使用 JSF 2 / MyFaces 的 Seam Mail答案

【问题标题】：Seam Mail with JSF 2 / MyFaces使用 JSF 2 / MyFaces 的 Seam Mail
【发布时间】：2013-12-05 17:52:09
【问题描述】：

是否有人使用 JSF 的 MyFaces 2.1.x 实现来运行带有 JSF 2 的 Seam Mail (Seam 2.3)？

我无法让 Seam Mail 工作，因为无法创建 Seam 的 org.jboss.seam.faces.renderer 组件。它对com.sun.faces.facelets.Facelet 有一个类依赖，而这个类在 MyFaces 中不存在。

@Scope(ScopeType.STATELESS)
@BypassInterceptors
@Name("org.jboss.seam.faces.renderer")
@AutoCreate
@Install(value = true, precedence = Install.BUILT_IN,
  classDependencies = "com.sun.faces.facelets.Facelet")
public class FaceletsRenderer extends Renderer {
    ...
}

因此，以下语句失败并出现“@In 属性需要非空值”异常。

@In(create = true)
private Renderer renderer;

我能做什么？我还应该从 Mojarra 实现中添加 jsf-api 吗？！

干杯弗兰克

【问题讨论】：

标签： jsf-2 myfaces seam2

【解决方案1】：

好的，我修好了！

我刚刚用我自己的组件替换了有问题的 Seam FaceletsRenderer：

@Scope(ScopeType.STATELESS)
@BypassInterceptors
@Name("org.jboss.seam.faces.renderer")
@AutoCreate
@Install(value = true, precedence = Install.APPLICATION)
// dependency to the evil Sun JSF class is removed:
// , classDependencies = "com.sun.faces.facelets.Facelet")
public class FaceletsRenderer extends Renderer {

    /**
     * Render the viewId, anything written to the JSF ResponseWriter is returned
     */
    @Override
    public String render(final String viewId) {
        // call our fixed RendererRequest class instead of the original one.
        de.jw.filesio.webapp.renderer.RendererRequest rendererRequest = new de.jw.filesio.webapp.renderer.RendererRequest(
                viewId);
        try {
            rendererRequest.run();
        } catch (IOException e) {
            throw new RuntimeException("error rendering " + viewId, e);
        }
        return rendererRequest.getOutput();
    }

}

原来Seam-Ui 中的RendererRequest 类与Sun JSF 耦合得很好，所以你也必须替换它。只需修复方法faceletForViewId(String)。给你：

    /**
     * Get a Facelet for a URL
     */
    protected Facelet faceletForViewId(String viewId) throws IOException {
        URL url = ResourceLoader.instance().getResource(viewId);
        if (url == null) {
            throw new IllegalArgumentException("resource doesn't exist: " + viewId);
        }

        // OLD CODE tightly coupled to Sun JSF
        // return
        // ApplicationAssociate.getCurrentInstance().getFaceletFactory().getFacelet(url);

        // NEW CODE for MyFaces
        // see
        // http://stackoverflow.com/questions/15813582/how-to-programmatically-instantiate-a-composite-component-or-a-tag-component
        FaceletFactory ff = DefaultFaceletFactory.getInstance();
        if (ff == null) {
            FaceletViewDeclarationLanguage vdl = new FaceletViewDeclarationLanguage(facesContext);

            Method createCompiler = null;
            Method createFaceletFactory = null;
            try {
                createCompiler = FaceletViewDeclarationLanguage.class.getDeclaredMethod("createCompiler",
                        FacesContext.class);
                createFaceletFactory = FaceletViewDeclarationLanguage.class.getDeclaredMethod("createFaceletFactory",
                        FacesContext.class, org.apache.myfaces.view.facelets.compiler.Compiler.class);
                createCompiler.setAccessible(true);
                createFaceletFactory.setAccessible(true);
                org.apache.myfaces.view.facelets.compiler.Compiler compiler = (org.apache.myfaces.view.facelets.compiler.Compiler) createCompiler
                        .invoke(vdl, facesContext);
                ff = (FaceletFactory) createFaceletFactory.invoke(vdl, facesContext, compiler);
            } catch (Exception ex) {
                log.error("Error creating FaceletFactory.", ex);
            }

        }

        Facelet facelet = null;
        try {

            facelet = ff.getFacelet(url);

        } catch (Exception ex) {
            log.error("Error creating facelet for url " + url, ex);
        }

        log.debug("Successfully created facelet for " + url + ": " + facelet);

        return facelet;
    }

我希望这可以帮助其他人解决我的问题。

【讨论】：