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Home » Eclipse Projects » EclipseLink » Persistence.xml question(XML file contet problem)
Persistence.xml question [message #892287] Wed, 27 June 2012 15:31 Go to next message
Neil Cohen is currently offline Neil CohenFriend
Messages: 12
Registered: June 2012
Junior Member
I have just tried using EclipseLink in my environment. My development environment is Eclipse with the Vaadin development kit.

I have created a number of programs that run just fine - talk to my MySQL database both as standalone java applications and as web-based apps running under Tomcat.

The problem is that our production environment blocks outgoing requests on port 80.
And my persistence.xml file starts off like this:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
    xmlns="h ttp://" xmlns:xsi="h ttp://"
    xsi:schemaLocation="h ttp:// h ttp://">
    <persistence-unit name="My_Persistence_Unit"
etc. etc.

When my program runs - it will hang for about 90 minutes before the verification
request times out (for h t t p: / /

When I was using the Hibernate libraries previously, I was able to remove those
external requests - the persistence line looked like <persistence version="2.0">
and while Eclipse would complain about the content being wrong for the xml file,
it would compile (every other time, actually) and it would run. When I tried that with EclipseLink, the program fails as soon as I try to access the database. It produces an error that it can not find my PersistenceUnit. As soon as I put the lines back into persistence.xml, it works again...

Can someone tell me what the 'correct' solution for this problem would be? Is there some way I can tell the system to either not validate the schema, or to put some validation files locally and replace the external URLs?

I am an experienced Java programmer, but not so much on the database/persistence stuff. This is somewhat new to me, and I know almost nothing about EclipseLink yet.
Any information would be much appreciated, since I have to get these programs migrated as soon as possible to our new environment.

thanks in advance,


Re: Persistence.xml question [message #893523 is a reply to message #892287] Wed, 04 July 2012 12:55 Go to previous messageGo to next message
James Sutherland is currently offline James SutherlandFriend
Messages: 1939
Registered: July 2009
Location: Ottawa, Canada
Senior Member

Odd, I'm not sure why your XML parser would try to access the urls.

Try just giving the namespace and not the schema, this seems to work.

<persistence version="2.0" xmlns="">

James : Wiki : Book : Blog : Twitter
Re: Persistence.xml question [message #894010 is a reply to message #893523] Fri, 06 July 2012 11:46 Go to previous message
Neil Cohen is currently offline Neil CohenFriend
Messages: 12
Registered: June 2012
Junior Member
I found that 2 things did work.

1) Put a completely bogus URL in - the DNS lookup appears to fail and the system just continues on without checking

2) Copy the file from and store it locally. Change the URL to be file:///localhost/.... and the system appears to run correctly as well.

I did leave the namespace in place - that doesn't seem to have any effect or cause any problem...

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