diff -r 000000000000 -r c880a8a8803b rt/emul/compact/src/main/java/java/lang/invoke/ProxyClassesDumper.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/emul/compact/src/main/java/java/lang/invoke/ProxyClassesDumper.java	Sat Aug 09 11:11:13 2014 +0200
@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package java.lang.invoke;
+
+import sun.util.logging.PlatformLogger;
+
+import java.io.FilePermission;
+import java.nio.file.Files;
+import java.nio.file.InvalidPathException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.Objects;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * Helper class used by InnerClassLambdaMetafactory to log generated classes
+ *
+ * @implNote
+ * <p> Because this class is called by LambdaMetafactory, make use
+ * of lambda lead to recursive calls cause stack overflow.
+ */
+final class ProxyClassesDumper {
+    private static final char[] HEX = {
+        '0', '1', '2', '3', '4', '5', '6', '7',
+        '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
+    };
+    private static final char[] BAD_CHARS = {
+        '\\', ':', '*', '?', '"', '<', '>', '|'
+    };
+    private static final String[] REPLACEMENT = {
+        "%5C", "%3A", "%2A", "%3F", "%22", "%3C", "%3E", "%7C"
+    };
+
+    private final Path dumpDir;
+
+    public static ProxyClassesDumper getInstance(String path) {
+        if (null == path) {
+            return null;
+        }
+        try {
+            path = path.trim();
+            final Path dir = Paths.get(path.length() == 0 ? "." : path);
+            AccessController.doPrivileged(new PrivilegedAction<Void>() {
+                    @Override
+                    public Void run() {
+                        validateDumpDir(dir);
+                        return null;
+                    }
+                }, null, new FilePermission("<<ALL FILES>>", "read, write"));
+            return new ProxyClassesDumper(dir);
+        } catch (InvalidPathException ex) {
+            PlatformLogger.getLogger(ProxyClassesDumper.class.getName())
+                          .warning("Path " + path + " is not valid - dumping disabled", ex);
+        } catch (IllegalArgumentException iae) {
+            PlatformLogger.getLogger(ProxyClassesDumper.class.getName())
+                          .warning(iae.getMessage() + " - dumping disabled");
+        }
+        return null;
+    }
+
+    private ProxyClassesDumper(Path path) {
+        dumpDir = Objects.requireNonNull(path);
+    }
+
+    private static void validateDumpDir(Path path) {
+        if (!Files.exists(path)) {
+            throw new IllegalArgumentException("Directory " + path + " does not exist");
+        } else if (!Files.isDirectory(path)) {
+            throw new IllegalArgumentException("Path " + path + " is not a directory");
+        } else if (!Files.isWritable(path)) {
+            throw new IllegalArgumentException("Directory " + path + " is not writable");
+        }
+    }
+
+    public static String encodeForFilename(String className) {
+        final int len = className.length();
+        StringBuilder sb = new StringBuilder(len);
+
+        for (int i = 0; i < len; i++) {
+            char c = className.charAt(i);
+            // control characters
+            if (c <= 31) {
+                sb.append('%');
+                sb.append(HEX[c >> 4 & 0x0F]);
+                sb.append(HEX[c & 0x0F]);
+            } else {
+                int j = 0;
+                for (; j < BAD_CHARS.length; j++) {
+                    if (c == BAD_CHARS[j]) {
+                        sb.append(REPLACEMENT[j]);
+                        break;
+                    }
+                }
+                if (j >= BAD_CHARS.length) {
+                    sb.append(c);
+                }
+            }
+        }
+
+        return sb.toString();
+    }
+
+    public void dumpClass(String className, final byte[] classBytes) {
+        Path file;
+        try {
+            file = dumpDir.resolve(encodeForFilename(className) + ".class");
+        } catch (InvalidPathException ex) {
+            PlatformLogger.getLogger(ProxyClassesDumper.class.getName())
+                          .warning("Invalid path for class " + className);
+            return;
+        }
+
+        try {
+            Path dir = file.getParent();
+            Files.createDirectories(dir);
+            Files.write(file, classBytes);
+        } catch (Exception ignore) {
+            PlatformLogger.getLogger(ProxyClassesDumper.class.getName())
+                          .warning("Exception writing to path at " + file.toString());
+            // simply don't care if this operation failed
+        }
+    }
+}