fixed an infinite recursion caused by the getResources method of Sour…

…ceLocationClassLoader. This method would only be called by the plugin mechanism of Selenium when activated from the rascal tutor command executor wrapper for taking snapshots during documentation generation

src/org/rascalmpl/uri/classloaders/SourceLocationClassLoader.java

@@ -160,10 +160,23 @@ public URL getResource(String name) {
     public Enumeration<URL> getResources(String name) throws IOException {
         List<URL> result = new ArrayList<>(path.size());
 
+
         for (ClassLoader l : path) {
-            Enumeration<URL> e = l.getResources(name);
-            while (e.hasMoreElements()) {
-                result.add(e.nextElement());
+            SearchItem item = new SearchItem(l, name);
+
+            if (stack.contains(item)) {
+                continue;
+            }
+            try {
+                stack.push(item);
+
+                Enumeration<URL> e = l.getResources(name);
+                while (e.hasMoreElements()) {
+                    result.add(e.nextElement());
+                }
+            }
+            finally {
+                stack.pop();
             }
         }