javajdodatanucleus

Datanucleus, JDO and executable jar - how to do it?


I am developing a desktop app with Datanucleus and JDO for embedded H2 database. It all works fine when I run it from Eclipse, but it stops working when I try to make executable jar out of it. I get a following error:

org.datanucleus.exceptions.NucleusUserException: Persistence process has been specified to use a ClassLoaderResolver of name "jdo" yet this has not been found by the DataNucleus plugin mechanism. Please check your CLASSPATH and plugin specification.

Of course it shows that I have not configured something properly - what am I missing? If I was missing something big, it wouldn't work at all, so I am assuming it's a flawed executable jar. I have seen that error in other apps, like JPOX, where it was fixed, but without any solution given.

Whole error stacktrace:

Exception in thread "main" javax.jdo.JDOFatalInternalException: Unexpected exception caught.
        at javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:1193)
        at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:808)
        at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:701)
        at db.PersistenceManagerFilter.init(PersistenceManagerFilter.java:44)
        at Main.main(Main.java:26)
NestedThrowablesStackTrace:
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at javax.jdo.JDOHelper$16.run(JDOHelper.java:1965)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.jdo.JDOHelper.invoke(JDOHelper.java:1960)
        at javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:1166)
        at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:808)
        at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:701)
        at db.PersistenceManagerFilter.init(PersistenceManagerFilter.java:44)
        at Main.main(Main.java:26)
Caused by: org.datanucleus.exceptions.NucleusUserException: Persistence process has been specified to use a ClassLoaderResolver of name "jdo" yet this has not been found by the DataNucleus plugin mechanism. Please check your CLASSPATH and plugin specification.
        at org.datanucleus.NucleusContext.<init>(NucleusContext.java:233)
        at org.datanucleus.NucleusContext.<init>(NucleusContext.java:196)
        at org.datanucleus.NucleusContext.<init>(NucleusContext.java:174)
        at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.<init>(JDOPersistenceManagerFactory.java:364)
        at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.createPersistenceManagerFactory(JDOPersistenceManagerFactory.java:294)
        at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.getPersistenceManagerFactory(JDOPersistenceManagerFactory.java:195)
        ... 12 more

The line it points to is PersistenceManagerFilter init method:

pmf = JDOHelper.getPersistenceManagerFactory(getProperties());

Properties file looks like that:

    javax.jdo.PersistenceManagerFactoryClass=org.datanucleus.api.jdo.JDOPersistenceManagerFactory
datanucleus.ConnectionDriverName=org.h2.Driver
datanucleus.ConnectionURL=jdbc:h2:datanucleus
datanucleus.ConnectionUserName=sa
datanucleus.ConnectionPassword=

I have all dependencies from maven, with a goal to deploy with dependencies. Dependencies are as stated on datanucleus page http://www.datanucleus.org/products/datanucleus/jdo/maven.html

Any ideas?


Solution

  • Adding to DataNucleus answer.
    To acheave what you need you should use maven-dependency-plugin
    and add following to your pom.xml

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>2.4</version>
                <executions>
                    <execution>
                        <id>copy-dependencies</id>
                        <phase>package</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${project.build.directory}/jars</outputDirectory>
                            <overWriteReleases>false</overWriteReleases>
                            <overWriteSnapshots>false</overWriteSnapshots>
                            <overWriteIfNewer>true</overWriteIfNewer>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
    

    Then the dependencies will be in target/jars dir.

    To execute your app you use command:

    Windows:
    java -cp "yourFile.jar;jars/*" package.className

    Linux:
    java -cp "yourFile.jar:jars/*" package.className

    NOTE: do not use jars/*.jar, this will not work