Jackson Deserialize custom boolean json property -

i want deserialize boolean values in json. problem values can null, true, false, "true", false, "y" or "n".

i've created own boolean deserializer

public class custombooleandeserializer extends jsondeserializer<boolean> {      final protected class<?> _valueclass = boolean.class;      @override     public boolean deserialize(jsonparser jp, deserializationcontext ctxt) throws ioexception,             jsonprocessingexception {         return _parsebooleanprimitive2(jp, ctxt);     }      protected final boolean _parsebooleanprimitive2(jsonparser jp, deserializationcontext ctxt)             throws ioexception, jsonprocessingexception {         logutils.d("parse boolean");         jsontoken t = jp.getcurrenttoken();         if (t == jsontoken.value_true) {             return true;         }         if (t == jsontoken.value_false) {             return false;         }         if (t == jsontoken.value_null) {             return false;         }         if (t == jsontoken.value_number_int) {             return (jp.getintvalue() != 0);         }         if (t == jsontoken.value_string) {             string text = jp.gettext().trim();             if ("true".equals(text)) {                 return true;             }             if ("false".equals(text) || text.length() == 0) {                 return boolean.false;             }              if ("n".equalsignorecase(text) || text.length() == 0) {                 return boolean.false;             }              if ("y".equalsignorecase(text)) {                 return boolean.true;             }             throw ctxt.weirdstringexception(_valueclass, "only \"true\" or \"false\" recognized");         }         // otherwise, no can do:         throw ctxt.mappingexception(_valueclass);     } 

however, deserializer never called if register this:

version version = new version(1, 0, 0, "snapshot"); simplemodule module = new simplemodule("mymodulename", version); module = module.adddeserializer(new custombooleandeserializer()); objectmapper.registermodule(module); 

if, on other hand, use @jsondeserialize(using = custombooleandeserializer.class) boolean fields, called , works great. problem if property null, exception:

org.codehaus.jackson.map.jsonmappingexception: problem deserializing property 'show_query_cond' (expected type: [simple type, class boolean]; actual type: [null]), problem: invalid value field (through reference chain: com.csf.model.cstable["show_query_cond"])

so, if boolean property null, deserializer doesn't chance run. also, tried using mapper.configure(deserializationconfig.feature.fail_on_null_for_primitives, false); exception still thrown if use @jsondeserialize annotation.

does know how make work?

as registration, due java having both primitive boolean , object wrapper boolean. need registed using both java.lang.boolean , boolean.type -- latter placeholder class primitive type.

null handling different issue: deserialization method not called them. however, there method

jsondeserializer.getnullvalue() 

that should called; , primitives must return 'boolean.false', since can not assign null primitive value (it ok return wrapped; gets handled).