为什么不起作用?

I use JSF 2.0, hibernate-validator4.2.jar validation-api.jar tomcat and Eclipse.

我使用了JSF 2.0、hibernate-validator4.2。jar验证api。jar tomcat和Eclipse。

I put @Size(min=3, message="xxx") annotation in a @ManagedBean and <f:validateBean /> between <h:inputText value="#{user.name}"></h:inputText>

我在@ManagedBean和之间输入@Size(min=3, message="xxx")注释

When I try to run the project i get this error...

当我试图运行这个项目时，我得到了这个错误……

exception

javax.servlet.ServletException: Expression Error: Named Object: javax.faces.Bean not found.
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:606)

root cause

javax.faces.FacesException: Expression Error: Named Object: javax.faces.Bean not found.
    com.sun.faces.application.ApplicationImpl.createValidator(ApplicationImpl.java:1593)
    com.sun.faces.facelets.tag.jsf.ValidatorTagHandlerDelegateImpl.createValidator(ValidatorTagHandlerDelegateImpl.java:244)
    com.sun.faces.facelets.tag.jsf.ValidatorTagHandlerDelegateImpl.applyAttachedObject(ValidatorTagHandlerDelegateImpl.java:132)
    com.sun.faces.facelets.tag.jsf.ValidatorTagHandlerDelegateImpl.applyNested(ValidatorTagHandlerDelegateImpl.java:211)
    com.sun.faces.facelets.tag.jsf.ValidatorTagHandlerDelegateImpl.apply(ValidatorTagHandlerDelegateImpl.java:87)
    javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
    javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137)

why? (this only appears when i put tag)

为什么?(这只在我加标签时出现)

User.java

import java.io.Serializable;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.validation.constraints.Size;

@ManagedBean(name="user")
@SessionScoped
public class User{
    @Size(min=3, message="At least 3 characters!")
    private String name;


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

}

adduser.xhtml

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core">

<ui:composition template="/templates/master_layout.xhtml">
    <ui:define name="text_header" >Panou de control: Adauga user    </ui:define>
    <ui:define name="content">
        <h:panelGrid columns="3">
            <h:outputText value="Name"></h:outputText>
            <h:inputText  value="#{user.name}"> 
                <f:validateBean />
             </h:inputText>

            <h:commandButton value="Inregistreaza" action="index.xhtml"></h:commandButton>
        </h:panelGrid>
    </ui:define>
</ui:composition>
</html>

1 个解决方案

#1

It should work perfectly fine, although the empty <f:validateBean/> tag is entirely superfluous in this context. It's supposed to be used to "finetune" validation more, such as grouping of validation and/or disabling the implicit bean validation on a per-input basis by specifying the desired tag attributes. You have however no attributes on that tag, so just remove that tag altogether. On a default JSF 2 + JSR 303 project setup, it's supposed to kick in fully transparently without adding more JSF tags whenever there's a JSR 303 annotation on the property such as @Size and likes.

虽然空标记在此上下文中完全是多余的，但它应该可以很好地工作。它应该更多地用于“finetune”验证，比如对验证进行分组，或者通过指定所需的标记属性在每个输入的基础上禁用隐式bean验证。但是，您在该标记上没有属性，因此只需完全删除该标记。在默认的JSF 2 + JSR 303项目设置中，当属性(如@Size和like)上有JSR 303注释时，它应该完全透明地启动，而不添加更多的JSF标记。

But I don't think that removing the tag will solve this particular exception. Your problem lies thus deeper. This validator is supposed to be auto-registered on startup. However, the exception basically tells that the validator is not registered at all. With the information given so far, it's not possible to give a targeted answer. I can think of the following possible causes:

但是我不认为移除标签会解决这个特殊的异常。因此，你的问题更深层。这个验证器应该在启动时自动注册。但是，这个异常基本上告诉验证器根本没有注册。根据目前给出的信息，不可能给出一个有针对性的答案。我可以想到以下可能的原因:

There's a bug in the JSF implementation which you're using. Upgrade it to a newer version.
您正在使用的JSF实现中有一个错误。升级到更新的版本。
You have multiple JSF libraries of different versions in your classpath. Cleanup it.
在类路径中有多个不同版本的JSF库。清理它。
The faces-config.xml root declaration is not declared conform JSF 2.x. Fix it.
faces-config。xml根声明没有声明遵循JSF 2.x。解决它。

#1

There's a bug in the JSF implementation which you're using. Upgrade it to a newer version.
您正在使用的JSF实现中有一个错误。升级到更新的版本。
You have multiple JSF libraries of different versions in your classpath. Cleanup it.
在类路径中有多个不同版本的JSF库。清理它。
The faces-config.xml root declaration is not declared conform JSF 2.x. Fix it.
faces-config。xml根声明没有声明遵循JSF 2.x。解决它。

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为什么不起作用?

1 个解决方案

#1

#1

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