java - Where the registerModule code should live when using jackson -


this test code.

dynabean bean1 = new lazydynabean(); bean1.set("p1", 1); bean1.set("p2", 2); objectmapper mapper = new objectmapper(); try {     logger.error(mapper.writevalueasstring(bean1)); } catch (jsonprocessingexception ex) {     logger.catching(ex); } simplemodule simplemodule = new simplemodule("simplemodule", new version(1, 0, 0, null, "com.bolan", "oa")); simplemodule.addserializer(dynabean.class, new dynabeanserializer()); mapper.registermodule(simplemodule);  dynabean bean2 = new lazydynabean(); bean2.set("p1", 1); bean2.set("p2", 2); try {     logger.error(mapper.writevalueasstring(bean2)); } catch (jsonprocessingexception ex) {     logger.catching(ex); }

this source of dynabeanserializer:

public class dynabeanserializer extends jsonserializer<dynabean> {      private final static logger logger = logmanager.getlogger(dynabeanserializer.class);      @override     public void serialize(dynabean value, jsongenerator gen, serializerprovider serializers) throws ioexception, jsonprocessingexception {         logger.info("serializing byna bean!");         gen.writestartobject();         dynaproperty[] dynaproperties = value.getdynaclass().getdynaproperties();         (dynaproperty dynaproperty : dynaproperties) {             try {                 gen.writeobjectfield(dynaproperty.getname(), propertyutils.getproperty(value, dynaproperty.getname()));             } catch (illegalaccessexception | invocationtargetexception | nosuchmethodexception ex) {                 logger.error(ex);             }         }         gen.writeendobject();     }      @override     public class<dynabean> handledtype() {         logger.info("get jsonserializer type!");         return dynabean.class;     }  }

and output is:

10:18:09.794 [javafx application thread] error com.bolan.test.javafx.test.fxmlcontroller - {"dynaclass":{"dynabeanclass":"org.apache.commons.beanutils.lazydynabean","name":"org.apache.commons.beanutils.lazydynaclass","restricted":false,"returnnull":false,"dynaproperties":[{"name":"p1","type":"java.lang.integer","contenttype":null,"indexed":false,"mapped":false},{"name":"p2","type":"java.lang.integer","contenttype":null,"indexed":false,"mapped":false}]},"map":{"p2":2,"p1":1}} 10:18:09.797 [javafx application thread] error com.bolan.test.javafx.test.fxmlcontroller - {"dynaclass":{"dynabeanclass":"org.apache.commons.beanutils.lazydynabean","name":"org.apache.commons.beanutils.lazydynaclass","restricted":false,"returnnull":false,"dynaproperties":[{"name":"p1","type":"java.lang.integer","contenttype":null,"indexed":false,"mapped":false},{"name":"p2","type":"java.lang.integer","contenttype":null,"indexed":false,"mapped":false}]},"map":{"p2":2,"p1":1}}

however wish output this:

10:21:03.933 [javafx application thread] error com.bolan.test.javafx.test.fxmlcontroller - {"p1":1,"p2":2}

what's more, if edit test code following:

dynabean bean1 = new lazydynabean(); bean1.set("p1", 1); bean1.set("p2", 2); objectmapper mapper = new objectmapper(); simplemodule simplemodule = new simplemodule("simplemodule", new version(1, 0, 0, null, "com.bolan", "oa")); simplemodule.addserializer(dynabean.class, new dynabeanserializer()); mapper.registermodule(simplemodule);  dynabean bean2 = new lazydynabean(); bean2.set("p1", 1); bean2.set("p2", 2); try {     logger.error(mapper.writevalueasstring(bean2)); } catch (jsonprocessingexception ex) {     logger.catching(ex); }

the output wish~ it's very strange.

you must register modules going use before using objectmapper first time. registration after usage may or may not have effect; adding custom (de)serializers types have serialized/deserialized not have effect due caching of serializers , deserializers.


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