Problem:
cache.getAdvancedCache().addInterceptorAfter(new ErrorInducingInterceptor(), NonTransactionalLockingInterceptor.class);
if NonTransactionalLockingInterceptor doesn't exist in the chain then the method return silently without informing the user that it didn't succeed. This is not API friendly.

Suggested solution: throw an exception to inform the user that his attempt is not correct.