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https://issues.apache.org/jira/browse/MYFACES-3128?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Juan Fernandez Corugedo resolved MYFACES-3128.
----------------------------------------------
Resolution: Duplicate
Fix Version/s: 2.1.0
2.1.0-SNAPSHOT
https://issues.apache.org/jira/browse/MYFACES-2628
> Problems with a custom Resource Resolver
> ----------------------------------------
>
> Key: MYFACES-3128
> URL: https://issues.apache.org/jira/browse/MYFACES-3128
> Project: MyFaces Core
> Issue Type: Bug
> Affects Versions: 2.0.5
> Environment: GlassFish 3.0 with Oracle JVM 1.6 and Websphere
> 7.0.0.13 with IBM JVM 1.6
> Reporter: Juan Fernandez Corugedo
> Fix For: 2.1.0-SNAPSHOT, 2.1.0
>
> Attachments: mojarra-test.war, myfaces-test.war
>
>
> Hi.
> I'm working in a project with Myfaces 2.0.5 (or 2.1.0) 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
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