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Attempt to update to Java 8 + newer framework versions #1

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@martinschneider martinschneider commented Nov 24, 2019

I updated most libraries to newer versions. There are two blocking errors:

javax.jdo.JDOFatalInternalException: Class "com.google.appengine.datanucleus.DatastoreManager" was not found in the CLASSPATH
The class is in datanucleus-core-5.2.2.jar which is in WEB-INF/lib and should therefore be on the classpath. 😕

User-defined SCO wrapper class org.datanucleus.store.types.sco.simple.xxx was not found.
These classes have been moved to org.datanucleus.store.types.wrappers.xxx. The same goes for org.datanucleus.store.types.backed.xxx which are now at org.datanucleus.store.types.wrappers.backed.xxx. These are referenced in plugin.xml in datanucleus-appengine. This project is discontinued and built on Datanucleus 3.x 😢

Note:
Java 11 is a story for another day: https://cloud.google.com/appengine/docs/standard/java11/java-differences

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