Seeking Advice on Legacy Application Migration Strategy

Hello GWT Users Community,

I'm currently working on a large legacy application stack, using Java 8, Hibernate version 5.3.20.Final, and Hibernate Search 5.11.5.Final. Our frontend technology stack includes GWT version 2.8.2 and GXT version 2.3.1a-gwt22. Fontend and backend arent well de-coupled.

In my initial approach to modernize the application, I began by migrating Hibernate to version 6.2, assuming it would be the easiest step. However, I encountered an issue where Hibernate 6.2 requires transitioning to Jakarta Persistence. When attempting to compile parts of my codebase, I received the following error:

java.lang.UnsupportedClassVersionError: jakarta/persistence/Transient has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0

This suggests that I need to execute my code with JDK 11. However, when attempting to do so, I encountered the following issue:

[ERROR] Found resouce but unrecognized URL format: 'jrt:/java.sql/javax/sql/DataSource.class' java.lang.NoClassDefFoundError: javax/sql/DataSource

After reviewing your discussions in the GWT contributors group, I'm questioning whether starting with the Hibernate migration is the right approach. Should I instead prioritize migrating Java or perhaps GWT? I would greatly appreciate your insights and advice based on your experiences.

Thank you,

WM

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