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POjava.util.Map / HashMap JAXB to JSON with Jackson - com.fasterxml.jackson.databind.JsonMappingException: Failed to narrow content type
 

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    <p>while trying to de-serialize class with Map/HashMap property from json message annotated with JAXB annotations I am getting</p> <pre><code>com.fasterxml.jackson.databind.JsonMappingException: Failed to narrow content type [map type; class java.util.HashMap, [simple type, class java.lang.String] -&gt; [simple type, class blog.map.generated.Address]] with content-type annotation (blog.map.generated.Customer$AddressMap): Class blog.map.generated.Customer$AddressMap is not assignable to blog.map.generated.Address </code></pre> <p>My json message:</p> <pre><code>{"addressMap":{"shipping":{"street":"2 B Road"},"billing":{"street":"1 A Street"}}} </code></pre> <p>My JAXB annotated class:</p> <pre><code>@XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "customer", propOrder = { "addressMap" }) public class Customer { @XmlElement(required = true, type = Customer.AddressMap.class) protected HashMap&lt;String, Address&gt; addressMap; public HashMap&lt;String, Address&gt; getAddressMap() { return addressMap; } public void setAddressMap(HashMap&lt;String, Address&gt; value) { this.addressMap = value; } @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "", propOrder = { "entry" }) public static class AddressMap { protected List&lt;Customer.AddressMap.Entry&gt; entry; public List&lt;Customer.AddressMap.Entry&gt; getEntry() { if (entry == null) { entry = new ArrayList&lt;Customer.AddressMap.Entry&gt;(); } return this.entry; } @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "", propOrder = { "key", "value" }) public static class Entry { protected java.lang.String key; protected blog.map.generated.Address value; public java.lang.String getKey() { return key; } public void setKey(java.lang.String value) { this.key = value; } public blog.map.generated.Address getValue() { return value; } public void setValue(blog.map.generated.Address value) { this.value = value; } } } } </code></pre> <p>I tried to avoid this problem by creating custom XmlAdapter for HashMap property as follows:</p> <pre><code>public class MapAdapter extends XmlAdapter&lt;MapAdapter.AdaptedMap, Map&lt;String, Address&gt;&gt; { public static class AdaptedMap { public List&lt;Entry&gt; entry = new ArrayList&lt;Entry&gt;(); } public static class Entry { public String key; public Address value; } @Override public Map&lt;String, Address&gt; unmarshal(AdaptedMap adaptedMap) throws Exception { Map&lt;String, Address&gt; map = new HashMap&lt;String, Address&gt;(); for(Entry entry : adaptedMap.entry) { map.put(entry.key, entry.value); } return map; } @Override public AdaptedMap marshal(Map&lt;String, Address&gt; map) throws Exception { AdaptedMap adaptedMap = new AdaptedMap(); for(Map.Entry&lt;String, Address&gt; mapEntry : map.entrySet()) { Entry entry = new Entry(); entry.key = mapEntry.getKey(); entry.value = mapEntry.getValue(); adaptedMap.entry.add(entry); } return adaptedMap; } } </code></pre> <p>That works BUT creates DIFFERENT MESSAGE than I need to deserialize:</p> <pre><code>{"addressMap":{"entry":[{"key":"shipping","value":{"street":"2 B Road"}},{"key":"billing","value":{"street":"1 A Street"}}]}} </code></pre> <p>Which is somewhat logical as it was converted to List of key-value pairs.</p> <p>When I delete that "Map -> List of Key-Value pairs conversion" than IT WORKS!</p> <pre><code>@XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "customer", propOrder = { "addressMap" }) public class Customer { @XmlElement(required = true) protected HashMap&lt;String, Address&gt; addressMap; public HashMap&lt;String, Address&gt; getAddressMap() { return addressMap; } public void setAddressMap(HashMap&lt;String, Address&gt; value) { this.addressMap = value; } } </code></pre> <p>Does anybody know how to deal with such issue using Jackson 2.2.2 and JAXB? OR How to force XJC not to generate Map->List of KV pairs conversion?</p> <p>Thanks</p>
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