Question

validation-api-1.0.0.GA.jar and hibernate-validator-4.1.0.Final.jar are in classpath. 


mvc:annotation-driven is in -servlet.xml file.


@RequestMapping(value = "/addEmployee", method = RequestMethod.POST)
public ModelAndView addEmployee(@Valid EmployeeDTO employeeDTO,
BindingResult result)
{

   System.out.println("addEmployee employeeDTO! "+ employeeDTO);
       System.out.println("result.getErrorCount()  "+result.getErrorCount());

}



public class EmployeeDTO {

private int employeeId;
public int getEmployeeId() {
    return employeeId;
}


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

@NotNull
private String firstName;
@NotNull 
private String lastName;
private Date hireDate;

}

 in the console

 addEmployee employeeDTO! EmployeeDTO [employeeId=0, firstName=, lastName=, deptName=null, deptId=0, email=, salary=0, jobId=AD_VP, hireDate=null]
result.getErrorCount()  0

Answer 1

The DTO doesn’t seem to be invalid, according to the console message that you quoted. The firstName and lastName fields seem to be set as empty strings "", not null; therefore, there’s no reason for the validation to reject your bean.

If you want empty input fields to be bound as null (and rejected by validation), you can register a StringTrimmerEditor in your binder.