void () { final String errorMessage = ".lookupStarted() was called " + depth + " times (>" + MAX_LOOKUP_DEPTH + " max) without matching " + ".close()/.lookupFinished() -> probably code bug?\n" + this; if (THROW_ON_INCORRECT_USAGE) { throw new AssertionError(errorMessage); } else { THROTTLED_LOG.warn(errorMessage); } }