Facelets Classloading Takes Much Longer when jsf-facelets.jar is Deployed in a Common Location ---------------------------------------------------------------------------------------------- Key: JBSEAM-4732 URL: https://issues.jboss.org/browse/JBSEAM-4732 Project: Seam 2 Issue Type: Bug Reporter: Gary Hu Assignee: Marek Novotny Attachments: facelets-1.1.15.B1.patch The facelets 1.1.15.B1 is placed under the $JBOSS_HOME/server/$PROFILE/lib folder. In EAP 4.3, it takes about 2s to load the facelets library, but in EAP 5.0 it takes about 15s. The following facelets code is analyzed, which tells us the slowness comes from the facelets library loading: public static URL[] search(ClassLoader cl, String prefix, String suffix) throws IOException { Enumeration[] e = new Enumeration[] { cl.getResources(prefix), cl.getResources(prefix + "MANIFEST.MF") }; Set all = new LinkedHashSet(); URL url; URLConnection conn; JarFile jarFile; for (int i = 0, s = e.length; i < s; ++i) { while (e[i].hasMoreElements()) { url = (URL) e[i].nextElement(); conn = url.openConnection(); conn.setUseCaches(false); conn.setDefaultUseCaches(false); if (conn instanceof JarURLConnection) { jarFile = ((JarURLConnection) conn).getJarFile(); } else { jarFile = getAlternativeJarFile(url); } if (jarFile != null) { searchJar(cl, all, jarFile, prefix, suffix); } else { boolean searchDone = searchDir(all, new File(URLDecoder.decode(url.getFile(), "UTF-8")), suffix); if (!searchDone) { searchFromURL(all, prefix, suffix, url); } } } } URL[] urlArray = (URL[]) all.toArray(new URL[all.size()]); return urlArray; } This method is called from com.sun.facelets.compiler.TagLibraryConfig.loadImplicit() with the followign statement: ClassLoader cl = Thread.currentThread().getContextClassLoader(); URL[] urls = Classpath.search(cl, "META-INF/", SUFFIX); //SUFFIX is ".taglib.xml"