https://github.com/FasterXML/jackson-dataformat-xml: Data format extension for Jackson (http://jackson.codehaus.org) to offer alternative support for serializing POJOs as XML and deserializing XML as pojos. Support implemented on top of Stax API (javax.xml.stream), by implementing core Jackson Streaming API types like JsonGenerator, JsonParser and JsonFactory. Some data-binding types overridden as well (ObjectMapper sub-classed as XmlMapper). (FasterXML)
  • Tatu Saloranta
  • Christopher Currie
  • Paul Brown 
package com.fasterxml.jackson.dataformat.xml.util;

import java.util.Collection;

import com.fasterxml.jackson.databind.JavaType;

public class TypeUtil
{
    
Helper method used for figuring out if given raw type is a collection ("indexed") type;
in which case a wrapper element is typically added.

/**
     * Helper method used for figuring out if given raw type is a collection ("indexed") type;
     * in which case a wrapper element is typically added.
     */
    public static boolean isIndexedType(JavaType type)
    {
        if (type.isContainerType()) {
            Class<?> cls = type.getRawClass();
            // One special case; byte[] will be serialized as base64-encoded String, not real array, so:
            // (actually, ditto for char[]; thought to be a String)
            if (cls == byte[].class || cls == char[].class) {
                return false;
            }
            // Also, should not add wrapping for Maps
            // [dataformat-xml#220]: nor map-like (Scala Map) types
            if (type.isMapLikeType()) {
                return false;
            }
            return true;
        }
        return false;
    }    

    public static boolean isIndexedType(Class<?> cls)
    {
        return (cls.isArray() && cls != byte[].class && cls != char[].class)
                || Collection.class.isAssignableFrom(cls);
    }
}