message: Java is required for android builds
diff: @@ -67,7 +67,7 @@ if(ANDROID)
  set(SAVE_JAVA_HOME $ENV{JAVA_HOME})
  set(ENV{JAVA_HOME} "")
  - find_package(Java)
  + find_package(Java REQUIRED)
  set(ENV{JAVA_HOME} ${SAVE_JAVA_HOME})
  if(${Java_VERSION} VERSION_LESS 1.8)
  