I solved the issue after adding dependency 
(datanucleus-api-jdo-3.0.0-m5.jar) and movong jdoconfig.xml to /META-INF/

But I encountered another issue.  

Caused by: javax.jdo.JDOUserException: You have either specified for this 
PMF to use a "persistence-unit" of "xxx" (yet this doesnt exist!) or you 
called JDOHelper.getPersistenceManagerFactory with "xxx" as the name of a 
properties file (and this doesnt exist in the CLASSPATH)

In jdoconfig.xml, what VALUE should be used for <property 
name="javax.jdo.option.PersistenceUnitName" value="xxx"/>?

Does anyone know?

Thanks

On Monday, July 23, 2018 at 7:27:22 AM UTC-7, George (Cloud Platform 
Support) wrote:
>
> If you are looking at the CLASSPATH at execution time, you get a different 
> value from System.getenv than, let's say, from a browser, your IDE or a 
> console. You may consider using a line such 
> as System.getProperty("java.class.path"); You should make sure that your 
> jar file with a META-INF/services/javax.jdo.PersistenceManagerFactory entry 
> is present in the CLASSPATH.
>
> It may be appropriate to remind you now that we mean to exchange general 
> opinions here, on trends and on issues of general nature touching the app 
> engine. For coding and programming architecture, you may be better served 
> in a forum such as stackoverflow, where experienced programmers are within 
> reach and ready to help. 
>

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