Tomcat 通过 Maven 导入后找不到 JDBC 驱动程序

Question

I'm new to JSP, so I'm playing around with it a bit. I've created a Maven project in Intellij and imported the dependencies that I need in my pom.xml , namely mysql-connector and servlet-api :

<dependencies>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>4.0.1</version>
    </dependency>

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.20</version>
        <scope>compile</scope>
    </dependency>
</dependencies>

I have a JSP file that accesses the local MySQL database using the corresponding Driver.

<%
    String url = "jdbc:mysql://localhost:80/DemoJSP";
    String username = "root";
    String password = "";

    Class.forName("com.mysql.jdbc.Driver");
    Connection connection = DriverManager.getConnection(url, username, password);
%>

However, when I run the Tomcat server, I get HTTP Status 500 . The cause of this is the line Class.forName("...") , so the thrown exception is java.lang.ClassNotFoundException: com.mysql.jdbc.Driver . I have tried thousands of Maven reimports, but nothing helps. Is there anything that I'm missing?

PS: similar questions like How to use Maven to Create JSP + Servlet + TOMCAT + MySQL or Where do I have to place the JDBC driver for Tomcat's connection pool? do not solve my problem.

Answer 1

Try in url for localhost port 3306 not 80.

And if you get an error whit time zone, use this string:

---

String url = "jdbc:mysql://127.0.0.1:3306/DemoJSP";
String timezone = "?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC";
String username = "root";
String password = "";
Connection connection = DriverManager.getConnection(url + timezone, username, password);