If you annotate any element with @AssertTrue annotation, then the annotated element must be true.
Example
@AssertTrue
private boolean isExperienced;
What are the supported types?
a. boolean
b. Boolean
Where can I apply this annotation?
a. METHOD,
b. FIELD,
c. ANNOTATION_TYPE,
d. CONSTRUCTOR,
e. PARAMETER,
f. TYPE_USE
Find the below working application.
Employee.java
package com.sample.model;
import javax.validation.constraints.AssertTrue;
public class Employee {
private int id;
@AssertTrue
private boolean isExperienced;
public Employee(int id, boolean isExperienced) {
this.id = id;
this.isExperienced = isExperienced;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public boolean isExperienced() {
return isExperienced;
}
public void setExperienced(boolean isExperienced) {
this.isExperienced = isExperienced;
}
}
Test.java
package com.sample.test;
import java.util.Set;
import javax.validation.*;
import javax.validation.ValidatorFactory;
import com.sample.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(123, false);
System.out.println("Validation errors on bean emp1");
validateBean(emp1);
Employee emp2 = new Employee(234, true);
System.out.println("Validation errors on bean emp2");
validateBean(emp2);
}
}
Output
Validation errors on bean emp1 ************************************ isExperienced,must be true Validation errors on bean emp2 ************************************ No validation errors....
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