Fix https://github.com/jruby/jruby/issues/1220

fix-uris.diff

diff --git a/core/src/main/java/org/jruby/runtime/load/LoadService.java b/core/src/main/java/org/jruby/runtime/load/LoadService.java
index 4f457be..5d1ce7d 100644
--- a/core/src/main/java/org/jruby/runtime/load/LoadService.java
+++ b/core/src/main/java/org/jruby/runtime/load/LoadService.java
@@ -1392,23 +1392,23 @@ public class LoadService {
     }
     
     private String[] splitJarUrl(String loadPathEntry) {
-        int idx = loadPathEntry.indexOf("!");
-        if (idx == -1) {
-            return new String[]{loadPathEntry, ""};
-        }
-
-        String filename = loadPathEntry.substring(0, idx);
-        String entry = idx + 2 < loadPathEntry.length() ? loadPathEntry.substring(idx + 2) : "";
-
-        if(filename.startsWith("jar:")) {
-            filename = filename.substring(4);
-        }
-        
-        if(filename.startsWith("file:")) {
-            filename = filename.substring(5);
-        }
-        
-        return new String[]{filename, entry};
+		String[] components = loadPathEntry.split("!", 2);
+		if (components.length != 2) {
+			components = new String[]{components[0], ""};
+		}
+    	try {
+        	URI jarURI = new URI(components[0]);
+        	if (jarURI.getScheme() == "file" || jarURI.getScheme() == "jar") {
+        		// decode the file or jar URI appropriately
+        		components[0] = jarURI.getSchemeSpecificPart();
+        	}
+    	} catch (URISyntaxException ex) {
+    		// not a URI
+    	}
+		if (components[1].length() == 1) {
+			components[1] = "";
+		}
+		return components;
     }
 
     protected LoadServiceResource tryResourceFromLoadPath( String namePlusSuffix,String loadPathEntry) throws RaiseException {