JNI Should I call DeleteLocalRef

In JNI, FindClass method returns a local reference.
Sample code:

 jclass arrayListClass = env->FindClass("java/util/ArrayList");
 ....
 env->DeleteLocalRef(arrayListClass);

Is it necessary to call DeleteLocalRef ? In fact, it is unnecessary to call DeleteLocalRef in most of the cases. However, JNI has a limited (but configurable) number of local references available. So, the best practice is to delete if the reference is created in a loop