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POHow to programmatically or dynamically create a composite component in JSF 2
 

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    <p>I need to programatically create composite components in JSF 2. After few days of searching and experiments I figure out this method (higly inspired by Lexi at java.net): </p> <pre><code>/** * Method will attach composite component to provided component * @param viewPanel parent component of newly created composite component */ public void setComponentJ(UIComponent viewPanel) { FacesContext context = FacesContext.getCurrentInstance(); viewPanel.getChildren().clear(); // load composite component from file Resource componentResource = context.getApplication().getResourceHandler().createResource("whatever.xhtml", "components/form"); UIComponent composite = context.getApplication().createComponent(context, componentResource); // push component to el composite.pushComponentToEL(context, composite); boolean compcompPushed = false; CompositeComponentStackManager ccStackManager = CompositeComponentStackManager.getManager(context); compcompPushed = ccStackManager.push(composite, CompositeComponentStackManager.StackType.TreeCreation); // Populate the component with value expressions Application application = context.getApplication(); composite.setValueExpression("value", application.getExpressionFactory().createValueExpression( context.getELContext(), "#{stringValue.value}", String.class)); // Populate the component with facets and child components (Optional) UIOutput foo = (UIOutput) application.createComponent(HtmlOutputText.COMPONENT_TYPE); foo.setValue("Foo"); composite.getFacets().put("foo", foo); UIOutput bar = (UIOutput) application.createComponent(HtmlOutputText.COMPONENT_TYPE); bar.setValue("Bar"); composite.getChildren().add(bar); // create composite components Root UIComponent compositeRoot = context.getApplication().createComponent(UIPanel.COMPONENT_TYPE); composite.getAttributes().put(Resource.COMPONENT_RESOURCE_KEY, componentResource); compositeRoot.setRendererType("javax.faces.Group"); composite.setId("compositeID"); try { FaceletFactory factory = (FaceletFactory) RequestStateManager.get(context, RequestStateManager.FACELET_FACTORY); Facelet f = factory.getFacelet(componentResource.getURL()); f.apply(context, compositeRoot); //&lt;==[here] } catch (Exception e) { log.debug("Error creating composite component!!", e); } composite.getFacets().put( UIComponent.COMPOSITE_FACET_NAME, compositeRoot); // attach composite component to parent componet viewPanel.getChildren().add(composite); // pop component from el composite.popComponentFromEL(context); if (compcompPushed) { ccStackManager.pop(CompositeComponentStackManager.StackType.TreeCreation); } } </code></pre> <p>Problem is that this code works for me only when javax.faces.PROJECT_STAGE is set to PRODUCTION (It took me all day to figure this out). If javax.faces.PROJECT_STAGE is set to DEVELOPMENT Exception is thrown on marked point (&lt;==[here]):</p> <pre><code>javax.faces.view.facelets.TagException: /resources/components/form/pokus.xhtml @8,19 &lt;cc:interface&gt; Component Not Found for identifier: j_id2.getParent(). at com.sun.faces.facelets.tag.composite.InterfaceHandler.validateComponent(InterfaceHandler.java:135) at com.sun.faces.facelets.tag.composite.InterfaceHandler.apply(InterfaceHandler.java:125) at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98) at com.sun.faces.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:93) at com.sun.faces.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:82) at com.sun.faces.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:152) at cz.boza.formcreator.formcore.Try.setComponentJ(Try.java:83) at cz.boza.formcreator.formcore.FormCreator.&lt;init&gt;(FormCreator.java:40) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:532) </code></pre> <p>It's some problem with parent set in compositeRoot component (j_id2 is automaticaly generated ID of compositeRoot). Also this code is not tested thorougly enough, so I'm not sure if I can rely on it.</p> <p>I think its very important to be able to manipulate Composite Components programmaticaly. Otherwise Composite Components are half useless.</p> <p>Thank you very much.</p>
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    1. COAfter some testing I also found out, that I can't programatically nest any component (add as child) in other composite component :(.
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    2. COOk So I finaly found solution. Here you can download demo ho to programatically create Composite Components. http://confluence.highsource.org/display/Hifaces20/Dynamic+Faces+-+sample+demonstrating+dynamic+or+programmatic+UI+creation+with+JSF+2.0+and+Facelets
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    3. COI tried The link now and It works. It's quiet complicated because it's whole project about programatic creation of composite components and dynamic construction of JSF pages.
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