/**
   * Look for jars in WEB-INF/lib
   *
   * @param context
   * @return the list of jar resources found within context
   * @throws Exception
   */
  protected List<Resource> findJars(WebAppContext context) throws Exception {
    List<Resource> jarResources = new ArrayList<Resource>();

    Resource web_inf = context.getWebInf();
    if (web_inf == null || !web_inf.exists()) return null;

    Resource web_inf_lib = web_inf.addPath("/lib");

    if (web_inf_lib.exists() && web_inf_lib.isDirectory()) {
      String[] files = web_inf_lib.list();
      for (int f = 0; files != null && f < files.length; f++) {
        try {
          Resource file = web_inf_lib.addPath(files[f]);
          String fnlc = file.getName().toLowerCase(Locale.ENGLISH);
          int dot = fnlc.lastIndexOf('.');
          String extension = (dot < 0 ? null : fnlc.substring(dot));
          if (extension != null && (extension.equals(".jar") || extension.equals(".zip"))) {
            jarResources.add(file);
          }
        } catch (Exception ex) {
          LOG.warn(Log.EXCEPTION, ex);
        }
      }
    }
    return jarResources;
  }
 public File findWorkDirectory(WebAppContext context) throws IOException {
   if (context.getBaseResource() != null) {
     Resource web_inf = context.getWebInf();
     if (web_inf != null && web_inf.exists()) {
       return new File(web_inf.getFile(), "work");
     }
   }
   return null;
 }
  @Override
  public void configure(WebAppContext context) throws Exception {
    // cannot configure if the context is already started
    if (context.isStarted()) {
      if (LOG.isDebugEnabled())
        LOG.debug("Cannot configure webapp " + context + " after it is started");
      return;
    }

    Resource web_inf = context.getWebInf();

    // Add WEB-INF classes and lib classpaths
    if (web_inf != null
        && web_inf.isDirectory()
        && context.getClassLoader() instanceof WebAppClassLoader) {
      // Look for classes directory
      Resource classes = web_inf.addPath("classes/");
      if (classes.exists()) ((WebAppClassLoader) context.getClassLoader()).addClassPath(classes);

      // Look for jars
      Resource lib = web_inf.addPath("lib/");
      if (lib.exists() || lib.isDirectory())
        ((WebAppClassLoader) context.getClassLoader()).addJars(lib);
    }

    // Look for extra resource
    @SuppressWarnings("unchecked")
    List<Resource> resources = (List<Resource>) context.getAttribute(RESOURCE_URLS);
    if (resources != null) {
      Resource[] collection = new Resource[resources.size() + 1];
      int i = 0;
      collection[i++] = context.getBaseResource();
      for (Resource resource : resources) collection[i++] = resource;
      context.setBaseResource(new ResourceCollection(collection));
    }
  }