diff --git a/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/persistance/PersistenceThread.java b/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/persistance/PersistenceThread.java
index 8538ac8a3..011c59444 100644
--- a/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/persistance/PersistenceThread.java
+++ b/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/persistance/PersistenceThread.java
@@ -16,9 +16,13 @@ public class PersistenceThread extends Thread {
 
     @Override
     public void run() {
-        int length = 0;
+        int length;
+        File file1;
+        BufferedReader bufferedReader;
+        int offset;
+        StringBuffer data;
         while (true) {
-            File file1 = getDataFiles();
+            file1 = getDataFiles();
             if (file1 == null) {
                 try {
                     Thread.sleep(SWITCH_FILE_WAIT_TIME);
@@ -29,13 +33,13 @@ public class PersistenceThread extends Thread {
             }
 
             try {
-                BufferedReader bufferedReader = new BufferedReader(new FileReader(file1));
-                int offset = moveOffSet(file1, bufferedReader);
+                bufferedReader = new BufferedReader(new FileReader(file1));
+                offset = moveOffSet(file1, bufferedReader);
                 if (logger.isDebugEnabled()) {
                     logger.debug("Get file[{}] offset [{}]", file1.getName(), offset);
                 }
                 char[] chars = new char[OFFSET_FILE_READ_BUFFER_SIZE];
-                StringBuilder data = new StringBuilder(2048);
+                data = new StringBuffer(2048);
                 boolean bool = true;
                 length = 0;
                 while (bool) {
diff --git a/skywalking-server/src/main/resources/config.properties b/skywalking-server/src/main/resources/config.properties
index 2b1c50d64..4cf655049 100644
--- a/skywalking-server/src/main/resources/config.properties
+++ b/skywalking-server/src/main/resources/config.properties
@@ -1,5 +1,5 @@
 #采集服务器的端口
-server.port=34000
+server.port=35000
 
 #最大数据缓存线程数量
 buffer.max_thread_number=1