找不到类com.mysql.jdbc.Driver

Question

I got this error

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

but I have this class in my pom.xml and its in my maven dependencies folder. Each time I added some lib to pom.xml everything was ok till now I even try to do maven -> update project but it didn't help

Im using Eclipse Juno

Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection c = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "*****");     
return c;

Edit pom.xml

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.21</version>
    <scope>compile</scope>
</dependency>  

Answer 1

There is a more straitforward way to get a connection:

Connection c = new com.mysql.jdbc.Driver().connect("jdbc:mysql://localhost/test?user=root&password=root", null);

There will be no puzzles like ClassNotFoundException

Answer 2

How do you start the server? How do you do deployment? From inside eclipse? Check the deployed folder if the jar is there. If you're using eclipse it will be in:

${workspace}\\.metadata\\.plugins\\org.eclipse.wst.server.core\\tmp0\\wtpwebapps\\ROOT\\WEB-INF\\lib (if using windows)

Your maven config and code look fine, I would say it's a deployment problem.

Answer 3

您需要将mysql连接器jar添加到项目类路径中作为外部jar ..然后它将正常工作：D