[google-appengine] PersistentManagerFactory can not be created in Google App Engine application

[Chuck]

Hello All,

My Google App Engine application tries to create PersistentManagerFactory 
as follows

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

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

    public static PersistenceManagerFactory get() {     
        return pmfInstance;
    }
}

The application was compiled successfully in maven. During the execution 
time, I got the following exception

Caused by: javax.jdo.JDOFatalUserException: A property named 
javax.jdo.PersistenceManagerFactoryClass must be specified, or a jar file 
with a META-INF/services/javax.jdo.PersistenceManagerFactory entry must be 
in the classpath, or a property named javax.jdo.option.PersistenceUnitName 
must be specified. at javax.jdo.JDOHelper.getPersistenceManagerFactory(
JDOHelper.java:861 
<https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=20180716t105533&file=javax%2Fjdo%2FJDOHelper.java&line=861&logInsertId=5b4cdc6f000aef3003635631&logNanos=1531763823138102000&nestedLogIndex=7&project=jason-test-bm&folder&organizationId>)
 
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:1099 
<https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=20180716t105533&file=javax%2Fjdo%2FJDOHelper.java&line=1099&logInsertId=5b4cdc6f000aef3003635631&logNanos=1531763823138102000&nestedLogIndex=7&project=jason-test-bm&folder&organizationId>)
 
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:919 
<https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=20180716t105533&file=javax%2Fjdo%2FJDOHelper.java&line=919&logInsertId=5b4cdc6f000aef3003635631&logNanos=1531763823138102000&nestedLogIndex=7&project=jason-test-bm&folder&organizationId>
)

Is there a way to create a PersistentManagerFactory?  My code for creating 
PMF looks like this.


Thanks!
C



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