com.fasterxml.jackson.databind.JsonMappingException no String-argument constructor/factory method to deserialize from String value ('1')

Question

I am calling the database stored procedure which returns the output as XML.

DB output

<ROWSET>
 <ROW>
  <EMPLOYEEID>1</EMPLOYEEID>
  <EMPLOYEENAME>SEAN</EMPLOYEENAME>
  <DEPT>ACOUNTING</DEPT>
 </ROW>
 <ROW>
  <EMPLOYEEID>6</EMPLOYEEID>
  <EMPLOYEENAME>KAREN</EMPLOYEENAME>
  <DEPT>HR</DEPT>
 </ROW>
</ROWSET>

I am using Jackson to convert XML String to java objects. I have created a supporting java class to map XML to java objects

@JacksonXmlRootElement(localName = "ROWSET")
public class RowSet {

    @JacksonXmlProperty(localName = "ROW")
    private Row [] row;

    public RowSet() {
    }

    public Row [] getRow() {
        return row;
    }

    public void setRow(Row [] row) {
        this.row = row;
    }
}

class Row {

    @JacksonXmlProperty(localName = "EMPLOYEEID")
    private String employeeId;
    @JacksonXmlProperty(localName = "EMPLOYEENAME")
    private String employeeName;
    @JacksonXmlProperty(localName = "DEPT")
    private String dept;

    public String getEmployeeId() {
        return employeeId;
    }

    public void setEmployeeId(String employeeId) {
        this.employeeId = employeeId;
    }

    public String getEmployeeName() {
        return employeeName;
    }

    public void setEmployeeName(String employeeName) {
        this.employeeName = employeeName;
    }

    public String getDept() {
        return dept;
    }

    public void setDept(String dept) {
        this.dept = dept;
    }
}

Code to create java object from string xml

public static void main(String ... args){
    String ouputput= getEmployeeData();// DB call to get data as xml string
    XmlMapper xmlMapper = new XmlMapper();
    RowSet rowSet= xmlMapper.readValue(ouputput, RowSet.class);
    System.out.println(rowSet.getRow().length);
}

I am getting the following exception

com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of com.org.employee.Row no String-argument constructor/factory method to deserialize from String value ('1')

Manos Nikolaidis · Accepted Answer · 2019-08-27 17:10:10Z

1

The Row array in XML is supposed to have a wrapper (apart from RowSet) that doesn't exist in you XML text. Tell Jackson to not look for a wrapper e.g.

@JacksonXmlProperty(localName = "ROW")
@JacksonXmlElementWrapper(useWrapping = false)
private Row[] row;

answered Aug 27, 2019 at 17:10

Manos Nikolaidis

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