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This will take longer than expected as I'm quite busy and it's a complex task to design a good API. Still planning on completing it however.

I believe #116 allows you to add `trim_trailing_whitespace` option not only in `.editorconfig` files but also in your amp configuration.

I fixed the working directory in a recent commit, it will feature in the next release. Other ideas are good, will see about them. I think number 1 might be...

Can you confirm `/usr/lib/jvm/java-8-openjdk/jre/lib/rt.jar` contains `java/lang/Object.class` ?

Name obfuscation requires changing visibility otherwise package private access would break. You should exclude your mixins from being name obfuscated.

Please post the entire stacktrace

It sounds like one of your libraries has invalid classes, we should have better handling for this when loading libraries

Read the readme

You need to add the rt to your classpath

Check the ReadMe, there is an example config with the rt added to the classpath