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Spring - BeanWrapper, setting nested beans

[Last Updated: Jun 19, 2021]

Following examples shows how to set nested beans instances by using BeanWrapper.

Examples

Beans

package com.logicbig.example;

public class Department {
  private long deptCode;
  private String deptName;

  public long getDeptCode() {
      return deptCode;
  }

  public void setDeptCode(long deptCode) {
      this.deptCode = deptCode;
  }

  public String getDeptName() {
      return deptName;
  }

  public void setDeptName(String deptName) {
      this.deptName = deptName;
  }

  @Override
  public String toString() {
      return "Department{" +
              "deptCode='" + deptCode + '\'' +
              ", deptName='" + deptName + '\'' +
              '}';
  }
}
package com.logicbig.example;

public class Employee {
  private String name;
  private Department department;

  public String getName() {
      return name;
  }

  public void setName(String name) {
      this.name = name;
  }

  public Department getDepartment() {
      return department;
  }

  public void setDepartment(Department department) {
      this.department = department;
  }

  @Override
  public String toString() {
      return "Employee{" +
              "name='" + name + '\'' +
              ", department=" + department +
              '}';
  }
}

Setting nested bean

package com.logicbig.example;

import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

public class BeanWrapperNestedBean {
    public static void main (String[] args) {
        BeanWrapper beanWrapperEmployee = new BeanWrapperImpl(new Employee());
        beanWrapperEmployee.setPropertyValue("name", "Joe");

        BeanWrapper beanWrapperDept = new BeanWrapperImpl(new Department());
        beanWrapperDept.setPropertyValue("deptCode", 1101);
        beanWrapperDept.setPropertyValue("deptName", "IT");

        beanWrapperEmployee.setPropertyValue("department", beanWrapperDept.getWrappedInstance());
        System.out.println(beanWrapperEmployee.getWrappedInstance());
    }
}

Output

Employee{name='Joe', department=Department{deptCode='1101', deptName='IT'}}

Setting nested bean via nested path

package com.logicbig.example;

import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

public class BeanWrapperNestedBean2 {
  public static void main (String[] args) {
      BeanWrapper bw = new BeanWrapperImpl(new Employee());
      bw.setPropertyValue("name", "Joe");
      bw.setPropertyValue("department", new Department());
      bw.setPropertyValue("department.deptCode", 1001);
      bw.setPropertyValue("department.deptName", "IT");
      System.out.println(bw.getWrappedInstance());
  }
}

Output

Employee{name='Joe', department=Department{deptCode='1001', deptName='IT'}}

Setting nested collection elements via index

package com.logicbig.example;

import java.util.List;
import java.util.Map;

public class EmployeeGroup {
    private String groupName;
    private List<Employee> employeeList;
    private Map<String, String> groupProperties;

    public String getGroupName() {
        return groupName;
    }

    public void setGroupName(String groupName) {
        this.groupName = groupName;
    }

    public List<Employee> getEmployeeList() {
        return employeeList;
    }

    public void setEmployeeList(List<Employee> employeeList) {
        this.employeeList = employeeList;
    }

    public Map<String, String> getGroupProperties() {
        return groupProperties;
    }

    public void setGroupProperties(Map<String, String> groupProperties) {
        this.groupProperties = groupProperties;
    }

    @Override
    public String toString() {
        return "EmployeeGroup{" +
                "groupName='" + groupName + '\'' +
                ", employeeList=" + employeeList +
                ", groupProperties=" + groupProperties +
                '}';
    }
}
package com.logicbig.example;

import org.springframework.beans.BeanWrapperImpl;
import java.util.ArrayList;
import java.util.HashMap;

public class BeanWrapperNestedIndexProperty {
  public static void main(String[] args) {
      BeanWrapperImpl bw = new BeanWrapperImpl(new EmployeeGroup());
      bw.setPropertyValue("groupName", "TennisTeam");
      bw.setPropertyValue("employeeList", new ArrayList<>());

      bw.setPropertyValue("employeeList[0]", new Employee());
      bw.setPropertyValue("employeeList[0].name", "Mike");
      bw.setPropertyValue("employeeList[0].department", new Department());
      bw.setPropertyValue("employeeList[0].department.deptCode", 1001);
      bw.setPropertyValue("employeeList[0].department.deptName", "Admin");

      bw.setPropertyValue("employeeList[1]", new Employee());
      bw.setPropertyValue("employeeList[1].name", "Jackie");
      bw.setPropertyValue("employeeList[1].department", new Department());
      bw.setPropertyValue("employeeList[1].department.deptCode", 1002);
      bw.setPropertyValue("employeeList[1].department.deptName", "Account");

      bw.setPropertyValue("groupProperties", new HashMap<>());
      bw.setPropertyValue("groupProperties[location]", "Texas");
      bw.setPropertyValue("groupProperties[matchesPerYear]", "2");

      System.out.println(bw.getWrappedInstance());

      System.out.println("-- accessing field values --");
      Object employeeList = bw.getPropertyValue("employeeList");
      System.out.println("employeeList: " + employeeList);
      Object firstEmployee = bw.getPropertyValue("employeeList[0]");
      System.out.println("employeeList[0]: " + firstEmployee);
      Object firstEmployeeDept = bw.getPropertyValue("employeeList[0].department.deptName");
      System.out.println("employeeList[0].department.deptName: " + firstEmployeeDept);
      Object matchesPerYear = bw.getPropertyValue("groupProperties[matchesPerYear]");
      System.out.println("groupProperties[matchesPerYear]: "+matchesPerYear);
  }
}

Output

EmployeeGroup{groupName='TennisTeam', employeeList=[Employee{name='Mike', department=Department{deptCode='1001', deptName='Admin'}}, Employee{name='Jackie', department=Department{deptCode='1002', deptName='Account'}}], groupProperties={location=Texas, matchesPerYear=2}}
-- accessing field values --
employeeList: [Employee{name='Mike', department=Department{deptCode='1001', deptName='Admin'}}, Employee{name='Jackie', department=Department{deptCode='1002', deptName='Account'}}]
employeeList[0]: Employee{name='Mike', department=Department{deptCode='1001', deptName='Admin'}}
employeeList[0].department.deptName: Admin
groupProperties[matchesPerYear]: 2

Example Project

Dependencies and Technologies Used:

  • spring-context 5.3.8: Spring Context. Version Compatibility: 3.2.3.RELEASE - 5.3.8 Version List
    ×

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    Versions in green have been tested.

  • JDK 8
  • Maven 3.8.1

Spring - BeanWrapper setting nested beans example Select All Download
  • spring-bean-wrapper-nested-bean-example
    • src
      • main
        • java
          • com
            • logicbig
              • example
                • BeanWrapperNestedBean.java

    See Also