public ModelMBeanInfo getMBeanInfo(Object defaultManagedBean, Object customManagedBean, String objectName) throws JMException {

        if ((defaultManagedBean == null && customManagedBean == null) || objectName == null)
            return null;
        // skip proxy classes
        if (defaultManagedBean != null && Proxy.isProxyClass(defaultManagedBean.getClass())) {
            LOGGER.trace("Skip creating ModelMBeanInfo due proxy class {}", defaultManagedBean.getClass());
            return null;
        }

        // maps and lists to contain information about attributes and operations
        Map<String, ManagedAttributeInfo> attributes = new LinkedHashMap<>();
        Set<ManagedOperationInfo> operations = new LinkedHashSet<>();
        Set<ModelMBeanAttributeInfo> mBeanAttributes = new LinkedHashSet<>();
        Set<ModelMBeanOperationInfo> mBeanOperations = new LinkedHashSet<>();
        Set<ModelMBeanNotificationInfo> mBeanNotifications = new LinkedHashSet<>();

        // extract details from default managed bean
        if (defaultManagedBean != null) {
            extractAttributesAndOperations(defaultManagedBean.getClass(), attributes, operations);
            extractMbeanAttributes(defaultManagedBean, attributes, mBeanAttributes, mBeanOperations);
            extractMbeanOperations(defaultManagedBean, operations, mBeanOperations);
            extractMbeanNotifications(defaultManagedBean, mBeanNotifications);
        }

        // extract details from custom managed bean
        if (customManagedBean != null) {
            extractAttributesAndOperations(customManagedBean.getClass(), attributes, operations);
            extractMbeanAttributes(customManagedBean, attributes, mBeanAttributes, mBeanOperations);
            extractMbeanOperations(customManagedBean, operations, mBeanOperations);
            extractMbeanNotifications(customManagedBean, mBeanNotifications);
        }

        // create the ModelMBeanInfo
        String name = getName(customManagedBean != null ? customManagedBean : defaultManagedBean, objectName);
        String description = getDescription(customManagedBean != null ? customManagedBean : defaultManagedBean, objectName);
        ModelMBeanAttributeInfo[] arrayAttributes = mBeanAttributes.toArray(new ModelMBeanAttributeInfo[mBeanAttributes.size()]);
        ModelMBeanOperationInfo[] arrayOperations = mBeanOperations.toArray(new ModelMBeanOperationInfo[mBeanOperations.size()]);
        ModelMBeanNotificationInfo[] arrayNotifications = mBeanNotifications.toArray(new ModelMBeanNotificationInfo[mBeanNotifications.size()]);

        ModelMBeanInfo info = new ModelMBeanInfoSupport(name, description, arrayAttributes, null, arrayOperations, arrayNotifications);
        LOGGER.trace("Created ModelMBeanInfo {}", info);
        return info;
    }
@Test
    public void testNullInputs() throws JMException {

        // at least one of the first parameters should be not null
        assertThat(mbeanInfoAssembler.getMBeanInfo(null, null, "")).isNull();

        // mbean should be not null
        assertThat(mbeanInfoAssembler.getMBeanInfo(testMbean, testMbean, null)).isNull();

        // it should return something if at least one of the first parameters
        // are
        // not null
        NotManagedMBean notManagedMbean = new NotManagedMBean();
        assertThat(mbeanInfoAssembler.getMBeanInfo(null, notManagedMbean, "someName")).isNotNull();
        assertThat(mbeanInfoAssembler.getMBeanInfo(notManagedMbean, null, "someName")).isNotNull();

    }