Java EE (Java Enterprise Edition) General Discussion

I have json input as

{
  "data" :[
  {
  "keys": ["123","456","789"],

  "subkeys": [
   ["1", "2", "3"],
   ["1", "2", "3"],
   ["1", "2", "3"]
   ]
  }
  ]
}

I need to get this as List < List < String > > or List < String[] >.

@PUT @Path("/{key}/") 
@Consumes(MediaType.APPLICATION_JSON) 
@Produces(MediaType.APPLICATION_JSON) 
public MyResponse loadData( MonitoringDataRequest monReq) {  
}

@XmlRootElement(name="data")
public class MonitoringDataRequest {
    private List<MonitoringData> data;
   
    @XmlElement
    public void setData(List<MonitoringData> data) {
        this.data = data;
    }
    public List<MonitoringData> getData() {
        return data;
    }
    
}
@XmlRootElement(name="monitoring_data")
public class MonitoringData {
   private List<String> keys;
    private List<SubkeyData> subKeys;
    @XmlElement
    public void setKeys(List<String> keys) {
        this.keys = keys;
    }
    public List<String> getKeys() {
        return keys;
    }
    @XmlElement(name="subkeys")
    public void setSubKeys(List<SubkeyData> subKeys) {
        this.subKeys = subKeys;
    }
    public List<SubkeyData> getSubKeys() {
        return subKeys;
    }
}

@XmlRootElement(name="subkeys")
//@XmlAccessorType(XmlAccessType.NONE)
public class SubkeyData
{
  
    private List<String[]> subkeys;
    @XmlElement
    public void setSubkeys(List<String[]> subkeys)
    {
        this.subkeys = subkeys;
    }
    public List<String[]> getSubkeys()
    {
        return subkeys;
    }
}

I got the error like

Caused by: com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions java.util.List is an interface, and JAXB can't handle interfaces. this problem is related to the following location: at java.util.List at private java.util.List foobar.alkohol.register.webservice.jaxws.GetRelationsFromPersonResponse._return