Provides a system property that can be used to restore use of
'jar'-protocol URLs for certain JARs, according to a regular
expression. Option #3 (or even #2) of issue #130618.

diff --git a/o.n.bootstrap/src/org/netbeans/JarClassLoader.java b/o.n.bootstrap/src/org/netbeans/JarClassLoader.java
--- a/o.n.bootstrap/src/org/netbeans/JarClassLoader.java
+++ b/o.n.bootstrap/src/org/netbeans/JarClassLoader.java
@@ -76,6 +76,7 @@
 import java.util.jar.Manifest;
 import java.util.logging.Level;
 import java.util.logging.Logger;
+import java.util.regex.Pattern;
 import java.util.zip.ZipEntry;
 
 /**
@@ -346,6 +347,17 @@
     }
 
     static class JarSource extends Source {
+
+        private static final Pattern PLAIN_JAR_PROTOCOL;
+        static {
+            Pattern p = null;
+            String prop = System.getProperty("org.netbeans.JarClassLoader.PLAIN_JAR_PROTOCOL");
+            if (prop != null) {
+                p = Pattern.compile(prop);
+            }
+            PLAIN_JAR_PROTOCOL = p;
+        }
+
         private String resPrefix;
         private File file;
 
@@ -356,7 +368,11 @@
         
         JarSource(File file) throws IOException {
             super(file.toURL());
-            resPrefix = ResURLStreamHandler.RES_PROTO +":" + file.toURI() + "!/"; // NOI18N;
+            if (PLAIN_JAR_PROTOCOL != null && PLAIN_JAR_PROTOCOL.matcher(file.getAbsolutePath()).matches()) {
+                resPrefix = "jar:" + file.toURI() + "!/"; // NOI18N
+            } else {
+                resPrefix = ResURLStreamHandler.RES_PROTO + ":" + file.toURI() + "!/"; // NOI18N;
+            }
             this.file = file;
         }