jaxb unmarshalling creates duplicate list of objects : How to unmarshall objects in lists? -

jaxb unmarshalling creates duplicate list of objects : how unmarshall objects in lists?

xml file , code shown below while unmarshalling reading elements getting duplicate list using jaxb annotations , final out put duplicate list

<data_reading>      <load_survey>         <interval_settings value="30" xunit="mins" />         <measurement name="energy_real" xunit="kwh" />         <reading interval="00" value="000.010" />         <reading interval="01" value="000.000" />         <reading interval="02" value="000.050" />         <reading interval="03" value="000.080" />         <reading interval="04" value="000.010" />      </load_survey> </data_reading>   these classes @xmlaccessortype(xmlaccesstype.field) public class loadsurvey {      @xmlelement(name="interval_settings")     private intervalsettings interval_settings;     @xmlelement(name="measurement")     private measurement measurement;     @xmlelement(name="reading", type = reading.class)     private list<reading> readings; //setter , getters }   @xmlrootelement(name="data_reading") @xmlaccessortype(xmlaccesstype.field) public class datareading {       @xmlelement(name="load_survey")     private loadsurvey load_survey;  }  code here getting following output  [data_reading [load_survey=loadsurvey [interval_settings=intervalsettings [value=30, xunit=mins], measurement=measurement [name=energy_real, xunit=kwh], readings=[reading [interval=00, value=0.23], reading [interval=01, value=0.23], reading [interval=02, value=0.22], reading [interval=03, value=0.21], reading [interval=04, value=0.23], reading [interval=05, value=0.24], reading [interval=00, value=0.23], reading [interval=01, value=0.23], reading [interval=02, value=0.22], reading [interval=03, value=0.21], reading [interval=04, value=0.23], reading [interval=05, value=0.24]]]]  getting readings list duplicates jaxb please provide solution 

the way getting duplicate items in list if have mapped both field (instance) variable , corresponding property (get/set method). since have specified xmlaccesstype.field make sure have not annotated get method list property.

for more information

• http://blog.bdoughan.com/2010/09/jaxb-collection-properties.html
• http://blog.bdoughan.com/2011/06/using-jaxbs-xmlaccessortype-to.html

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your example worked fine me. have included did below:

java model

below partial model focusing on part observed problem.

datareading

import javax.xml.bind.annotation.*;  @xmlrootelement(name="data_reading") @xmlaccessortype(xmlaccesstype.field) public class datareading {      @xmlelement(name="load_survey")     private loadsurvey load_survey;  } 

loadsurvey

import java.util.list; import javax.xml.bind.annotation.*;  @xmlaccessortype(xmlaccesstype.field) public class loadsurvey {      @xmlelement(name="reading")     private list<reading> readings;  } 

reading

import javax.xml.bind.annotation.*;  @xmlaccessortype(xmlaccesstype.field) public class reading {      @xmlattribute     private string interval;      @xmlattribute     private string value;  } 

demo code

demo

import java.io.file; import javax.xml.bind.*;  public class demo {      public static void main(string[] args) throws exception {         jaxbcontext jc = jaxbcontext.newinstance(datareading.class);          unmarshaller unmarshaller = jc.createunmarshaller();         file xml = new file("src/forum15833602/input.xml");         datareading datareading = (datareading) unmarshaller.unmarshal(xml);          marshaller marshaller = jc.createmarshaller();         marshaller.setproperty(marshaller.jaxb_formatted_output, true);         marshaller.marshal(datareading, system.out);     }  } 

input.xml/output

<?xml version="1.0" encoding="utf-8" standalone="yes"?> <data_reading>     <load_survey>         <reading interval="00" value="000.010"/>         <reading interval="01" value="000.000"/>         <reading interval="02" value="000.050"/>         <reading interval="03" value="000.080"/>         <reading interval="04" value="000.010"/>     </load_survey> </data_reading>