[improve][core] improve exception print

core/src/main/java/com/wgzhao/addax/core/util/ExceptionTracker.java

@@ -1,16 +1,35 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+
 package com.wgzhao.addax.core.util;
 
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
 public class ExceptionTracker
 {
     public static final  int STRING_BUFFER = 4096;
 
     public static String trace(Throwable e) {
-        StringBuilder sb = new StringBuilder(STRING_BUFFER);
-        sb.append(e.toString()).append("\n");
-        StackTraceElement[] stackTrace = e.getStackTrace();
-        for (StackTraceElement stackTraceElement : stackTrace) {
-            sb.append("\t").append(stackTraceElement).append("\n");
-        }
-        return sb.toString();
+        StringWriter sw = new StringWriter(STRING_BUFFER);
+        PrintWriter pw = new PrintWriter(sw);
+        e.printStackTrace(pw);
+        return sw.toString();
     }
 }