diff --git a/JavaApp/libs/ExagearApacheCommons.jar b/JavaApp/libs/ExagearApacheCommons.jar
deleted file mode 100644
index 59f9b9e6..00000000
Binary files a/JavaApp/libs/ExagearApacheCommons.jar and /dev/null differ
diff --git a/JavaApp/src/main/java/net/kdt/pojavlaunch/Tools.java b/JavaApp/src/main/java/net/kdt/pojavlaunch/Tools.java
index 722753de..306c306f 100644
--- a/JavaApp/src/main/java/net/kdt/pojavlaunch/Tools.java
+++ b/JavaApp/src/main/java/net/kdt/pojavlaunch/Tools.java
@@ -12,8 +12,10 @@ import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.FileWriter;
+import java.io.InputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.OutputStream;
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.lang.reflect.Field;
@@ -589,6 +591,14 @@ public final class Tools
         return out;
     }
 
+    public static void copy(final InputStream input, final OutputStream output) throws IOException {
+        final byte[] buffer = new byte[8192];
+        int n = 0;
+        while ((n = input.read(buffer)) != -1) {
+            output.write(buffer, 0, n);
+        }
+    }
+
     public static File lastFileModified(String dir) {
         File fl = new File(dir);
 
@@ -610,7 +620,6 @@ public final class Tools
         return choice;
     }
 
-
     public static String read(InputStream is) throws IOException {
         String out = "";
         int len;
diff --git a/JavaApp/src/main/java/net/kdt/pojavlaunch/authenticator/mojang/yggdrasil/YggdrasilAuthenticator.java b/JavaApp/src/main/java/net/kdt/pojavlaunch/authenticator/mojang/yggdrasil/YggdrasilAuthenticator.java
index 6f769fc5..5247e146 100644
--- a/JavaApp/src/main/java/net/kdt/pojavlaunch/authenticator/mojang/yggdrasil/YggdrasilAuthenticator.java
+++ b/JavaApp/src/main/java/net/kdt/pojavlaunch/authenticator/mojang/yggdrasil/YggdrasilAuthenticator.java
@@ -5,7 +5,6 @@ import java.net.*;
 import java.nio.charset.*;
 import java.util.*;
 import net.kdt.pojavlaunch.*;
-import org.apache.commons.io.*;
 
 public class YggdrasilAuthenticator {
     private static final String API_URL = "https://authserver.mojang.com/";
@@ -46,7 +45,7 @@ public class YggdrasilAuthenticator {
                 }
                 
                 if (is != null) {
-                    IOUtils.copy(is, bos);
+                    Tools.copy(is, bos);
                     try {
                         is.close();
                     } catch (Exception e) {
diff --git a/JavaApp/src/main/java/net/kdt/pojavlaunch/utils/DownloadUtils.java b/JavaApp/src/main/java/net/kdt/pojavlaunch/utils/DownloadUtils.java
index 4dd85d8c..1ff8c08e 100644
--- a/JavaApp/src/main/java/net/kdt/pojavlaunch/utils/DownloadUtils.java
+++ b/JavaApp/src/main/java/net/kdt/pojavlaunch/utils/DownloadUtils.java
@@ -6,8 +6,6 @@ import java.nio.charset.*;
 
 import net.kdt.pojavlaunch.*;
 
-import org.apache.commons.io.*;
-
 public class DownloadUtils {
     public static final String USER_AGENT = Tools.APP_NAME;
     public static final Charset utf8 = Charset.forName("UTF-8");
@@ -30,7 +28,7 @@ public class DownloadUtils {
 					+ ": " + conn.getResponseMessage());
             }
             is = conn.getInputStream();
-			IOUtils.copy(is, os);
+			Tools.copy(is, os);
         } catch (IOException e) {
             throw new IOException("Unable to download from " + url.toString(), e);
         } finally {
diff --git a/JavaApp/src/main/java/net/kdt/pojavlaunch/utils/FileUtils.java b/JavaApp/src/main/java/net/kdt/pojavlaunch/utils/FileUtils.java
deleted file mode 100644
index 3467b7ca..00000000
--- a/JavaApp/src/main/java/net/kdt/pojavlaunch/utils/FileUtils.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package net.kdt.pojavlaunch.utils;
-
-public class FileUtils
-{
-}
\ No newline at end of file