TBR v.io/jni: Cache Java virtual machine only once.

Also report JNI initialization errors back into Java so that they become visible.

Change-Id: Ibefcb932b8fc6e575aa5574307b6e0a54f384c79
24 files changed
tree: f3f41da9e45712b4ff1f280bd37f0900cd120846
  1. core/
  2. test/
  3. util/
  4. v23/
  5. .gitignore
  6. dummy.go
  7. jni.go
  8. log_android.go