Syboos Commons BeanUtils validators - ValidateIn

    @ValidateIn({"a", "b", "c"})
    private String name;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    @ValidateIn(when="login", message="value must be 'a', 'b' or 'c'", value="{"a", "b", "c"}")
    private String name;

<field  name="name">
    <validator class="com.syboos.beanutils.validator.InValidator" message="value must be 'a', 'b' or 'c'" />
</field>