Migration from Weblogic server 12.2 to Payara server 5

I am new to Payara and trying to migrate my application which is deployed in weblogic server 12.2 with Java 7 to Payara 5. We could notice that since payara uses the latest java version, its not supporting Java.util.Date. What are the basic changes or issues that arises when we migrate to payara from weblogic server.


can you clarify whet you mean with

Do you have a problem using JPA or JAX-RS and can you indicate the error you see?