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Attributes matter on resolvable configurations and are not inherited. So what you need is to move the attribute definition to

compileClasspath

or similar. Once that’s fixed, you have a typo in the

transform()

method. Either use

inputArtifact

or

getInputArtifact()

but not the first with parens. After that,

Test.java

fails to compile as expected. And the classpath contains the transformed dependency.