java - org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: Specified map is empty -
i find question related problem, there no answer it. here link
i using spring-mvc catch json serialization.
the stack trace follows:
org.springframework.http.converter.httpmessagenotwritableexception: not write json: specified map empty (through reference chain: com.captain.common.core.base.ajaxpackvo["volist"]->java.util.arraylist[0]); nested exception com.fasterxml.jackson.databind.jsonmappingexception: specified map empty (through reference chain: com.captain.common.core.base.ajaxpackvo["volist"]->java.util.arraylist[0]) @ org.springframework.http.converter.json.mappingjackson2httpmessageconverter.writeinternal(mappingjackson2httpmessageconverter.java:207) @ org.springframework.http.converter.abstracthttpmessageconverter.write(abstracthttpmessageconverter.java:180) @ org.springframework.web.servlet.mvc.method.annotation.abstractmessageconvertermethodprocessor.writewithmessageconverters(abstractmessageconvertermethodprocessor.java:143) @ org.springframework.web.servlet.mvc.method.annotation.abstractmessageconvertermethodprocessor.writewithmessageconverters(abstractmessageconvertermethodprocessor.java:89) @ org.springframework.web.servlet.mvc.method.annotation.requestresponsebodymethodprocessor.handlereturnvalue(requestresponsebodymethodprocessor.java:189) @ org.springframework.web.method.support.handlermethodreturnvaluehandlercomposite.handlereturnvalue(handlermethodreturnvaluehandlercomposite.java:69) @ org.springframework.web.servlet.mvc.method.annotation.servletinvocablehandlermethod.invokeandhandle(servletinvocablehandlermethod.java:122) @ org.springframework.web.servlet.mvc.method.annotation.requestmappinghandleradapter.invokehandlemethod(requestmappinghandleradapter.java:745) @ org.springframework.web.servlet.mvc.method.annotation.requestmappinghandleradapter.handleinternal(requestmappinghandleradapter.java:685) @ org.springframework.web.servlet.mvc.method.abstracthandlermethodadapter.handle(abstracthandlermethodadapter.java:80) @ org.springframework.web.servlet.dispatcherservlet.dodispatch(dispatcherservlet.java:919) @ org.springframework.web.servlet.dispatcherservlet.doservice(dispatcherservlet.java:851) @ org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:953) @ org.springframework.web.servlet.frameworkservlet.doget(frameworkservlet.java:844) @ javax.servlet.http.httpservlet.service(httpservlet.java:621) @ org.springframework.web.servlet.frameworkservlet.service(frameworkservlet.java:829) @ javax.servlet.http.httpservlet.service(httpservlet.java:728) @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:305) @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:210) @ org.apache.tomcat.websocket.server.wsfilter.dofilter(wsfilter.java:51) @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:243) @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:210) @ com.opensymphony.sitemesh.webapp.sitemeshfilter.dofilter(sitemeshfilter.java:65) @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:243) @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:210) @ com.captain.controller.core.htmlescaperfilter.dofilter(htmlescaperfilter.java:18) @ org.springframework.web.filter.delegatingfilterproxy.invokedelegate(delegatingfilterproxy.java:343) @ org.springframework.web.filter.delegatingfilterproxy.dofilter(delegatingfilterproxy.java:260) @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:243) @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:210) @ org.apache.shiro.web.servlet.proxiedfilterchain.dofilter(proxiedfilterchain.java:61) @ org.apache.shiro.web.servlet.advicefilter.executechain(advicefilter.java:108) @ org.apache.shiro.web.servlet.advicefilter.dofilterinternal(advicefilter.java:137) @ org.apache.shiro.web.servlet.onceperrequestfilter.dofilter(onceperrequestfilter.java:125) @ org.apache.shiro.web.servlet.proxiedfilterchain.dofilter(proxiedfilterchain.java:66) @ org.apache.shiro.web.servlet.abstractshirofilter.executechain(abstractshirofilter.java:449) @ org.apache.shiro.web.servlet.abstractshirofilter$1.call(abstractshirofilter.java:365) @ org.apache.shiro.subject.support.subjectcallable.docall(subjectcallable.java:90) @ org.apache.shiro.subject.support.subjectcallable.call(subjectcallable.java:83) @ org.apache.shiro.subject.support.delegatingsubject.execute(delegatingsubject.java:383) @ org.apache.shiro.web.servlet.abstractshirofilter.dofilterinternal(abstractshirofilter.java:362) @ org.apache.shiro.web.servlet.onceperrequestfilter.dofilter(onceperrequestfilter.java:125) @ org.springframework.web.filter.delegatingfilterproxy.invokedelegate(delegatingfilterproxy.java:343) @ org.springframework.web.filter.delegatingfilterproxy.dofilter(delegatingfilterproxy.java:260) @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:243) @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:210) @ org.springframework.web.filter.characterencodingfilter.dofilterinternal(characterencodingfilter.java:88) @ org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:106) @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:243) @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:210) @ org.apache.catalina.core.standardwrappervalve.invoke(standardwrappervalve.java:222) @ org.apache.catalina.core.standardcontextvalve.invoke(standardcontextvalve.java:123) @ org.apache.catalina.authenticator.authenticatorbase.invoke(authenticatorbase.java:502) @ org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:171) @ org.apache.catalina.valves.errorreportvalve.invoke(errorreportvalve.java:100) @ org.apache.catalina.valves.accesslogvalve.invoke(accesslogvalve.java:953) @ org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:118) @ org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:408) @ org.apache.coyote.http11.abstracthttp11processor.process(abstracthttp11processor.java:1041) @ org.apache.coyote.abstractprotocol$abstractconnectionhandler.process(abstractprotocol.java:603) @ org.apache.tomcat.util.net.jioendpoint$socketprocessor.run(jioendpoint.java:312) @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1110) @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:603) @ java.lang.thread.run(thread.java:722) caused by: com.fasterxml.jackson.databind.jsonmappingexception: specified map empty (through reference chain: com.captain.common.core.base.ajaxpackvo["volist"]->java.util.arraylist[0]) @ com.fasterxml.jackson.databind.serializerprovider._createandcacheuntypedserializer(serializerprovider.java:1061) @ com.fasterxml.jackson.databind.serializerprovider.findvalueserializer(serializerprovider.java:487) @ com.fasterxml.jackson.databind.ser.std.beanserializerbase.resolve(beanserializerbase.java:315) @ com.fasterxml.jackson.databind.ser.serializercache.addandresolvenontypedserializer(serializercache.java:148) @ com.fasterxml.jackson.databind.serializerprovider._createandcacheuntypedserializer(serializerprovider.java:1046) @ com.fasterxml.jackson.databind.serializerprovider.findvalueserializer(serializerprovider.java:445) @ com.fasterxml.jackson.databind.ser.impl.propertyserializermap.findandaddsecondaryserializer(propertyserializermap.java:95) @ com.fasterxml.jackson.databind.ser.std.asarrayserializerbase._findandadddynamic(asarrayserializerbase.java:268) @ com.fasterxml.jackson.databind.ser.impl.indexedlistserializer.serializecontents(indexedlistserializer.java:96) @ com.fasterxml.jackson.databind.ser.impl.indexedlistserializer.serializecontents(indexedlistserializer.java:21) @ com.fasterxml.jackson.databind.ser.std.asarrayserializerbase.serialize(asarrayserializerbase.java:183) @ com.fasterxml.jackson.databind.ser.beanpropertywriter.serializeasfield(beanpropertywriter.java:505) @ com.fasterxml.jackson.databind.ser.std.beanserializerbase.serializefields(beanserializerbase.java:639) @ com.fasterxml.jackson.databind.ser.beanserializer.serialize(beanserializer.java:152) @ com.fasterxml.jackson.databind.ser.defaultserializerprovider.serializevalue(defaultserializerprovider.java:114) @ com.fasterxml.jackson.databind.objectmapper.writevalue(objectmapper.java:1887) @ org.springframework.http.converter.json.mappingjackson2httpmessageconverter.writeinternal(mappingjackson2httpmessageconverter.java:204) ... 63 more caused by: java.lang.illegalargumentexception: specified map empty @ java.util.enummap.<init>(enummap.java:176) @ com.fasterxml.jackson.databind.util.enumvalues.<init>(enumvalues.java:26) @ com.fasterxml.jackson.databind.util.enumvalues.constructfromname(enumvalues.java:50) @ com.fasterxml.jackson.databind.util.enumvalues.construct(enumvalues.java:33) @ com.fasterxml.jackson.databind.ser.std.enumserializer.construct(enumserializer.java:82) @ com.fasterxml.jackson.databind.ser.basicserializerfactory.buildenumserializer(basicserializerfactory.java:838) @ com.fasterxml.jackson.databind.ser.basicserializerfactory.findserializerbyprimarytype(basicserializerfactory.java:402) @ com.fasterxml.jackson.databind.ser.beanserializerfactory._createserializer2(beanserializerfactory.java:217) @ com.fasterxml.jackson.databind.ser.beanserializerfactory.createserializer(beanserializerfactory.java:152) @ com.fasterxml.jackson.databind.serializerprovider._createuntypedserializer(serializerprovider.java:1077) @ com.fasterxml.jackson.databind.serializerprovider._createandcacheuntypedserializer(serializerprovider.java:1056) ... 79 more i sure "volist" has 1 object.
why "specified map empty" ?
does 1 see problem before ?
ok fault :-(. deal 1 'enum' attribute in 'volist' have not define element it. below:
public class usertype { } just other information...
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