Update validator target to Type only

src/main/resources/handlebars/JavaSpring/NotUndefined.mustache

@@ -4,7 +4,7 @@ import javax.validation.Constraint;
 import javax.validation.Payload;
 import java.lang.annotation.*;
 
-@Target({ElementType.FIELD, ElementType.TYPE})
+@Target({ElementType.TYPE})
 @Retention(RetentionPolicy.RUNTIME)
 @Documented
 @Constraint(validatedBy = NotUndefinedValidator.class)