我正在尝试使用OmniFaces的一个小的改编将一个复合组件动态添加到另一个UIComponent
Faces.includeCompositeComponent(...)
我试着重现
this question
但它不起作用。
适用方法的代码如下(我取自
OmniFaces v1.6版本
)
/**
* Create and include the composite component of the given library ane
* resource name as child of the given UI component parent and return the
* created composite component. This has the same effect as using
* <code><my:resourceName></code>. The given component ID must be unique
* relative to the current naming container parent and is mandatory for
* functioning of input components inside the composite, if any.
*
* @param parent The parent component to include the composite component in.
* @param libraryName The library name of the composite component.
* @param resourceName The resource name of the composite component.
* @param id The component ID of the composite component.
* @return The created composite component, which can if necessary be further
* used to set custom attributes or value expressions on it.
* @since 1.5
*/
public static UIComponent includeCompositeComponent(UIComponent parent, String libraryName, String resourceName, String id)
{
// Prepare.
FacesContext context = FacesContext.getCurrentInstance();
Application application = context.getApplication();
FaceletContext faceletContext = (FaceletContext) context.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);
// This basically creates <ui:component> based on <composite:interface>.
Resource resource = application.getResourceHandler().createResource(resourceName, libraryName);
UIComponent composite = application.createComponent(context, resource);
composite.setId(id); // Mandatory for the case composite is part of UIForm!
// Otherwise JSF can't find inputs.
// This basically creates <composite:implementation>.
UIComponent implementation = application.createComponent(UIPanel.COMPONENT_TYPE);
implementation.setRendererType("javax.faces.Group");
composite.getFacets().put(UIComponent.COMPOSITE_FACET_NAME, implementation);
// Now include the composite component file in the given parent.
parent.getChildren().add(composite);
parent.pushComponentToEL(context, composite); // This makes #{cc} available.
try
{
faceletContext.includeFacelet(implementation, resource.getURL());
}
catch (IOException e)
{
throw new FacesException(e);
}
finally
{
parent.popComponentFromEL(context);
}
return composite;
}
这就是我尝试使用它的方式
JSFUtils.includeCompositeComponent(panelGroup, "comp",
"../inc-templates/test.xhtml", JSFUtils.createUniqueId());
此外,我创建了“test.xhtml”文件,并将其放在
WEB-INF/inc-templates/test.xhtml
。内容如下:
测试.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:cc="http://java.sun.com/jsf/composite"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui"
xmlns:composite="http://java.sun.com/jsf/composite">
<!-- INTERFACE -->
<cc:interface>
</cc:interface>
<!-- IMPLEMENTATION -->
<cc:implementation>
<h:outputText value="TEST"/>
</cc:implementation>
</html>
最后但同样重要的是,我将test.xhtml标记添加到
标签库.xml
,如下所示:
<tag>
<tag-name>test</tag-name>
<source>../inc-templates/test.xhtml</source>
</tag>
问题是,当我运行代码并尝试插入组件时,我会得到以下异常
Caused by: java.lang.NullPointerException: Argumentfehler: Parameter componentResource ist null
at com.sun.faces.util.Util.notNull(Util.java:314)
at com.sun.faces.application.ApplicationImpl.createComponent(ApplicationImpl.java:928)
at org.my.JSFUtils.includeCompositeComponent(JSFUtils.java:496)
和线路
网址:org.my.JSFUtils.includeCompositeComponent(JSFUtils.cava:496)
确切地指代码行
UIComponent composite = application.createComponent(context, resource);
,这实际上表明资源不是在前一行中创建的:
Resource resource = application.getResourceHandler().createResource(resourceName, libraryName);
有人知道为什么会发生这种事吗?。我甚至尝试将资源的位置更改为
inc-templates/test.xhtml
甚至只是
测试.xhtml
调用该方法时,但什么都不起作用。。。我总是犯同样的错误。
顺便说一句,我正在尝试在Websphere 8中进行部署,我正在使用ICEFaces 3。
提前谢谢!
