Shade（重定位）传递依赖的一个版本，而不是另一个版本

Question

I've got a Maven project that contains two dependencies, A and B . Each of these depends transitively on C , but they depend on different versions of C . Let's say that A depends on C version 1, and B depends on C version 2.

Unfortunately, A is not bytecode-compatible with version 2, nor B with version 1. (As it happens, A is source-compatible with version 2, but I don't think that will help us here.)

This means that I need both versions of the transitive dependency in my project, and I need A to use version 1, and B to use version 2.

Is there a way of doing this?

I had assumed that I would need to use the shade plugin to relocate the package name of A and all its dependencies, but this doesn't seem to be possible. If I shade A , its dependencies don't get shaded, and it still picks up version 2, and fails to run.

Answer 1

Create another project wrapper A named A-wrapper . Relocate C in A-wrapper . Then in your main project, depends on A-wrapper and B .

I've met a similar problem on pb2 and pb3 and it is resolved using this way. https://stackoverflow.com/a/41394239/1395722

Answer 2

Assuming dependency A requires v1 of C and dependency B requires v2 of C . You can create an uber jar of A containing v1 of C but changing the packaging using shade plugin, Example jar A has contents of C with new packaging "v1.c.something" . Do the same for B, so jar B has contents of C with new packaging "v2.c.something" . You need to include only the conflicting dependencies not all.