无法通过servlet连接mysql;访问被拒绝

我是eclipse和servlet的新手。我试图连接数据库（MySQL）。当我在.java应用程序中运行代码时，它起作用，但是当我将代码放入一个servlet时，它不起作用。我已经查看了类似于我的问题，但答案无法解决我的问题。请给我任何想法如何使我的代码工作。谢谢。我的代码如下：无法通过servlet连接mysql;访问被拒绝

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
 
\t \t // TODO Auto-generated method stub 
 
\t \t response.getWriter().append("Served at: ").append(request.getContextPath()); 
 
\t } 
 

 
\t /** 
 
\t * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 
 
\t */ 
 
\t protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
 

 
\t \t Connection conn = null; 
 

 
\t \t \t try{ 
 
\t \t \t Class.forName("com.mysql.jdbc.Driver"); 
 

 
\t \t \t conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test1","root","jeff800205"); 
 

 
\t \t \t } 
 
\t \t \t catch(SQLException e){ 
 
\t \t    System.out.println("@@@Error occured at barDAO->select_all()"); 
 
\t \t    e.printStackTrace(); 
 
\t \t   } catch (ClassNotFoundException e) { 
 
\t \t   \t e.printStackTrace(); 
 
\t \t   \t System.out.println("%%%Error occured at barDAO->select_all()"); 
 
\t \t    
 
\t \t \t \t //} catch (ClassNotFoundException e) { 
 
\t \t \t \t // TODO Auto-generated catch block 
 
\t \t \t \t e.printStackTrace(); 
 
\t \t \t } 
 
\t }

问题如下：

SEVERE: Servlet.service() for servlet [helloBar2] in context with path [/echarts2] threw exception [null] with root cause 
 
java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "setContextClassLoader") 
 
\t at java.security.AccessControlContext.checkPermission(Unknown Source) 
 
\t at java.security.AccessController.checkPermission(Unknown Source) 
 
\t at java.lang.SecurityManager.checkPermission(Unknown Source) 
 
\t at java.lang.Thread.setContextClassLoader(Unknown Source) 
 
\t at com.mysql.jdbc.AbandonedConnectionCleanupThread$1.newThread(AbandonedConnectionCleanupThread.java:50) 
 
\t at java.util.concurrent.ThreadPoolExecutor$Worker.<init>(Unknown Source) 
 
\t at java.util.concurrent.ThreadPoolExecutor.addWorker(Unknown Source) 
 
\t at java.util.concurrent.ThreadPoolExecutor.execute(Unknown Source) 
 
\t at java.util.concurrent.Executors$DelegatedExecutorService.execute(Unknown Source) 
 
\t at com.mysql.jdbc.AbandonedConnectionCleanupThread.<clinit>(AbandonedConnectionCleanupThread.java:54) 
 
\t at java.lang.Class.forName0(Native Method)

我使用Tomcat 8.5，mysql5.7，试图mysql-connector-java 5.1.43-bin.jar和mysql-connector-java 5.0.8.jar。我已将mysql-connector.jar放入WEB_INF下的lib文件夹中，并将mysql-connector.jar放入Tomcat的lib中。但问题依然存在。

这里是我的tomcat的日志文件：

127.0.0.1 - - [28/Aug/2017:09:12:01 +0800] "GET/HTTP/1.1" 200 11452 
 
0:0:0:0:0:0:0:1 - - [28/Aug/2017:09:12:10 +0800] "GET /echarts/test.jsp HTTP/1.1" 200 604 
 
0:0:0:0:0:0:0:1 - - [28/Aug/2017:09:12:16 +0800] "POST /echarts/bar.do HTTP/1.1" 500 2834 
 
127.0.0.1 - - [28/Aug/2017:12:35:06 +0800] "GET/HTTP/1.1" 200 11452 
 
0:0:0:0:0:0:0:1 - - [28/Aug/2017:12:35:16 +0800] "GET /echarts/test.jsp HTTP/1.1" 200 604 
 
0:0:0:0:0:0:0:1 - - [28/Aug/2017:12:35:25 +0800] "POST /echarts/bar.do HTTP/1.1" 500 2834

这里是我的端口imformation： enter image description here

来源

2017-08-28 jeff

将代码和堆栈跟踪添加为文本而不是图像。 – Jens

请看看你的tomcat日志文件并发布整个异常 – Jens

谢谢。这是文本中的代码。 – jeff

检查Java安全管理器选项。

您可以尝试在没有安全管理器的情况下运行tomcat来发现问题。请参见how to disable Security Manager

来源

2017-08-28 09:44:21

我已经将此添加到java.policy中，是否正确？似乎没有帮助。 “permission java.net.SocketPermission”127.0.0.1:3306〃,"connect,resolve“; – jeff

您需要的许可是'java.lang.RuntimePermission”setContextClassLoader“'，而不是'java.net.SocketPermission'。 –

无法通过servlet连接mysql;访问被拒绝

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