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Nevertheless is recommended to deploy again Syncope (upgraded) project without core-upgrader dependenciesdependency and modified persistenceContext.xml, in fact if container is started with "enabled" core-upgrader, some exceptionsexceptions will be noticed due to failure of upgrade task; but despite this few exceptions (after restart) no persistent changes are made to Syncope 1.2.X and it remains in a solid and working state.

Therefore following steps are optional (but recommended):

Stop the JEE container and follow steps below steps.

Disable ContentUpgrader

In core/src/main/resources/persistenceContext.xml remove last import:

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