Bean Validation: @AssertTrue: Validate trueness of the element

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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