Should I use GitMergeBaseBuilder only in merge hook?

[Terry Hwang]

Should I use GitMergeBaseBuilder only in merge hook?

GitMergeBaseBuilder always return null when I use it in PreRepositoryHook. 

I created a pull-request Feature --> Master branch without luck.

final GitMergeBaseBuilder builder = builderFactory.builder(repository).mergeBase().between(commitInMaster.getId(), commitInFeature.getId());

final String sha = builder.build(new OutputHandler()).call();

 Many thanks,

Terry