jsf

Get JSF managed bean by name in any Servlet related class

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In a servlet based artifact, such as @WebServlet, @WebFilter and @WebListener, you can grab a “plain vanilla” JSF @ManagedBean @RequestScoped by: Bean bean = (Bean) request.getAttribute(“beanName”); and @ManagedBean @SessionScoped by: Bean bean = (Bean) request.getSession().getAttribute(“beanName”); and @ManagedBean @ApplicationScoped by: Bean bean = (Bean) getServletContext().getAttribute(“beanName”); Note that this prerequires that the bean is already autocreated by … Read more

How to use PrimeFaces p:fileUpload? Listener method is never invoked or UploadedFile is null / throws an error / not usable

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How to configure and troubleshoot <p:fileUpload> depends on PrimeFaces and JSF version. All PrimeFaces versions The below requirements apply to all PrimeFaces versions: The enctype attribute of the <h:form> needs to be set to multipart/form-data. When this is absent, the ajax upload may just work, but the general browser behavior is unspecified and dependent on … Read more

How to use enum values in f:selectItem(s)

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JSF has a builtin converter for enum, so this should do: @Named @ApplicationScoped public class Data { public Status[] getStatuses() { return Status.values(); } } with <h:selectOneMenu value=”#{bean.question.status}” > <f:selectItems value=”#{data.statuses}” /> </h:selectOneMenu> (note: since JSF 2.0 there’s no need anymore to provide a SelectItem[] or List<SelectItem>, a T[] and List<T> are accepted as well … Read more

When should I use h:outputLink instead of h:commandLink?

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The <h:outputLink> renders a fullworthy HTML <a> element with the proper URL in the href attribute which fires a bookmarkable GET request. It cannot directly invoke a managed bean action method. <h:outputLink value=”destination.xhtml”>link text</h:outputLink> The <h:commandLink> renders a HTML <a> element with an onclick script which submits a (hidden) POST form and can invoke a … Read more

What jsf component can render a div tag?

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You can create a DIV component using the <h:panelGroup/>. By default, the <h:panelGroup/> will generate a SPAN in the HTML code. However, if you specify layout=”block”, then the component will be a DIV in the generated HTML code. <h:panelGroup layout=”block”/>

Identifying and solving javax.el.PropertyNotFoundException: Target Unreachable

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1. Target Unreachable, identifier ‘bean’ resolved to null This boils down to that the managed bean instance itself could not be found by exactly that identifier (managed bean name) in EL like so #{bean}. Identifying the cause can be broken down into three steps: a. Who’s managing the bean? b. What’s the (default) managed bean … Read more

What can , and be used for?

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Process GET parameters The <f:viewParam> manages the setting, conversion and validation of GET parameters. It’s like the <h:inputText>, but then for GET parameters. The following example <f:metadata> <f:viewParam name=”id” value=”#{bean.id}” /> </f:metadata> does basically the following: Get the request parameter value by name id. Convert and validate it if necessary (you can use required, validator … Read more

Performing user authentication in Java EE / JSF using j_security_check

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I suppose you want form based authentication using deployment descriptors and j_security_check. You can also do this in JSF by just using the same predefinied field names j_username and j_password as demonstrated in the tutorial. E.g. <form action=”j_security_check” method=”post”> <h:outputLabel for=”j_username” value=”Username” /> <h:inputText id=”j_username” /> <br /> <h:outputLabel for=”j_password” value=”Password” /> <h:inputSecret id=”j_password” /> … Read more

JSTL in JSF2 Facelets… makes sense?

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Introduction JSTL <c:xxx> tags are all taghandlers and they are executed during view build time, while JSF <h:xxx> tags are all UI components and they are executed during view render time. Note that from JSF’s own <f:xxx> and <ui:xxx> tags only those which do not extend from UIComponent are also taghandlers, e.g. <f:validator>, <ui:include>, <ui:define>, … Read more

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