POLICIES.md: xjava -> java

POLICIES.md

 
 > Most (all?) exercises should be implemented in the form of instance methods since they contain "domain logic" and we (Exercism) want to encourage exemplary software.
 
-References: [[1](https://github.com/exercism/xjava/issues/177#issuecomment-261291741)]
+References: [[1](https://github.com/exercism/java/issues/177#issuecomment-261291741)]
 
 ### Starter implementations
 
     `throw new UnsupportedOperationException("Delete this statement and provide your own implementation.");`
 > - Exercises 21+: provide no stubs, but mention any "interesting" interface aspects in the HINT.md file (which gets merged into the README.md for the exercise).
 
-References: [[1](https://github.com/exercism/xjava/issues/178)]
+References: [[1](https://github.com/exercism/java/issues/178)]
 
 ### Do not make user-facing classes `final`
 
 
 > All but the first test in an exercise test suite should be annotated `@Ignore("Remove to run test")` (single test) or `@Ignore("Remove to run tests")` (parametrized test).
 
-References: [[1](https://github.com/exercism/xjava/issues/101#issuecomment-249349204)]
+References: [[1](https://github.com/exercism/java/issues/101#issuecomment-249349204)]
 
 ### Multiple file submissions
 
 > The first exercise in the track whose test suite mandates multiple solution files should be accompanied by a HINT.md file reminding the practitioner that the CLI supports multiple file submissions.
 
-References: [[1](https://github.com/exercism/xjava/issues/365#issuecomment-292533120)]
+References: [[1](https://github.com/exercism/java/issues/365#issuecomment-292533120)]
 
 ### Good first patches
 
-> Aim to keep 10-20 small and straightforward issues open at eny given time. Identify any such issues by applying the "Good first patch" label. You can view the current list of these issues [here](https://github.com/exercism/xjava/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+patch%22).
+> Aim to keep 10-20 small and straightforward issues open at eny given time. Identify any such issues by applying the "Good first patch" label. You can view the current list of these issues [here](https://github.com/exercism/java/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+patch%22).
 
-References: [[1](https://github.com/exercism/xjava/issues/220#issue-196447088)]
+References: [[1](https://github.com/exercism/java/issues/220#issue-196447088)]
 
 ### Simple onboarding
 
 > The Installing Java instructions should seek to minimize the number of steps and the number of concepts a new-to-the-track practitioner needs to learn to get to coding.
 
-References: [[1](https://github.com/exercism/xjava/issues/395#issue-215734887)]
+References: [[1](https://github.com/exercism/java/issues/395#issue-215734887)]