gk and Simon,

Thanks for you reply. 

After reading my own post again, I noticed I copied the wrong PMF code. I'm 
using this example (the mix up happened when I changed my code to the code 
above because I though the "pmfInstance == null"-check could be the problem 
:D)

import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManagerFactory;

public class PMF
{
private static PersistenceManagerFactory pmfInstance = null;
    private PMF() {}
    public static PersistenceManagerFactory getInstance()
    {
    if (pmfInstance == null)
    {
    pmfInstance = 
JDOHelper.getPersistenceManagerFactory("transactions-optional");
    }
        return pmfInstance;
    }
}

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