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    <p>ok, I found how to do it with MyFaces. It also requires a bit of ugly reflection...</p> <pre><code>public static UIComponent instantiateTagComponent(Location loc, String namespace, String localPrefix, String componentName, TagComponentParam params[]) { final String ERROR_MESSAGE = "Erreur lors de l'instanciation d'un tag component"; FacesContext ctx = FacesContext.getCurrentInstance(); AbstractFaceletContext fctx = (AbstractFaceletContext) ctx.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY); fctx.pushPageContext(new PageContextImpl()); FaceletViewDeclarationLanguage vdl = new FaceletViewDeclarationLanguage(ctx); UIPanel panel = (UIPanel) ctx.getApplication().createComponent( UIPanel.COMPONENT_TYPE ); try { Method createCompiler = FaceletViewDeclarationLanguage.class.getDeclaredMethod("createCompiler",FacesContext.class); Method 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, ctx); FaceletFactory ff = (FaceletFactory) createFaceletFactory.invoke(vdl, ctx, compiler); TagLibrary tl = compiler.createTagLibrary(); TagConfig tc = new JSFUtilsTagUnit(tl, namespace, localPrefix, componentName,params,loc); TagHandler th = tl.createTagHandler(namespace, componentName, tc); Field declaredField = FaceletCompositionContext.class.getDeclaredField("FACELET_COMPOSITION_CONTEXT_KEY"); declaredField.setAccessible(true); FaceletCompositionContextImpl faceletCompositionContextImpl = new FaceletCompositionContextImpl(ff,ctx); Class&lt;?&gt; dfcClass = Class.forName("org.apache.myfaces.view.facelets.impl.DefaultFaceletContext"); Field fMCTX = dfcClass.getDeclaredField("_mctx"); fMCTX.setAccessible(true); fMCTX.set(fctx, faceletCompositionContextImpl); FacesContext.getCurrentInstance().getAttributes().put((String)declaredField.get(null),faceletCompositionContextImpl); FaceletCompositionContext mctx = (FaceletCompositionContext) FaceletCompositionContext.getCurrentInstance(fctx); mctx.startComponentUniqueIdSection(); th.apply( fctx, panel ); } catch (IOException ex) { log.error(ERROR_MESSAGE, ex); } catch (InvocationTargetException ex) { log.error(ERROR_MESSAGE, ex); } catch (NoSuchMethodException ex) { log.error(ERROR_MESSAGE, ex); } catch (NoSuchFieldException ex) { log.error(ERROR_MESSAGE, ex); } catch (SecurityException ex) { log.error(ERROR_MESSAGE, ex); } catch (ClassNotFoundException ex) { log.error(ERROR_MESSAGE, ex); } catch (IllegalArgumentException ex) { log.error(ERROR_MESSAGE, ex); } catch (IllegalAccessException ex) { log.error(ERROR_MESSAGE, ex); } finally { fctx.popPageContext(); } return panel; } </code></pre> <p>The JSFUtilsTagUnit class is :</p> <pre><code>static class JSFUtilsTagUnit implements TagConfig { private final TagLibrary library; private final String namespace; private final String name; private Tag tag; public JSFUtilsTagUnit(TagLibrary library, String namespace, String localPrefix, String name, TagComponentParam params[], Location loc) { this.library = library; this.namespace = namespace; this.name = name; if(loc == null) { loc = new Location("virtual", -1, -1); } TagAttribute[] tas; if((params != null) &amp;&amp; (params.length &gt; 0)) { tas = new TagAttribute[params.length]; int iCurrent = 0; for(TagComponentParam tcpCur : params) { tas[iCurrent] = new TagAttributeImpl(loc,"",tcpCur.getName(), tcpCur.getName(), tcpCur.getValue()); iCurrent++; } } else { tas = new TagAttribute[0]; } TagAttributes tattrs = new TagAttributesImpl(tas); tag = new Tag(loc, namespace, name, localPrefix+":"+name, tattrs); } public FaceletHandler getNextHandler() { return new FaceletHandler() { public void apply(FaceletContext ctx, UIComponent parent) throws IOException { } }; } public Tag getTag() { return tag; } public String getTagId() { return "-1"; } } </code></pre> <p>Hope it will help someone else !</p>
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