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New to JPA [message #434520]

Wed, 18 July 2007 20:19

Glen Self

Messages: 7
Registered: July 2009

Junior Member

When trying to set up I get errors:
"The import java.persistence cannot be resolved"
which of course gives Entity cannot be resolved to a type etc.....
I can't find any jar that has this
Any ideas where to look?

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Re: New to JPA [message #434521 is a reply to message #434520]

Wed, 18 July 2007 22:12

Karen Butzke

Messages: 220
Registered: July 2009

Senior Member

You can download TopLink Essentials, which is the JPA reference
implementation:

http://www.oracle.com/technology/products/ias/toplink/jpa/do wnload.html

Or any other runtime implementation of JPA would include the annotation
definitions.

Karen

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Re: New to JPA [message #434523 is a reply to message #434521]

Fri, 20 July 2007 04:32

epson wang

Messages: 32
Registered: July 2009

Member

you can use hibernate too.

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Re: New to JPA [message #434524 is a reply to message #434523]

Fri, 20 July 2007 12:06

Glen Self

Messages: 7
Registered: July 2009

Junior Member

Installed top-link
Installed glassfish
Still the same - cannot import java.persistence
Where is it?

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Re: New to JPA [message #434525 is a reply to message #434524]

Fri, 20 July 2007 14:32

Karen Butzke

Messages: 220
Registered: July 2009

Senior Member

Now that you have glassfish persistence installed you will need to add the
toplink-essentials.jar to your eclipse project classpath.

When creating a new JPA project, we provide 2 options to help specify the
JPA implementation.

1. Use implementation provided by server runtime
2. Use implementation library - this includes links to set up a library
and a JPA preference for the default JPA implementation library. This
will just make it easier the next time you create a new JPA project.

Since you already have a project, you can set up a library that points to
the toplink-essentials.jar and add it to your project. Or you can just
add the jar directly ro your project if you don't want a library.

Karen

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Re: New to JPA [message #434526 is a reply to message #434525]

Fri, 20 July 2007 19:36

Glen Self

Messages: 7
Registered: July 2009

Junior Member

I added toplink-essentials.jar to my project and got the same error
I opened the jar and found that it contained javax.persistance so I
changed the import and most of the errors went away.
Now I get "This mapped class is not contained in any persistence unit" on
the @Entity
that preceeds
public class Entities implements Serializable {....

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Re: New to JPA [message #434527 is a reply to message #434526]

Fri, 20 July 2007 20:30

Karen Butzke

Messages: 220
Registered: July 2009

Senior Member

Have you taken a look at the Dali tutorials and docs on our website?
http://www.eclipse.org/webtools/dali/docs/tutorial_1.0/dali_ jsf_tutorial.htm
You need a persistence.xml file and you need to specify your entities in a
persistence unit.

thanks,
Karen

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