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Conflicting versions of datanucleus enhancer in a maven google app engine project

Asked 2009-05-18T14:11:15.143
20

I'm having a problem setting up datanucleus enhancer to use with a google app engine project. If I use the datanucleus eclipse plugin everything goes well, but in my maven project I get a strange conflicting version error.

My POM has these datanucleus references:

<dependency>
    <groupId>org.datanucleus</groupId>
    <artifactId>datanucleus-core</artifactId>
    <version>1.1.0</version>
</dependency>

...

<plugin>
    <groupId>org.datanucleus</groupId>
    <artifactId>maven-datanucleus-plugin</artifactId>
    <version>1.1.0</version>
    <configuration>
        <mappingIncludes>**/*.class</mappingIncludes>
        <verbose>true</verbose>
        <enhancerName>ASM</enhancerName>
        <api>JDO</api>
    </configuration>
    <executions>
        <execution>
        <phase>compile</phase>
        <goals>
            <goal>enhance</goal>
        </goals>
        </execution>
    </executions>
</plugin>

When I try to build the project I get the following error:

Exception in thread "main" Plugin (Bundle) "org.datanucleus" is already registered. 
Ensure you dont have multiple JAR versions of the same plugin in the classpath. The URL "file:/Users/drome/.m2/repository/org/datanucleus/datanucleus-core/1.1.0/**datanucleus-core-1.1.0.jar**" is already registered, and you are trying to register an identical plugin located at URL "file:/Users/drome/.m2/repository/org/datanucleus/datanucleus-core/1.1.3/**datanucleus-core-1.1.3.jar**."
org.datanucleus.exceptions.NucleusException: Plugin (Bundle) "org.datanucleus" is already registered. Ensure you dont have multiple JAR versions of the same plugin in the classpath. The URL "file:/Users/drome/.m2/repository/org/datanucleus/datanucleus-core/1.1.0/datanucleus-core-
google-app-engine maven-2 datanucleus
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2

I ran into the same issue while testing a maven gae plugin archetype.

I fixed it by adding exclusions in my gae runtime transitive dependencies

<!-- Google App Engine meta-package -->
        <dependency>
            <groupId>net.kindleit</groupId>
            <artifactId>gae-runtime</artifactId>
            <version>${gae.version}</version>
            <type>pom</type>
            <exclusions>
                <exclusion>
                    <groupId>com.google.appengine.orm</groupId>
                    <artifactId>datanucleus-core</artifactId>
                </exclusion>

            </exclusions>
        </dependency>

and then adding the nucleus core as a runtime dependency

<dependency>
            <groupId>org.datanucleus</groupId>
            <artifactId>datanucleus-core</artifactId>
            <version>${datanucleus-core.version}</version>
            <scope>runtime</scope>
            <exclusions>
                <exclusion>
                    <groupId>javax.transaction</groupId>
                    <artifactId>transaction-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

as keeping the gae plugin section simple:

<plugin>
                <groupId>org.datanucleus</groupId>
                <artifactId>maven-datanucleus-plugin</artifactId>
                <version>${maven-datanucleus-plugin.version}</version>
                <configuration>
                    <!--
                        Make sure this path contains your persistent classes!
                    -->
                    <mappingIncludes>**/model/*.class</mappingIncludes>
answered 2010-11-19T16:19:23.647

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