diff --git a/.gitignore b/.gitignore
index 0a7d0a5d..2f961d9e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,4 +11,5 @@
 .idea/misc.xml
 .gradle
 /.idea
-.idea
\ No newline at end of file
+.idea
+/cache
\ No newline at end of file
diff --git a/Aria/build.gradle b/Aria/build.gradle
index 4f351abc..1e811256 100644
--- a/Aria/build.gradle
+++ b/Aria/build.gradle
@@ -7,8 +7,8 @@ android {
   defaultConfig {
     minSdkVersion 9
     targetSdkVersion 23
-    versionCode 312
-    versionName "3.1.2"
+    versionCode 313
+    versionName "3.1.3"
   }
   buildTypes {
     release {
@@ -23,4 +23,4 @@ dependencies {
   testCompile 'junit:junit:4.12'
   compile 'com.android.support:appcompat-v7:23.1.1'
 }
-//apply from: 'jcenter.gradle'
+apply from: 'jcenter.gradle'
diff --git a/Aria/src/main/java/com/arialyy/aria/core/queue/AbsTaskQueue.java b/Aria/src/main/java/com/arialyy/aria/core/queue/AbsTaskQueue.java
index bdccfe9c..15c10575 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/queue/AbsTaskQueue.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/queue/AbsTaskQueue.java
@@ -31,7 +31,7 @@ abstract class AbsTaskQueue<TASK extends ITask, TASK_ENTITY extends ITaskEntity,
     implements ITaskQueue<TASK, TASK_ENTITY, ENTITY> {
   private final String TAG = "AbsTaskQueue";
   CachePool<TASK> mCachePool = new CachePool<>();
-  ExecutePool<TASK> mExecutePool = null;
+  ExecutePool<TASK> mExecutePool;
 
   /**
    * 获取任务执行池
diff --git a/Aria/src/main/java/com/arialyy/aria/core/queue/UploadTaskQueue.java b/Aria/src/main/java/com/arialyy/aria/core/queue/UploadTaskQueue.java
index 2430782e..21513f72 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/queue/UploadTaskQueue.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/queue/UploadTaskQueue.java
@@ -32,7 +32,6 @@ public class UploadTaskQueue extends AbsTaskQueue<UploadTask, UploadTaskEntity,
   private static final String TAG = "UploadTaskQueue";
   private static volatile UploadTaskQueue INSTANCE = null;
   private static final Object LOCK = new Object();
-  private ExecutePool<UploadTask> mExecutePool = new ExecutePool<>(false);
 
   public static UploadTaskQueue getInstance() {
     if (INSTANCE == null) {
@@ -43,6 +42,9 @@ public class UploadTaskQueue extends AbsTaskQueue<UploadTask, UploadTaskEntity,
     return INSTANCE;
   }
 
+  private UploadTaskQueue() {
+    mExecutePool = new ExecutePool<>(false);
+  }
 
   @Override public void setMaxTaskNum(int newMaxNum) {
 
@@ -74,5 +76,4 @@ public class UploadTaskQueue extends AbsTaskQueue<UploadTask, UploadTaskEntity,
       Log.d(TAG, "从缓存池删除任务，删除" + (mCachePool.removeTask(task) ? "成功" : "失败"));
     }
   }
-
 }
diff --git a/app/src/main/java/com/arialyy/simple/upload/UploadActivity.java b/app/src/main/java/com/arialyy/simple/upload/UploadActivity.java
index 6325df0e..87fa2772 100644
--- a/app/src/main/java/com/arialyy/simple/upload/UploadActivity.java
+++ b/app/src/main/java/com/arialyy/simple/upload/UploadActivity.java
@@ -81,7 +81,7 @@ public class UploadActivity extends BaseActivity<ActivityUploadMeanBinding> {
   @OnClick(R.id.upload) void upload() {
     Aria.upload(this)
         .load(FILE_PATH)
-        .setUploadUrl("http://172.18.104.50:8080/upload/sign_file")
+        .setUploadUrl("http://172.18.104.228:8080/upload/sign_file")
         .setAttachment("file")
         .start();
   }