Embedded Jars and Java 17

I've been working on a project for a while (posted a related problem some time back) to convert our massively complex software from Java 8 to Java 17.

Almost everything is done, but a recurring problem, one that just reared its head again this morning, as to do with jar conflicts.  [I am so angry with the Java architects for "fixing" the version problem in such an intractable, unmanageable way...]

The problem occurs when another jar (in this case gwt-dev.jar) embeds other class files (in this case org.apache.commons.io) that are otherwise used in our software.

Some questions:

1) What version of commons-io is it within gwt-dev.jar?

2) Is it all of the classes, or only the classes needed/referenced by gwt-dev code?

3) Has anyone else had this problem and found a good solution?

Approaches I am going to try are:

1) Match our commons IO version to the one in gwt-dev (this bothers me, because there may be a lot of recoding on my end) and remove the commons-io jar from our classpath.

2) If that doesn't work, then also rebuild the gwt-dev jar without the commons-io (this won't work until I match our commons IO version to the one gwt-dev.jar embeds).

3) Beg you to solve this problem for me somehow.

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