relocating classes in an imported jar

[Warren Turkal]

Hey everyone,

I am trying to deal with a project that uses two versions of a java maven package in different parts of the code. One of the jars is "shaded" under a different namespace using the following maven plugin:

https://maven.apache.org/plugins/maven-shade-plugin/

Here is the specific link with an example of relocating classes within a jar:

https://maven.apache.org/plugins/maven-shade-plugin/examples/class-relocation.html

I would like to be able to import a jar (e.g. kafka-client) and move it from it's original namespace (e.g. kafka.*) to some other namespace (e.g. new_pkg_name.kafka.*). Is it possible to do such a thing in bazel?

Thanks,

wt

[Han-Wen Nienhuys]

the link you describe says this works by moving around files in the
.jar and rewriting the byte code. If you have a command line utility
that does this, you could invoke it from a genrule.

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Han-Wen Nienhuys
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[Warren Turkal]

Jar Jar Links to the rescue:

https://code.google.com/p/jarjar/

I will probably try to write up some sky lark rules around this functionality. I'll prototype with jar jar links. I see that asm (the magic lib that jar jar uses) is already included in the third party libs in bazel. Maybe I'll see if I can integrate this functionality in a better way.

wt