JSR 303

Tobago has JSR 303 Validation support. With it, you can describe the validation in an annotation in the controller.

Required

In this example, the input cannot be empty - in other words, it's required. The value in the controller is annotated with @NotNull.

<tc:in label="Input" value="#{validationJsr303Controller.required}"/>

@NotNull private String required;

Input (required)

The length of the given string must be between 2 and 4 characters.

<tc:in label="Input" value="#{validationJsr303Controller.length}"/>

@Size(min = 2, max = 4, message = "Length must be between 2 and 4") private String length;

2 to 4 Character