diff --git a/platform/util/src/com/intellij/util/lang/ClassPath.java b/platform/util/src/com/intellij/util/lang/ClassPath.java
index 5ca37f0b8f8b..21510b2f4b25 100644
--- a/platform/util/src/com/intellij/util/lang/ClassPath.java
+++ b/platform/util/src/com/intellij/util/lang/ClassPath.java
@@ -50,7 +50,7 @@ class ClassPath {
   private static final long NS_THRESHOLD = 10000000L;
 
   private static PrintStream ourOrder;
-  private volatile boolean myAcceptUnescapedUrls;
+  private final boolean myAcceptUnescapedUrls;
 
   @SuppressWarnings({"UnusedDeclaration"})
   private static void printOrder(Loader loader, String resource) {
@@ -79,8 +79,13 @@ class ClassPath {
   }
 
   public ClassPath(URL[] urls, boolean canLockJars, boolean canUseCache) {
+    this(urls, canLockJars, canUseCache, false);
+  }
+
+  public ClassPath(URL[] urls, boolean canLockJars, boolean canUseCache, boolean acceptUnescapedUrls) {
     myCanLockJars = canLockJars;
     myCanUseCache = canUseCache;
+    myAcceptUnescapedUrls = acceptUnescapedUrls;
     push(urls);
   }
 
@@ -205,10 +210,6 @@ class ClassPath {
     }
   }
 
-  public void setAcceptUnescapedUrls(boolean acceptUnescapedUrls) {
-    myAcceptUnescapedUrls = acceptUnescapedUrls;
-  }
-
   private class MyEnumeration implements Enumeration<URL> {
     private int myIndex = 0;
     private Resource myRes = null;
diff --git a/platform/util/src/com/intellij/util/lang/UrlClassLoader.java b/platform/util/src/com/intellij/util/lang/UrlClassLoader.java
index 5348d0ca526d..b04ebc301b17 100644
--- a/platform/util/src/com/intellij/util/lang/UrlClassLoader.java
+++ b/platform/util/src/com/intellij/util/lang/UrlClassLoader.java
@@ -46,6 +46,10 @@ public class UrlClassLoader extends ClassLoader {
   }
 
   public UrlClassLoader(List<URL> urls, ClassLoader parent, boolean canLockJars, boolean canUseCache) {
+    this(urls, parent, canLockJars, canUseCache, false);
+  }
+
+  public UrlClassLoader(List<URL> urls, ClassLoader parent, boolean canLockJars, boolean canUseCache, boolean acceptUnescapedUrls) {
     super(parent);
 
     myClassPath = new ClassPath(urls.toArray(new URL[urls.size()]), canLockJars, canUseCache);
@@ -57,10 +61,6 @@ public class UrlClassLoader extends ClassLoader {
     myURLs.add(url);
   }
 
-  public void setAcceptUnescapedUrls(boolean acceptUnescapedUrls) {
-    myClassPath.setAcceptUnescapedUrls(acceptUnescapedUrls);
-  }
-
   public List<URL> getUrls() {
     return Collections.unmodifiableList(myURLs);
   }
diff --git a/plugins/ant/src/com/intellij/lang/ant/config/impl/AntInstallation.java b/plugins/ant/src/com/intellij/lang/ant/config/impl/AntInstallation.java
index 0084444e6b92..d748495ef6e5 100644
--- a/plugins/ant/src/com/intellij/lang/ant/config/impl/AntInstallation.java
+++ b/plugins/ant/src/com/intellij/lang/ant/config/impl/AntInstallation.java
@@ -164,7 +164,7 @@ public class AntInstallation {
     Properties properties = new Properties();
     InputStream stream = null;
     try {
-      stream = new UrlClassLoader(Collections.singletonList(antJar.toURL()), null).getResourceAsStream(VERSION_RESOURCE);
+      stream = new UrlClassLoader(Collections.singletonList(antJar.toURL()), null, false, false, true).getResourceAsStream(VERSION_RESOURCE);
       properties.load(stream);
     }
     catch (MalformedURLException e) {
diff --git a/plugins/ant/src/com/intellij/lang/ant/config/impl/AntResourcesClassLoader.java b/plugins/ant/src/com/intellij/lang/ant/config/impl/AntResourcesClassLoader.java
index 756583658818..4ff2b85c8b2a 100644
--- a/plugins/ant/src/com/intellij/lang/ant/config/impl/AntResourcesClassLoader.java
+++ b/plugins/ant/src/com/intellij/lang/ant/config/impl/AntResourcesClassLoader.java
@@ -31,7 +31,7 @@ public class AntResourcesClassLoader extends UrlClassLoader {
   private final Set<String> myMisses = new HashSet<String>();
 
   public AntResourcesClassLoader(final List<URL> urls, final ClassLoader parentLoader, final boolean canLockJars, final boolean canUseCache) {
-    super(urls, parentLoader, canLockJars, canUseCache);
+    super(urls, parentLoader, canLockJars, canUseCache, true);
   }
 
   protected Class<?> loadClass(final String name, final boolean resolve) throws ClassNotFoundException {
diff --git a/plugins/ant/src/com/intellij/lang/ant/dom/CustomAntElementsRegistry.java b/plugins/ant/src/com/intellij/lang/ant/dom/CustomAntElementsRegistry.java
index a1759abe83be..99d175981a5d 100644
--- a/plugins/ant/src/com/intellij/lang/ant/dom/CustomAntElementsRegistry.java
+++ b/plugins/ant/src/com/intellij/lang/ant/dom/CustomAntElementsRegistry.java
@@ -310,9 +310,7 @@ public class CustomAntElementsRegistry {
     if (urls.size() == 0) {
       return parentLoader;
     }
-    final AntResourcesClassLoader loader = new AntResourcesClassLoader(urls, parentLoader, false, false);
-    loader.setAcceptUnescapedUrls(true);
-    return loader;
+    return new AntResourcesClassLoader(urls, parentLoader, false, false);
   }
 
   public static List<URL> collectUrls(AntDomClasspathElement typedef) {
diff --git a/plugins/ant/src/com/intellij/lang/ant/psi/impl/AntTypeDefImpl.java b/plugins/ant/src/com/intellij/lang/ant/psi/impl/AntTypeDefImpl.java
index 7be5b5c7a06b..75f63fb3160b 100644
--- a/plugins/ant/src/com/intellij/lang/ant/psi/impl/AntTypeDefImpl.java
+++ b/plugins/ant/src/com/intellij/lang/ant/psi/impl/AntTypeDefImpl.java
@@ -587,7 +587,6 @@ public class AntTypeDefImpl extends AntTaskImpl implements AntTypeDef {
     }
     
     final AntResourcesClassLoader loader = new AntResourcesClassLoader(urls, parentLoader, false, false);
-    loader.setAcceptUnescapedUrls(true);
     LOADERS_CACHE.setClassLoader(urls, loader);
     return loader;
   }