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https://issues.apache.org/jira/browse/KARAF-4615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15417420#comment-15417420
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Christian Schneider commented on KARAF-4615:
--------------------------------------------
If you get hold of the new enterprise feature then this should work. I hope it
is deployed as a snapshot.
If not you need to check out the 4.0.x branch and build using mvn clean install
-Pfastinstall.
Then you can unpack the karaf distro and run it.
> Cannot get OpenJPA 2.4.1 to work due to JPA 2.1 being installed
> ---------------------------------------------------------------
>
> Key: KARAF-4615
> URL: https://issues.apache.org/jira/browse/KARAF-4615
> Project: Karaf
> Issue Type: Bug
> Components: karaf-feature
> Affects Versions: 4.0.5
> Reporter: Bengt Rodehav
> Assignee: Christian Schneider
> Fix For: 4.1.0, 4.0.6
>
>
> In order to use OpenJPA 2.4.1 both the "openjpa" (2.4.1) feature and the
> "jpa" (2.3.0) features need to be installed.
> However, OpenJPA needs JPA 2.0 - it does not work with JPA 2.1. But when
> installing the "jpa" (2.3.0) feature, JPA 2.1 is being installed.
> This has been discussed on the Karaf user list under the subject "Migrating
> from Karaf 2.4.1 to 4.0.5, JPA problems".
> I have, as a workaround, modified the enterprise-4.0.5-features.xml, feature
> "jpa" (2.3.0), as follows:
> * I have changed the version range for the peristence-api feature from
> [2.0.0,2.2.0) to [2.0.0,2.1.0). This disqualifies JPA 2.1 and instead cause
> JPA 2.0 to be installed.
> * The JPA 2.1 bundle seemed to be providing the package org.osgi.service.jpa
> which is mandatory. I therefore added the following dependency:
> ** <bundle dependency="true">mvn:org.osgi/org.osgi.service.jpa/1.0.0</bundle>
> So my modified "jpa" (2.3.0) feature now looks like this:
> <feature name="jpa" description="OSGi Persistence Container" version="2.3.0">
> <details>JPA implementation provided by Apache Aries JPA 2.x. NB: this
> feature doesn't provide the JPA engine, you have to install one by yourself
> (OpenJPA for instance)</details>
> <feature version="[1.1,2)" prerequisite="false"
> dependency="false">transaction-api</feature>
> <bundle dependency="true">mvn:org.osgi/org.osgi.service.jpa/1.0.0</bundle>
> <feature version="[2.0.0,2.1.0)" prerequisite="false"
> dependency="false">persistence-api</feature>
> <bundle
> dependency="true">mvn:org.apache.felix/org.apache.felix.coordinator/1.0.2</bundle>
> <bundle
> dependency="true">mvn:org.osgi/org.osgi.service.jdbc/1.0.0</bundle>
> <bundle>mvn:org.apache.aries.jpa/org.apache.aries.jpa.api/2.3.0</bundle>
>
> <bundle>mvn:org.apache.aries.jpa/org.apache.aries.jpa.container/2.3.0</bundle>
>
> <bundle>mvn:org.apache.aries.jpa/org.apache.aries.jpa.support/2.3.0</bundle>
> <conditional>
> <condition>aries-blueprint</condition>
>
> <bundle>mvn:org.apache.aries.jpa/org.apache.aries.jpa.blueprint/2.3.0</bundle>
> </conditional>
> </feature>
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