--- a/langtools/src/jdk.javadoc/share/classes/com/sun/tools/doclets/internal/toolkit/util/StandardDocFileFactory.java	Tue Mar 15 13:48:30 2016 -0700
+++ b/langtools/src/jdk.javadoc/share/classes/com/sun/tools/doclets/internal/toolkit/util/StandardDocFileFactory.java	Thu Mar 17 19:04:28 2016 +0000
@@ -105,12 +105,12 @@
 
     @Override
     Iterable<DocFile> list(Location location, DocPath path) {
-        if (location != StandardLocation.SOURCE_PATH)
-            throw new IllegalArgumentException();
+        Location l = ((location == StandardLocation.SOURCE_PATH)
+                && !fileManager.hasLocation(StandardLocation.SOURCE_PATH))
+                ? StandardLocation.CLASS_PATH
+                : location;
 
         Set<DocFile> files = new LinkedHashSet<>();
-        Location l = fileManager.hasLocation(StandardLocation.SOURCE_PATH)
-                ? StandardLocation.SOURCE_PATH : StandardLocation.CLASS_PATH;
         for (Path f: fileManager.getLocationAsPaths(l)) {
             if (Files.isDirectory(f)) {
                 f = f.resolve(path.getPath());