我在使用纯 JSF 2 页面时遇到问题。加载页面时,会显示两个 inputText 和一个 select。每个右侧都有一个验证字段。这两个输入是必填字段,而 select 总是有一个选择,所以它根本不验证(至少它不应该)。
这是一个屏幕截图:

这是单击“创建”按钮时显示的内容。重新点击创建按钮时,会出现以下弹出窗口:

好的,没有代码什么都没有,这里是 XHTML:
<?xml version="1.0" encoding="UTF-8"?>
<!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:f="http://java.sun.com/jsf/core"
      xmlns:h="http://java.sun.com/jsf/html">
  <h:head>
  </h:head>
  <h:body>
    <h:form>
      <h:panelGrid columns="3" id="base-data-grid">
        <h:outputLabel value="Name:*" for="name-input" />
        <h:inputText value="#{testBean.name}"
                     requiredMessage="Name required!"
                     id="name-input">
          <f:validateRequired />
        </h:inputText>
        <h:message for="name-input" style="color: red;" />
        <h:outputLabel value="Code:*" for="code-input" />
        <h:inputText value="#{testBean.code}"
                     requiredMessage="Code required!"
                     id="code-input">
          <f:validateRequired />
        </h:inputText>
        <h:message for="code-input" style="color: red;" />
        <h:outputLabel value="Location:" for="location-select" />
        <h:selectOneMenu value="#{testBean.location}"
                         converter="#{testConverter}"
                         id="location-select">
          <f:selectItems value="#{testBean.locations}"
                         var="l"
                         itemValue="#{l}"
                         itemLabel="#{l.name}" />
        </h:selectOneMenu>
        <h:message for="location-select" style="color: red;" />
      </h:panelGrid>
      <h:panelGrid columns="1">
        <h:commandButton value="Create"
                           action="#{testBean.create}">
          <f:ajax execute="base-data-grid" render="base-data-grid lalala" />
        </h:commandButton>
      </h:panelGrid>
      <h:messages id="lalala" />
    </h:form>
  </h:body>
</html>
选择的位置类(只是一个名称):
public class Location
{
    private String name;
    public Location(String name)
    {
        this.name = name;
    }
    public String getName()
    {
        return name;
    }
}
转换器(作为 CDI 版本):
import javax.enterprise.context.RequestScoped;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.inject.Inject;
import javax.inject.Named;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Named
@RequestScoped
public class TestConverter implements Converter
{
    private static final Logger log = LoggerFactory.getLogger(TestConverter.class);
    @Inject
    private TestBean testBean;
    @Override
    public Object getAsObject(FacesContext arg0, UIComponent arg1, String name)
    {
        log.info(getClass().getSimpleName() + ".getAsObject: " + name);
        return testBean.getLocationFor(name);
    }
    @Override
    public String getAsString(FacesContext arg0, UIComponent arg1, Object obj)
    {
        log.info(getClass().getSimpleName() + ".getAsString: " + obj);
        return ((Location)obj).getName();
    }
}
和测试豆:
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.enterprise.context.SessionScoped;
import javax.inject.Named;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Named
@SessionScoped
public class TestBean implements Serializable
{
    private static final Logger log = LoggerFactory.getLogger(TestBean.class);
    private String name;
    private String code;
    private Location location;
    private List<Location> locations;
    @PostConstruct
    public void init()
    {
        locations = new ArrayList<Location>();
        locations.add(new Location("Berlin"));
        locations.add(new Location("London"));
        locations.add(new Location("New York"));
        locations.add(new Location("Moscow"));
        locations.add(new Location("Bejing"));
        location = locations.get(2);
    }
    public String getName()
    {
        return name;
    }
    public void setName(String name)
    {
        this.name = name;
    }
    public String getCode()
    {
        return code;
    }
    public void setCode(String code)
    {
        this.code = code;
    }
    public Location getLocation()
    {
        return location;
    }
    public void setLocation(Location location)
    {
        this.location = location;
    }
    public List<Location> getLocations()
    {
        return locations;
    }
    public void setLocations(List<Location> locations)
    {
        this.locations = locations;
    }
    public void create()
    {
        log.info("Creating new whatever...");
    }
    // for converter to mimic DB query
    public Location getLocationFor(String name)
    {
        for ( Location location : locations )
        {
            if ( location.getName().equals(name) )
            {
                return location;
            }
        }
        return null;       
    }
}
正如您所看到的,页面应该做的事情并不多。验证两个输入字段,显示选择并调用 testBean.create 如果一切都验证正常。
但是,一旦验证运行一次,随后每次单击 Create 按钮都会导致该 serverError。
注意,如果您完全删除 f:selectItems 或 h:selectOneMenu,页面将按预期工作。这就是让整个事情变得如此奇怪的原因......
我不知道这里发生了什么。有人知道出了什么问题吗?
我在此处附加了一个 JBoss AS 7 测试应用程序:https ://community.jboss.org/thread/202501 (重复发帖,抱歉需要很多帮助)。
请看一下这个非常奇怪的 IllegalStateException。JBAS server.log 中甚至没有任何内容...
PS:Mojarra版本当然是2.1.7(JBoss AS 7.1.1.Final自带的那个)