ejb - Java XML, The number of formal and actual parameters differs, or an unwrapping conversion has failed -


when requesting data endpoint accept: application/xml keep getting following error:

javax.xml.bind.marshalexception - linked exception: [exception [eclipselink-27] (eclipse persistence services - 2.6.1.v20150916-55dc7c3): org.eclipse.persistence.exceptions.descriptorexception exception description: trying invoke method [getsurveyid] on object [com.on24.ejb.mapping.surveyquestion]. number of actual , formal parameters differs, or unwrapping conversion has failed. internal exception: java.lang.illegalargumentexception: object not instance of declaring class mapping: org.eclipse.persistence.oxm.mappings.xmldirectmapping[surveyid-->surveyid/text()] descriptor: xmldescriptor(com.on24.ejb.mapping.survey --> [databasetable(survey)])]

the response works fine when accept: application/json know can't problem extracting info db; haven't been able solve issue appreciated.

dtos involved: 

@xmlrootelement @xmltype (proporder={"surveyid", "surveyquestions"}) @xmlaccessortype(xmlaccesstype.public_member) public class survey {     private long surveyid;     private list<surveyquestion> surveyquestions;      public survey(){}      public long getsurveyid() {         return surveyid;     }      public void setsurveyid(long surveyid) {         this.surveyid = surveyid;     }      @xmlelementwrapper(name="surveyquestionslist")     @xmlelement(name="surveyquestion")     public list<surveyquestion> getsurveyquestions() {         return surveyquestions;     }      public void setsurveyquestions(list<surveyquestion> surveyquestions) {         this.surveyquestions = surveyquestions;     } }

and 

@xmlrootelement @xmltype (proporder={"surveyquestionid", "surveyquestion", "surveyanswers"}) @xmlaccessortype(xmlaccesstype.public_member) public class surveyquestion {     private long surveyquestionid;     private string surveyquestion;     private list<string> surveyanswers;       public surveyquestion(){}      public long getsurveyquestionid() {         return surveyquestionid;     }      public void setsurveyquestionid(long surveyquestionid) {         this.surveyquestionid = surveyquestionid;     }      public string getsurveyquestion() {         return surveyquestion;     }      public void setsurveyquestion(string surveyquestion) {         this.surveyquestion = surveyquestion;     }      @xmlelementwrapper(name="surveyanswerslist")     @xmlelement(name="surveyanswer")     public list<string> getsurveyanswers() {         return surveyanswers;     }      public void setsurveyanswers(list<string> surveyanswers) {         this.surveyanswers = surveyanswers;     } }

i've tried several thinks refactoring use xmlaccesstype.public_member, xmlaccesstype.field, xmlaccesstype.property no success there.

i'd understand why error generated. if more info need i'll add per asked for, thanks.


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