jodd-core/src/main/java/jodd/util/cl/DefaultClassLoaderStrategy.java
private static int getPrimitiveClassNameIndex(final String className) {
		int dotIndex = className.indexOf('.');
		if (dotIndex != -1) {
			return -1;
		}
		return Arrays.binarySearch(PRIMITIVE_TYPE_NAMES, className);
	}
private static int getPrimitiveClassNameIndex(final String className) {
		int dotIndex = className.indexOf('.');
		if (dotIndex != -1) {
			return -1;
		}
		return Arrays.binarySearch(PRIMITIVE_TYPE_NAMES, className);
	}
Detects if provided class name is a primitive type.
Returns >= 0 number if so.