We have a project that has been migrated to Hibernate ORM 4.1.5.SP1 that is used in various clients. The problem is that we have a single client that is still using Websphere 6.1 (With no plans to update to a newer Websphere) and Hibernate is now being compiled with JDK 1.6 and that isn't compatible with Websphere 6.1 that is based on JDK 1.5. The only indication of this is HHH-5623 that states 'Drop support for JDK 1.5', so the Hibernate site Documentation/FAQ is lacking this information. We saw that for an early version people talking about JDK 1.4 and it was recommend they do a Hibernate src recompile using the JDK compatibility that they needed.

I tried doing the build but it seems various Hibernate classes implement Java Classes/Methods only available in JDK 1.6. Is there any workaround for this or are we going to have to maintain two versions of our product? One with Hibernate 3 and one with Hibernate 4.

Thanks in advance.