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)