diff --git a/src/main/java/com/github/shadowsocks/GuardedProcess.java b/src/main/java/com/github/shadowsocks/GuardedProcess.java
deleted file mode 100644
index 2323e719..00000000
--- a/src/main/java/com/github/shadowsocks/GuardedProcess.java
+++ /dev/null
@@ -1,145 +0,0 @@
-/*
- * Shadowsocks - A shadowsocks client for Android
- * Copyright (C) 2015 <max.c.lv@gmail.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program 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 for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- *
- *                            ___====-_  _-====___
- *                      _--^^^#####//      \\#####^^^--_
- *                   _-^##########// (    ) \\##########^-_
- *                  -############//  |\^^/|  \\############-
- *                _/############//   (@::@)   \\############\_
- *               /#############((     \\//     ))#############\
- *              -###############\\    (oo)    //###############-
- *             -#################\\  / VV \  //#################-
- *            -###################\\/      \//###################-
- *           _#/|##########/\######(   /\   )######/\##########|\#_
- *           |/ |#/\#/\#/\/  \#/\##\  |  |  /##/\#/  \/\#/\#/\#| \|
- *           `  |/  V  V  `   V  \#\| |  | |/#/  V   '  V  V  \|  '
- *              `   `  `      `   / | |  | | \   '      '  '   '
- *                               (  | |  | |  )
- *                              __\ | |  | | /__
- *                             (vvv(VVV)(VVV)vvv)
- *
- *                              HERE BE DRAGONS
- *
- */
-
-package com.github.shadowsocks;
-
-import android.util.Log;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.lang.System;
-import java.util.Arrays;
-import java.util.List;
-import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.atomic.AtomicReference;
-
-public class GuardedProcess extends Process {
-    private static final String TAG = GuardedProcess.class.getSimpleName();
-    private final Thread guardThread;
-    private volatile boolean isDestroyed = false;
-    private volatile Process process = null;
-
-    public GuardedProcess(String... cmd) throws InterruptedException, IOException {
-        this(Arrays.asList(cmd));
-    }
-
-    public GuardedProcess(final List<String> cmd) throws InterruptedException, IOException {
-        this(cmd, null);
-    }
-
-    public GuardedProcess(final List<String> cmd, final Runnable onRestartCallback) throws InterruptedException, IOException {
-        final CountDownLatch countDownLatch = new CountDownLatch(1);
-        final AtomicReference<IOException> atomicIoException = new AtomicReference<IOException>(null);
-        guardThread = new Thread(new Runnable() {
-            @Override
-            public void run() {
-                try {
-                    while (!isDestroyed) {
-                        Log.i(TAG, "start process: " + cmd);
-                        long startTime = System.currentTimeMillis();
-                        process = startProcess(cmd);
-                        if (onRestartCallback != null && countDownLatch.getCount() <= 0) {
-                            onRestartCallback.run();
-                        }
-                        countDownLatch.countDown();
-                        process.waitFor();
-                        if (System.currentTimeMillis() - startTime < 1000) {
-                            Log.w(TAG, "process exit too fast, stop guard: " + cmd);
-                            break;
-                        }
-                    }
-                } catch (InterruptedException ignored) {
-                    Log.i(TAG, "thread interrupt, destroy process: " + cmd);
-                    process.destroy();
-                } catch (IOException e) {
-                    atomicIoException.compareAndSet(null, e);
-                } finally {
-                    countDownLatch.countDown();
-                }
-            }
-        }, "GuardThread-" + cmd);
-        guardThread.start();
-        countDownLatch.await();
-        IOException ioException = atomicIoException.get();
-        if (ioException != null) {
-            throw ioException;
-        }
-    }
-
-    private static Process startProcess(List<String> cmd) throws IOException {
-        return new ProcessBuilder(cmd).redirectErrorStream(true).start();
-    }
-
-    public void destroy() {
-        isDestroyed = true;
-        guardThread.interrupt();
-        process.destroy();
-        try {
-            guardThread.join();
-        } catch (InterruptedException ignored) {
-        }
-    }
-
-    @Override
-    public int exitValue() {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public InputStream getErrorStream() {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public InputStream getInputStream() {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public OutputStream getOutputStream() {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public int waitFor() throws InterruptedException {
