Hi, This seems to be an implementation issue of MyFaces. Please file a ticket in our JIRA at https://issues.apache.org/jira/browse/MYFACES
Thanks! Regards, Jakob 2011/5/6 Juan Fernandez-Corugedo Igual <[email protected]>: > > Hi. > > I'm working in a project with Myfaces 2.0.5 and I have had a problem with a > custom ResourceResolver. > > I have coded a ResourceResolver that dynamically builds an XHTML file when > the engine asks him to resolve a certain URL. > > To achieve this, I have update the web.xml as follows: > > <context-param> > <param-name>javax.faces.FACELETS_VIEW_MAPPINGS</param-name> > <param-value>*.test;*.xhtml</param-value> > </context-param> > > <context-param> > <param-name>javax.faces.FACELETS_RESOURCE_RESOLVER</param-name> > > <param-value>com.test.view.facelets.CustomResourceResolver</param-value> > </context-param> > > My CustomResourceResolver is very simple: > > package com.test.view.facelets; > > import java.io.ByteArrayInputStream; > import java.io.IOException; > import java.io.InputStream; > import java.net.MalformedURLException; > import java.net.URL; > import java.net.URLConnection; > import java.net.URLStreamHandler; > > import javax.faces.view.facelets.ResourceResolver; > > public class CustomResourceResolver extends ResourceResolver { > > private ResourceResolver innerResourceResolver; > > private String viewSource = ".... xhtml of the test page ...."; > > public CustomResourceResolver(ResourceResolver resourceResolver){ > this.innerResourceResolver = resourceResolver; > } > > @Override > public URL resolveUrl(String path) { > System.out.println("Buscando la URL del recurso: " + path); > URL result = null; > > if(path.endsWith(".test")){ > try{ > result = getUrlForResourceAsStream(path); > }catch(Exception e){ > System.out.println("Unexpected error while obtaining the URL > from resource " + path); > e.printStackTrace(System.out); > } > > }else{ > result = this.innerResourceResolver.resolveUrl(path); > } > > return result; > } > > private URL getUrlForResourceAsStream(String path) throws > MalformedURLException { > URLStreamHandler handler = new URLStreamHandler() { > protected URLConnection openConnection(URL u) throws IOException > { > final String file = u.getFile(); > return new URLConnection(u) { > public void connect() throws IOException { > } > > public InputStream getInputStream() throws IOException { > System.out.println("Opening internal url to " + > file); > > try{ > System.out.println("Generando el InputStream de > la pagina:\n" + viewSource); > return new > ByteArrayInputStream(viewSource.getBytes("UTF-8")); > }catch (Exception e) { > e.printStackTrace(); > throw new RuntimeException("Unexpected error > while obtaining the view", e); > } > } > }; > } > }; > return new URL("internal", null, 0, path, handler); > } > } > > > As you can see, the code is very simple. When the suffix matches the pattern > ".test", the Resolver creates a mock URL with a backing > ByteArrayInputStream. If the suffix does not matches the pattern, the normal > ResourceResolver is invoked. > > With this configuration and code, when I request the URL: > http://xxxxxx:yyyy/zzzzz/anything.test the application fails with error: > > The problem is this: > > java.lang.NullPointerException > at java.lang.StringBuilder.<init>(StringBuilder.java:92) > at > org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.getRenderedViewId(FaceletViewDeclarationLanguage.java:1630) > at > org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.buildView(FaceletViewDeclarationLanguage.java:279) > .... > > The executes the viewHandler.createView("xxxx.test") method. It internally > calls the getViewHandlerSupport().calculateViewId(context, viewId); method > to obtain the viewId, and this method calls > DefaultViewHandlerSupport.checkResourceExists(FacesContext context, String > viewId), that checks the physical file of this resource, but there are not > any file for this resource!!!! so it return false, and the viewId of the > resulting ViewRoot is assigned to null. > > This causes a NullPointerException later, when the code executes the > ViewDeclarationLanguage.buildView(FacesContext context, ViewRoot viewRoot). > > If I change the Myfaces implementation with Mojarra 2.0.4, it works > perfectly, so I think that the problem is in the implementation. > > I can't extend any class of interface of Myfaces, because my application > must not be coupled to a specific implementation. > > I have attached two web projects, one with Myfaces configuration, that > fails, and the same project with Mojarra configuration, that works (Both > without the jars of the implementation) > > How can I solve this? > > Thanks > > -- Jakob Korherr blog: http://www.jakobk.com twitter: http://twitter.com/jakobkorherr work: http://www.irian.at
