--- a/o.apache.tools.ant.module/src/org/apache/tools/ant/module/bridge/AntBridge.java	
+++ a/o.apache.tools.ant.module/src/org/apache/tools/ant/module/bridge/AntBridge.java	
@@ -56,8 +56,13 @@ 
 import java.lang.ref.Reference;
 import java.lang.ref.SoftReference;
 import java.lang.reflect.Method;
+import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLClassLoader;
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.charset.CharacterCodingException;
+import java.nio.charset.Charset;
 import java.security.AllPermission;
 import java.security.CodeSource;
 import java.security.PermissionCollection;
@@ -80,6 +85,7 @@ 
 import org.openide.modules.InstalledFileLocator;
 import org.openide.modules.ModuleInfo;
 import org.openide.util.ChangeSupport;
+import org.openide.util.Exceptions;
 import org.openide.util.Lookup;
 import org.openide.util.LookupEvent;
 import org.openide.util.LookupListener;
@@ -573,7 +579,7 @@ 
         }
         
         public AllPermissionURLClassLoader(URL[] urls, ClassLoader parent) {
-            super(urls, parent);
+            super(sanitize(urls), parent);
         }
         
         @Override
@@ -609,6 +615,49 @@ 
                 throw e;
             }
         }
+        
+        private static URL sanitize (URL url) {
+            final String surl = url.toExternalForm();
+            boolean changed = false;
+            final StringBuilder sb = new StringBuilder();
+            final CharBuffer cb = CharBuffer.allocate(1);
+            final Charset cs = Charset.forName("UTF-8");
+            try {
+                for (int i=0; i<surl.length(); i++) {
+                    char c = surl.charAt(i);
+                    if (c <= 127) {
+                        sb.append(c);
+                    } else {                
+                        cb.clear();
+                        cb.put(c);
+                        cb.flip();
+                        ByteBuffer bb = cs.newEncoder().encode(cb);
+                        while (bb.hasRemaining()) {
+                            sb.append('%'); //NOI18N
+                            sb.append(Integer.toHexString(bb.get() & 0xff ));
+                        }                    
+                        changed = true;
+                    }
+                }
+                if (changed) {
+                    url = new URL(sb.toString());
+                }
+            } catch (MalformedURLException e) {
+                Exceptions.printStackTrace(e);
+            } catch (CharacterCodingException e) {
+                Exceptions.printStackTrace(e);
+            }
+            return url;
+        }
+        
+        private static URL[] sanitize (final URL... urls) {
+            for (int i=0; i< urls.length; i++) {
+                urls[i] = sanitize(urls[i]);
+            }
+            return urls;
+        }
+        
+        
 
     }