-        guardThread.join();
-        return 0;
-    }
-}
diff --git a/src/main/java/com/github/shadowsocks/GuardedProcess.scala b/src/main/java/com/github/shadowsocks/GuardedProcess.scala
new file mode 100644
index 00000000..ce6c5469
--- /dev/null
+++ b/src/main/java/com/github/shadowsocks/GuardedProcess.scala
@@ -0,0 +1,147 @@
+/*
+ * Shadowsocks - A shadowsocks client for Android
+ * Copyright (C) 2015 <max.c.lv@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ *                            ___====-_  _-====___
+ *                      _--^^^#####//      \\#####^^^--_
+ *                   _-^##########// (    ) \\##########^-_
+ *                  -############//  |\^^/|  \\############-
+ *                _/############//   (@::@)   \\############\_
+ *               /#############((     \\//     ))#############\
+ *              -###############\\    (oo)    //###############-
+ *             -#################\\  / VV \  //#################-
+ *            -###################\\/      \//###################-
+ *           _#/|##########/\######(   /\   )######/\##########|\#_
+ *           |/ |#/\#/\#/\/  \#/\##\  |  |  /##/\#/  \/\#/\#/\#| \|
+ *           `  |/  V  V  `   V  \#\| |  | |/#/  V   '  V  V  \|  '
+ *              `   `  `      `   / | |  | | \   '      '  '   '
+ *                               (  | |  | |  )
+ *                              __\ | |  | | /__
+ *                             (vvv(VVV)(VVV)vvv)
+ *
+ *                              HERE BE DRAGONS
+ *
+ */
+
+package com.github.shadowsocks
+
+import android.util.Log
+import java.io.IOException
+import java.io.InputStream
+import java.io.OutputStream
+import java.util.concurrent.CountDownLatch
+import java.util.concurrent.atomic.AtomicReference
+
+import collection.JavaConversions._
+
+object GuardedProcess {
+  private val TAG: String = classOf[GuardedProcess].getSimpleName
+
+  @throws(classOf[IOException])
+  private def startProcess(cmd: Seq[String]): Process = {
+    new ProcessBuilder(cmd).redirectErrorStream(true).start
+  }
+}
+
+class GuardedProcess extends Process {
+  private var guardThread: Thread = null
+  @volatile
+  private var isDestroyed: Boolean = false
+  @volatile
+  private var process: Process = null
+
+  @throws(classOf[InterruptedException])
+  @throws(classOf[IOException])
+  def this(cmd: Seq[String], onRestartCallback: Runnable = null) {
+    this()
+    initThread(cmd, onRestartCallback)
+  }
+
+  def initThread(cmd: Seq[String], onRestartCallback: Runnable): Unit = {
+    val atomicIoException: AtomicReference[IOException] = new AtomicReference[IOException](null)
+    val countDownLatch: CountDownLatch = new CountDownLatch(1)
+    guardThread = new Thread(new Runnable() {
+      override def run(): Unit = {
+        try {
+          while (!isDestroyed) {
+            Log.i(GuardedProcess.TAG, "start process: " + cmd)
+            val startTime: Long = java.lang.System.currentTimeMillis
+            process = GuardedProcess.startProcess(cmd)
+            if (onRestartCallback != null && countDownLatch.getCount <= 0) {
+              onRestartCallback.run()
+            }
+            countDownLatch.countDown()
+            process.waitFor
+            if (java.lang.System.currentTimeMillis - startTime < 1000) {
+              Log.w(GuardedProcess.TAG, "process exit too fast, stop guard: " + cmd)
+              return
+            }
+          }
+        }
+        catch {
+          case ignored: InterruptedException =>
+            Log.i(GuardedProcess.TAG, "thread interrupt, destroy process: " + cmd)
+            process.destroy()
+          case e: IOException =>
+            atomicIoException.compareAndSet(null, e)
+        } finally {
+          countDownLatch.countDown()
+        }
+      }
+    }, "GuardThread-" + cmd)
+    guardThread.start()
+    countDownLatch.await()
+    val ioException: IOException = atomicIoException.get
+    if (ioException != null) {
+      throw ioException
+    }
+  }
+
+  def destroy() {
+    isDestroyed = true
+    guardThread.interrupt()
+    process.destroy()
+    try {
+      guardThread.join()
+    }
+    catch {
+      case ignored: InterruptedException =>
+    }
+  }
+
+  def exitValue: Int = {
+    throw new UnsupportedOperationException
+  }
+
+  def getErrorStream: InputStream = {
+    throw new UnsupportedOperationException
+  }
+
+  def getInputStream: InputStream = {
+    throw new UnsupportedOperationException
+  }
+
+  def getOutputStream: OutputStream = {
+    throw new UnsupportedOperationException
+  }
+
+  @throws(classOf[InterruptedException])
+  def waitFor: Int = {
+    guardThread.join()
+    0
+  }
+}
\ No newline at end of file