IMO. It worked in our case. – Ravindranath Akila Nov 24 '12 at 19:06
I read through the document, and most of the configuration required were OpenJPA specific. Vendor dependent correct? – Ravindranath Akila Nov 24 '12 at 19:07
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/20038/discussion-between-ravindranath-akila-and-hd1) – Ravindranath Akila Nov 24 '12 at 19:09
You said you "do prefer a more vendor independent link" and proceeded to provide one from apache's openjpa project. This seems to be more bickering, so I'll stop now – hd1 Nov 24 '12 at 19:10
You asked for a better link, and I found the original source of the link you provided, openjpa docs itself, and is more readable. – Ravindranath Akila Nov 24 '12 at 19:12

score 0 · Accepted Answer · answered Nov 24 '12 at 01:32

We changed the version name and xsd as the following:

<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
             version="2.0" xmlns="http://java.sun.com/xml/ns/persistence">

Which worked fine.

Please mention in comments if you think additional things need to be done and I will update this answer.

How can a JPA 1.0 project be converted to JPA 2.0?

2 Answers2