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我目前在尝试将转换器和验证器添加到单个字段时遇到了上面指定的问题。我知道这两个是如何工作的，因为我以前使用过它们，但这是我第一次在一个领域同时尝试它们。这是我的代码：

<p:selectOneMenu id="bussProgram"
    value="#{signupWizardBean.subscription.businessProgram}">
    <f:converter binding="#{membershipProgramConverter}"></f:converter>
    <f:validator binding="#{dropdownValidator}"></f:validator>
    <f:selectItems value="#{signupWizardBean.membershipPrograms}"
        var="plan" itemValue="#{plan}"
        itemLabel="#{plan.description}" />
</p:selectOneMenu>

转换器

@Named
@ApplicationScoped
public class MembershipProgramConverter implements Converter {
    @PersistenceContext
    private transient EntityManager em;

    @Inject
    private Logger log;

    @Override
    public Object getAsObject(FacesContext ctx, UIComponent component,
        String value) {
    if (StringUtils.isBlank(value) || value.equals("0"))
        return null;

    return em.find(MembershipProgram.class, new Long(value));
}

    @Override
    public String getAsString(FacesContext fc, UIComponent uic, Object o) {
        MembershipProgram mp = (MembershipProgram) value;
    return mp.getId() != null ? String.valueOf(mp.getId()) : null;
    }
}

验证器：

@Named
@ApplicationScoped
public class DropdownValidator implements Validator, Serializable {
    private static final long serialVersionUID = -456545939475878299L;

    @Inject
    private ResourceBundle bundle;

    @Inject
    private FacesContext facesContext;

    @Inject
    private Logger log;

    @Override
    public void validate(FacesContext context, UIComponent component,
        Object value) throws ValidatorException {
    log.debug("[dropship-web] validating value={}", value);
    if (value == null) {
        FacesMessage msg = new FacesMessage(
                bundle.getString("error.requiredField"),
                bundle.getString("error.requiredField"));
        msg.setSeverity(FacesMessage.SEVERITY_ERROR);
        facesContext.addMessage("promoCode", msg);

        throw new ValidatorException(msg);
    }
}
}

实体类：

@Entity
@Table(name = "CRM_MEMBERSHIP_PROGRAMS", uniqueConstraints = @UniqueConstraint(columnNames = { "code" }))
@SequenceGenerator(name = "ID_GENERATOR", sequenceName = "CRM_MEMBERSHIP_PROGRAM_SEQ")
public class MembershipProgram extends BaseEntity {
    private static final long serialVersionUID = -7796298586810386239L;

    @Size(max = 25)
    @Column(name = "CODE", nullable = false)
    private String code;

    @Size(max = 100)
    @Column(name = "DESCRIPTION", nullable = true)
    private String description;

    public MembershipProgram() {

    }

    public MembershipProgram(long id, String description) {
        setId(id);
        this.description = description;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = super.hashCode();
        result = prime * result + ((code == null) ? 0 : code.hashCode());
        result = prime * result
                + ((description == null) ? 0 : description.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (!super.equals(obj))
            return false;
        if (getClass() != obj.getClass())
            return false;
        MembershipProgram other = (MembershipProgram) obj;
        if (code == null) {
            if (other.code != null)
                return false;
        } else if (!code.equals(other.code))
            return false;
        if (description == null) {
            if (other.description != null)
                return false;
        } else if (!description.equals(other.description))
            return false;
        return true;
    }
}

请注意，在调试时：同时调用 MembershipProgramConverter.getAsObject/getAsString、DropdownValidator.validate 方法。

我还发现无论有没有从下拉列表中选择的项目，我都会遇到：

.validation.UnexpectedTypeException: HV000030: No validator could be found for type: com.czetsuya.models.membership.MembershipProgram.
javax.validation.UnexpectedTypeException: HV000030: No validator could be found for type: com.czetsuya.models.membership.MembershipProgram.
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1 回答 1

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最后我能够找出问题所在，我在目标实体上添加了@Size注释，只是删除了@Size：

@Size(max = 25)
@OneToOne(optional = false)
@JoinColumn(name = "BUSINESS_PROGRAM", nullable = false)
private MembershipProgram businessProgram;

当我删除@Size时，问题解决了，但我遇到了一个新问题，提交时表单总是抛出：

Validation Error: Value is not valid

要修复 Value 无效，请确保您已正确实现 Model.equals 方法。我的错是我依赖 eclipse 生成哈希码和 equals 功能，我没有注意到它从我的 BaseEntity 调用 equals 方法。

于 2012-12-24T10:07:44.173 回答