@资源注入突然停止工作

Question

您好，在我的项目中要连接到数据库，我正在使用contex.xml文件（我拥有所有数据库数据）和@Resource（name =“ xyz”）批注，并使用它在Servlet中创建dataSource：< / p>

@WebServlet(name = "BookControllerServlet", urlPatterns = {"/BookControllerServlet"})
public class BookControllerServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

private BookDbUtil bookDbUtil;

@Resource(name = "sql2226123")
private DataSource dataSource;

// init method will be called by the app server when this servlet is loaded or initialized
@Override // we inherit it from GenericServlet
public void init() throws ServletException {
    super.init(); //To change body of generated methods, choose Tools | Templates.

    // create our book db util ... and pass in the connection pool / datasource
    try {
        bookDbUtil = new BookDbUtil(dataSource); // bookDbUtil is a data member that we've defined
    } // dataSource is resource injection item our connection pool and we're passing it right here
    catch (Exception exc) {
        throw new ServletException(exc);
    }
}

但是，它每天都突然停止工作。我的意思是@Resource（name =“ sql2226123”）不提供任何数据。 dataSource == null，myConn == null;发生了什么？这次没有更改context.xml为100％良好。如果我没记错的话，最近我做了一些jdk更新。也许与它有关？我当前的Java版本是：1.8.0_81-b13。有任何想法吗？有人听说过吗？

这是我的context.xml：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xml>
<Context path="jadbc/ParkingSystem">
    <Resource name="sql2226123" 
        auth="Container" type="javax.sql.DataSource"
        maxActive="20" maxIdle="5" maxWait="10000"
        username="sql2226123" password="xxxxxxxx" 
        driverClassName="com.mysql.jdbc.Driver"
        url="jdbc:mysql://sql2.freemysqlhosting.net:3306/sql2226123"/>
</Context>

我也设法得到以下错误：