spring 将两个验证注释合二为一

我在用着Spring+Hibernate+Spring-MVC.
我想定义一个结合其他两个预定义验证注释的自定义约束：@NotNull @Size像这样：

import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

@NotNull
@Size(min=4)
public @interface JPasswordConstraint {
} // this is not correct. It's just a suggestion.

我想在我的表单模型中使用此注释。

public class ChangePasswordForm {

  @NotNull
  private String currentPass;

  @JPasswordConstraint
  private String newPass;

  @JPasswordConstraint
  private String newPassConfirm;
}

用户控制器.java

@RequestMapping(value = "/pass", method = RequestMethod.POST)
public String pass2(Model model, @Valid @ModelAttribute("changePasswordForm") ChangePasswordForm form, BindingResult result) {
    model.addAttribute("changePasswordForm", form);
    try {
        userService.changePassword(form);
    } catch (Exception ex) {
        result.rejectValue(null, "error.objec", ex.getMessage());
        System.out.println(result);
    }
    if (!result.hasErrors()) {
        model.addAttribute("successMessage", "password changed successfully!");
    }
    return "user/pass";
}

但这不起作用。它接受少于 4 个字符的密码。
我怎么解决这个问题？

这有点晚了，但是结合中描述的验证注释的技术

https://docs.jboss.org/hibernate/stable/validator/reference/en-US/html_single/?v=5.4#section-constraint-composition https://docs.jboss.org/hibernate/stable/validator/reference/en-US/html_single/?v=5.4#section-constraint-composition

在撰写本文时，它可能不可用，但解决方案如下

@NotNull
@Size(min=4)
@Target({ METHOD, FIELD, ANNOTATION_TYPE })
@Retention(RUNTIME)
@Constraint(validatedBy = { })
@Documented
public @interface JPasswordConstraint {
    String message() default "Password is invalid";
    Class<?>[] groups() default { };
    Class<? extends Payload>[] payload() default { };
 }