@NotEmpty annotation can be applied on any CharSequence, Collection, Map and array, it makes sure that element must not be null and empty.
Example
@NotEmpty
private String name;
Where can I apply this annotation?
a. METHOD
b. FIELD
c. ANNOTATION_TYPE
d. CONSTRUCTOR
e. PARAMETER
f. TYPE_USE
Employee.java
package com.sample.app.model;
import javax.validation.constraints.NotEmpty;
public class Employee {
private int id;
@NotEmpty
private String name;
private int age;
public Employee(int id, String name, int age) {
this.id = id;
this.name = name;
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
Test.java
package com.sample.app;
import java.util.Set;
import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import com.sample.app.model.Employee;
public class Test {
private static ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory();
private static Validator validator = validatorFactory.getValidator();
private static void validateBean(Employee emp) {
System.out.println("************************************");
Set<ConstraintViolation<Employee>> validationErrors = validator.validate(emp);
if (validationErrors.size() == 0) {
System.out.println("No validation errors....");
}
for (ConstraintViolation<Employee> violation : validationErrors) {
System.out.println(violation.getPropertyPath() + "," + violation.getMessage());
}
System.out.println("");
}
public static void main(String args[]) {
Employee emp1 = new Employee(1, null, 28);
System.out.println("Validation errors on bean emp1");
validateBean(emp1);
Employee emp2 = new Employee(2, "", 59);
System.out.println("Validation errors on bean emp2");
validateBean(emp2);
Employee emp3 = new Employee(3, " ", 9);
System.out.println("Validation errors on bean emp3");
validateBean(emp3);
Employee emp4 = new Employee(4, "Sailaja", 24);
System.out.println("Validation errors on bean emp4");
validateBean(emp4);
}
}
Output
Validation errors on bean emp1 ************************************ name,must not be empty Validation errors on bean emp2 ************************************ name,must not be empty Validation errors on bean emp3 ************************************ No validation errors.... Validation errors on bean emp4 ************************************ No validation errors....
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