@ValidatorClass(PasswordPolicyRestrictedValidator.class)
@Target({FIELD, METHOD})
@Retention(RUNTIME)
@Documented
public @interface PasswordPolicyRestricted {
  /** @return minimum number of characters from a-z (lower or upper case) */
  int minAlphas() default 0;

  /** @return minimum number of digits */
  int minDigits() default 0;

  /** @return error message key */
  String message() default "{validator.password_policy}";
}

public class PasswordPolicyRestrictedValidator implements
    Validator<PasswordPolicyRestricted> {

  Pattern ALPHA = Pattern.compile("[a-zA-Z]");
  Pattern DIGIT = Pattern.compile("\\d");

  private PasswordPolicyRestricted policy;

  /** @see Validator#initialize(Annotation) */
  public void initialize(PasswordPolicyRestricted passwordPolicy) {
    this.policy = passwordPolicy;
  }

  public boolean isValid(Object o) {
    if (o == null) {
      return false;
    }
    if (o instanceof String) {
      return isValid((String) o);
    }
    return isValid(o.toString());
  }

  /**
   * @param password
   *            the password to check
   * @return whether password is valid according to its annotation
   */
  public boolean isValid(String password) {
    return check(password, policy.minAlphas(), ALPHA)
        && check(password, policy.minDigits(), DIGIT);
  }

  /**
   * @param sequence
   *            the sequence to check
   * @param min
   *            minimum number of {@code pattern}
   * @param pattern
   *            the pattern to check
   */
  private boolean check(String sequence, int min, Pattern pattern) {
    if (min > 0) {
      Matcher m = pattern.matcher(sequence);
      int count = 0;
      while (m.find()) {
        count++;
      }
      if (min > count) {
        return false;
      }
    }
    return true;
  }
}

@Entity
public class Person {
   
   @Id
   @GeneratedValue
   @Column(name="person_id")
   private Long id;
   
   @Column (name="password", length=20)
   @PasswordPolicyRestricted
   private String password;
.........
}

<s:decorate id="passwordDecoration" template="layout/edit.xhtml">
    <ui:define name="label">Password:</ui:define>
    <h:inputText id="password"
               size="20"
          maxlength="20"
          required="true"
              value="#{personHome.instance.password}">
        <a:support event="onblur" reRender="passwordDecoration" bypassUpdates="true"/>
    </h:inputText>
</s:decorate>