Re: Seeking Advice on Legacy Application Migration Strategy

It'd be hard to answer that question, as we don't have all the details.  As this is a GWT forum, I'd say, migrate GWT to the latest version first.  But that might actually be bad advice, just depends on your project.

My gut feel is you'd be best to decouple the front end and back end first.

On Friday 26 April 2024 at 2:32:17 am UTC+10 Wejden Mrabti wrote:

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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