jodd-bean/src/main/java/jodd/introspector/PropertyDescriptor.java
public Class resolveKeyType(final boolean declared) {
		Class keyType = null;

		Getter getter = getGetter(declared);

		if (getter != null) {
			keyType = getter.getGetterRawKeyComponentType();
		}

		if (keyType == null) {
			FieldDescriptor fieldDescriptor = getFieldDescriptor();

			if (fieldDescriptor != null) {
				keyType = fieldDescriptor.getRawKeyComponentType();
			}
		}

		return keyType;
	}
public Class resolveKeyType(final boolean declared) {
		Class keyType = null;

		Getter getter = getGetter(declared);

		if (getter != null) {
			keyType = getter.getGetterRawKeyComponentType();
		}

		if (keyType == null) {
			FieldDescriptor fieldDescriptor = getFieldDescriptor();

			if (fieldDescriptor != null) {
				keyType = fieldDescriptor.getRawKeyComponentType();
			}
		}

		return keyType;
	}
Resolves key type for given property descriptor.