I want to create dynamic dialog windows by using <ui:repeat>
and <p:dialog>
with <ui:include>
. But there's an exception when I tried like below.
main.xhtml
<p:outputPanel id="windowsPanel" layout="block" style="width:100%;">
<p:outputPanel rendered="#{mainView.dynamicWindows ne null}">
<ui:repeat var="item" value="#{mainView.dynamicWindows}">
<p:dialog binding="#{item.dialog}">
<ui:include src="#{item.includedWindowPath}" />
</p:dialog>
</ui:repeat>
</p:outputPanel>
</p:outputPanel>
MainView.java
@ManagedBean(name = "mainView")
@SessionScoped
public class MainView extends BaseView {
private static final long serialVersionUID = -6291834350102049312L;
private List<Window> dynamicWindows;
@PostConstruct
public void init() {
fillWindows();
}
private void fillWindows() {
dynamicWindows = new ArrayList<Window>();
for (int i = 0; i < 3; i++) {
Window window = new Window("Header " + i);
window.getDialog().setId("_dynamicWindow" + i);
window.getDialog().setWidgetVar("_dynamicWindowWidget" + i);
dynamicWindows.add(window);
}
}
// getters & setters
The exception:
javax.servlet.ServletException: /main.xhtml @33,42 binding="#{item.dialog}": Target Unreachable, identifier 'item' resolved to null
javax.faces.webapp.FacesServlet.service(FacesServlet.java:422)
org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:369)
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:97)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:100)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:78)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:35)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:187)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:168)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
The <ui:include>
is a tag handler which runs during view build time, while the <ui:repeat>
is an UI component which runs during view render time. Tag handlers produces the JSF UI component tree. JSF UI components produces HTML. They do not run in sync.
So, when the <ui:include>
runs, the #{item}
which is specified by <ui:repeat var>
is simply not available in the scope, because the <ui:repeat>
hasn't run at that time. You need an iterating tag handler instead of an iterating JSF UI component. The JSTL <c:forEach>
is such one. Replacing <ui:repeat>
by <c:forEach>
should fix this issue. It may however have undesireable side effects. It's hard to tell beforehand as your concrete functional requirements are not fully clear.