com.mysql.jdbc.Driver ClassNotFoundException Eclipse

Question

i got a ClassNotFoundException with this code:

try {
        Class.forName("com.mysql.jdbc.Driver");
    } catch (ClassNotFoundException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
    MySQL.connect();

I imported the mysql-connector ( http://dev.mysql.com/downloads/connector/j/5.0.html ) and added it in a special folder (I named it External) and added it to the build-path. When I launch it in Eclipse it works fine for me but if I export it as jar and launch it by java -jar it does not work to me and I get the ClassNotFoundException... Hope someone could help me :) Mabye it has to do something with the classpath but how do I edit it because -cp External/mysql-connector.jar does not work..

Answer 1

When you use java -jar the -cp option is ignored. See the tool documentation. You have to list the dependent JARs in the Class-path entry of the Manifest.

However the Class.forName() line hasn't been needed since 2007.

Answer 2

我也认为您必须通过[-cp]配置导入的库，例如

java -cp ../lib/mysql-connector.jar;../lib/* ・・・