Handle completely new files better

First, a file that only exists as a buffer, not even saved yet:
* Pick the first Java target found, it will probably work
* Complain if not found instead of silently pretend the file is valid

Second, a file that was added after the last gradle run so
cache doesn't contain it:
* If no fitting target was found, and the file exist and we used
  cached data, force a new gradle run

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