geronimo-jaxrs_2.1_spec/src/main/java/javax/ws/rs/core/GenericType.java [96:138]:
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    static Type getTypeArgument(Class<?> clazz, Class<?> baseClass) {
        // collect superclasses
        Stack<Type> superclasses = new Stack<Type>();
        Type currentType;
        Class<?> currentClass = clazz;
        do {
            currentType = currentClass.getGenericSuperclass();
            superclasses.push(currentType);
            if (currentType instanceof Class) {
                currentClass = (Class) currentType;
            } else if (currentType instanceof ParameterizedType) {
                currentClass = (Class) ((ParameterizedType) currentType).getRawType();
            }
        } while (!currentClass.equals(baseClass));

        // find which one supplies type argument and return it
        TypeVariable tv = baseClass.getTypeParameters()[0];
        while (!superclasses.isEmpty()) {
            currentType = superclasses.pop();

            if (currentType instanceof ParameterizedType) {
                ParameterizedType pt = (ParameterizedType) currentType;
                Class<?> rawType = (Class) pt.getRawType();
                int argIndex = Arrays.asList(rawType.getTypeParameters()).indexOf(tv);
                if (argIndex > -1) {
                    Type typeArg = pt.getActualTypeArguments()[argIndex];
                    if (typeArg instanceof TypeVariable) {
                        // type argument is another type variable - look for the value of that
                        // variable in subclasses
                        tv = (TypeVariable) typeArg;
                        continue;
                    } else {
                        // found the value - return it
                        return typeArg;
                    }
                }
            }

            // needed type argument not supplied - break and throw exception
            break;
        }
        throw new IllegalArgumentException(currentType + " does not specify the type parameter T of GenericType<T>");
    }
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geronimo-jaxrs_2.0_spec/src/main/java/javax/ws/rs/core/GenericType.java [95:137]:
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    static Type getTypeArgument(Class<?> clazz, Class<?> baseClass) {

        Stack<Type> superclasses = new Stack<Type>();
        Type currentType;
        Class<?> currentClass = clazz;
        do {
            currentType = currentClass.getGenericSuperclass();
            superclasses.push(currentType);
            if (currentType instanceof Class) {
                currentClass = (Class) currentType;
            } else if (currentType instanceof ParameterizedType) {
                currentClass = (Class) ((ParameterizedType) currentType).getRawType();
            }
        } while (!currentClass.equals(baseClass));


        TypeVariable tv = baseClass.getTypeParameters()[0];
        while (!superclasses.isEmpty()) {
            currentType = superclasses.pop();

            if (currentType instanceof ParameterizedType) {
                ParameterizedType pt = (ParameterizedType) currentType;
                Class<?> rawType = (Class) pt.getRawType();
                int argIndex = Arrays.asList(rawType.getTypeParameters()).indexOf(tv);
                if (argIndex > -1) {
                    Type typeArg = pt.getActualTypeArguments()[argIndex];
                    if (typeArg instanceof TypeVariable) {


                        tv = (TypeVariable) typeArg;
                        continue;
                    } else {

                        return typeArg;
                    }
                }
            }


            break;
        }
        throw new IllegalArgumentException(currentType + " does not specify the type parameter T of GenericType<T>");
    }
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