--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jpackager/share/classes/jdk/jpackager/internal/Log.java	Mon Nov 05 17:32:00 2018 -0500
@@ -0,0 +1,213 @@
+/*
+ * Copyright (c) 2011, 2018, 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 jdk.jpackager.internal;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+import java.io.PrintWriter;
+
+/**
+ * Log
+ *
+ * General purpose logging mechanism.
+ */
+public class Log {
+    public static class Logger {
+        private boolean verbose = false;
+        private PrintWriter out = null;
+        private PrintWriter err = null;
+
+        public Logger(boolean v) {
+            verbose = v;
+        }
+
+        public void setVerbose(boolean v) {
+            verbose = v;
+        }
+
+        public boolean isVerbose() {
+            return verbose;
+        }
+
+        public void setPrintWriter(PrintWriter out, PrintWriter err) {
+            this.out = out;
+            this.err = err;
+        }
+
+        public void flush() {
+            if (out != null) {
+                out.flush();
+            }
+
+            if (err != null) {
+                err.flush();
+            }
+        }
+
+        public void info(String msg) {
+            if (out != null) {
+                out.println(msg);
+            } else {
+                System.out.println(msg);
+            }
+        }
+
+        public void infof(String format, Object... args) {
+            if (out != null) {
+                out.printf(format, args);
+            } else {
+                System.out.printf(format, args);
+            }
+        }
+
+        public void error(String msg) {
+            if (err != null) {
+                err.println(msg);
+            } else {
+                System.err.println(msg);
+            }
+        }
+
+        public void verbose(Throwable t) {
+            if (out != null && (Log.debug || verbose)) {
+                t.printStackTrace(out);
+            } else if (Log.debug || verbose) {
+                t.printStackTrace(System.out);
+            }
+        }
+
+        public void verbose(String msg) {
+            if (out != null && (Log.debug || verbose)) {
+                out.println(msg);
+            } else if (Log.debug || verbose) {
+                System.out.println(msg);
+            }
+        }
+
+        public void debug(String msg) {
+            if (out != null && Log.debug) {
+                out.println(msg);
+            } else if (Log.debug) {
+                System.out.println(msg);
+            }
+        }
+    }
+
+    private static Logger delegate = null;
+    private static boolean debug =
+            "true".equals(System.getenv("JPACKAGER_DEBUG"));
+
+    public static void setLogger(Logger l) {
+        delegate = l;
+        if (l == null) {
+            delegate = new Logger(false);
+        }
+    }
+
+    public static Logger getLogger() {
+        return delegate;
+    }
+
+    public static void flush() {
+        if (delegate != null) {
+            delegate.flush();
+        }
+    }
+
+    public static void info(String msg) {
+        if (delegate != null) {
+           delegate.info(msg);
+        }
+    }
+
+    public static void infof(String format, Object... args) {
+        if (delegate != null) {
+           delegate.infof(format, args);
+        }
+    }
+
+    public static void error(String msg) {
+        if (delegate != null) {
+            delegate.error(msg);
+        }
+    }
+
+    public static void setVerbose(boolean v) {
+        if (delegate != null) {
+            delegate.setVerbose(v);
+        }
+    }
+
+    public static boolean isVerbose() {
+        if (delegate != null) {
+            return delegate.isVerbose();
+        }
+
+        return false; // Off by default
+    }
+
+    public static void verbose(String msg) {
+        if (delegate != null) {
+           delegate.verbose(msg);
+        }
+    }
+
+    public static void verbose(Throwable t) {
+        if (delegate != null) {
+           delegate.verbose(t);
+        }
+    }
+
+    public static void debug(String msg) {
+        if (delegate != null) {
+           delegate.debug(msg);
+        }
+    }
+
+    public static void debug(RuntimeException re) {
+        debug((Throwable) re);
+    }
+
+    public static void debug(Throwable t) {
+        try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
+            try (PrintStream ps = new PrintStream(baos)) {
+                t.printStackTrace(ps);
+            }
+            debug(baos.toString());
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static boolean isDebug() {
+        return debug;
+    }
+
+    public static void setDebug(boolean debug) {
+        Log.debug = debug;
+    }
+}