[#257] Set the default validatedBy on the Constraint annotation

as part of: Support ConstraintValidator declaration via service loader [BVAL-645]

since there are different ways a constraint validator can be registered, there is no need to require an array of validators on constraint annotation...

Author: marko-bekhta

src/main/java/jakarta/validation/Constraint.java

@@ -90,5 +90,5 @@
 	 *
 	 * @return array of {@link ConstraintValidator} classes implementing the constraint
 	 */
-	Class<? extends ConstraintValidator<?, ?>>[] validatedBy();
+	Class<? extends ConstraintValidator<?, ?>>[] validatedBy() default {};
 }

src/main/java/jakarta/validation/constraints/AssertFalse.java

@@ -35,7 +35,7 @@
 @Retention(RUNTIME)
 @Repeatable(List.class)
 @Documented
-@Constraint(validatedBy = { })
+@Constraint
 public @interface AssertFalse {
 
 	String message() default "{jakarta.validation.constraints.AssertFalse.message}";

src/main/java/jakarta/validation/constraints/AssertTrue.java

@@ -35,7 +35,7 @@
 @Retention(RUNTIME)
 @Repeatable(List.class)
 @Documented
-@Constraint(validatedBy = { })
+@Constraint
 public @interface AssertTrue {
 
 	String message() default "{jakarta.validation.constraints.AssertTrue.message}";

src/main/java/jakarta/validation/constraints/DecimalMax.java

@@ -46,7 +46,7 @@
 @Retention(RUNTIME)
 @Repeatable(List.class)
 @Documented
-@Constraint(validatedBy = { })
+@Constraint
 public @interface DecimalMax {
 
 	String message() default "{jakarta.validation.constraints.DecimalMax.message}";

src/main/java/jakarta/validation/constraints/DecimalMin.java

@@ -46,7 +46,7 @@
 @Retention(RUNTIME)
 @Repeatable(List.class)
 @Documented
-@Constraint(validatedBy = { })
+@Constraint
 public @interface DecimalMin {
 
 	String message() default "{jakarta.validation.constraints.DecimalMin.message}";

src/main/java/jakarta/validation/constraints/Digits.java

@@ -43,7 +43,7 @@
 @Retention(RUNTIME)
 @Repeatable(List.class)
 @Documented
-@Constraint(validatedBy = { })
+@Constraint
 public @interface Digits {
 
 	String message() default "{jakarta.validation.constraints.Digits.message}";

src/main/java/jakarta/validation/constraints/Email.java

@@ -34,11 +34,11 @@
  *
  * @since 2.0
  */
-@Documented
-@Constraint(validatedBy = { })
 @Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
 @Retention(RUNTIME)
 @Repeatable(List.class)
+@Documented
+@Constraint
 public @interface Email {
 
 	String message() default "{jakarta.validation.constraints.Email.message}";

src/main/java/jakarta/validation/constraints/Future.java

@@ -61,7 +61,7 @@
 @Retention(RUNTIME)
 @Repeatable(List.class)
 @Documented
-@Constraint(validatedBy = { })
+@Constraint
 public @interface Future {
 
 	String message() default "{jakarta.validation.constraints.Future.message}";

src/main/java/jakarta/validation/constraints/FutureOrPresent.java

@@ -67,7 +67,7 @@
 @Retention(RUNTIME)
 @Repeatable(List.class)
 @Documented
-@Constraint(validatedBy = { })
+@Constraint
 public @interface FutureOrPresent {
 
 	String message() default "{jakarta.validation.constraints.FutureOrPresent.message}";

src/main/java/jakarta/validation/constraints/Max.java

@@ -46,7 +46,7 @@
 @Retention(RUNTIME)
 @Repeatable(List.class)
 @Documented
-@Constraint(validatedBy = { })
+@Constraint
 public @interface Max {
 
 	String message() default "{jakarta.validation.constraints.Max.message}";