Another fix for (broken) Windows

jpype/_core.py

@@ -324,10 +324,11 @@ def startJVM(
 
         # ok, setup the jpype system classloader and add to the path after startup
         # this guarentees all classes have the same permissions as they did in the past
+        from urllib.parse import quote
         extra_jvm_args += [
             '-Djava.system.class.loader=org.jpype.JPypeClassLoader',
             '-Djava.class.path=%s'%support_lib,
-            '-Djpype.class.path=%s'%classpath,
+            '-Djpype.class.path=%s'%quote(classpath),
             '-Xshare:off'
         ]
     else:

native/java/org/jpype/JPypeClassLoader.java

@@ -5,6 +5,7 @@
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.UnsupportedEncodingException;
 import java.net.MalformedURLException;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -26,6 +27,9 @@
 import java.util.Set;
 import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
+import java.net.URLDecoder;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 public class JPypeClassLoader extends URLClassLoader
 {
@@ -57,6 +61,14 @@ private static URL[] initial()
     String cp = System.getProperty("jpype.class.path");
     if (cp == null)
       return new URL[0];
+
+    try
+    {
+      cp =  URLDecoder.decode(cp, "UTF-8");
+    } catch (UnsupportedEncodingException ex)
+    {
+      // ignored
+    }
 
     ArrayList<URL> path = new ArrayList<>();
     int last = 0;