fix: java output location moved to src/main

[campionfellin]

Signed-off-by: campionfellin campionfellin@gmail.com

Issue #, if available:

None, but related to comments on this PR:

cdk8s-team/cdk8s#233 (comment)

Description of changes:

Rather than putting imports into a deep folder structure with package name, they all fall under src/main. A cdk8s java project with multiple imports looks like:

imports/
  src/
    main/
      java/
        k8s/
        mattermost/
      resources/
        k8s/
        mattermost/

Note: using ncp because fs-extra doesn't have copy/merge functionality.

With fs.move option overwrite as true, you only get the last import in your list of imports. With overwrite false, it fails because imports/src/main/ already exists. We want to effectively merge the two imports into this folder. ncp seemed like the best option here for this.

Tested by yarn linking this with cdk8s and importing over there.

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