Let's define a few validations on the Todo bean:
public class Todo { private int id; @NotNull private String user; @Size(min = 9, message = "Enter atleast 10 Characters.") private String desc;
Some important points to note are as follows:
- @NotNull: Validates that the user field is not empty
- @Size(min = 9, message = "Enter atleast 10 Characters."): Checks whether the desc field has at least nine characters
There are a number of other annotations that can be used to validate beans. The following are some of the Bean Validation annotations:
- @AssertFalse, @AssertTrue: For Boolean elements. Checks the annotated element.
- @AssertFalse: Checks for false. @Assert checks for true.
- @Future: The annotated element ...
