java.sql.SQLException：找不到适合jdbc的驱动程序

Question

I am attempting to run some queries using JDBC and keep getting this error:

Exception in thread "main" java.lang.IllegalStateException: error
        at com.mycompany.app.App.writer(App.java:195)
        at com.mycompany.app.App.main(App.java:19)
Caused by: java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/dbname

here is the relevant part of my code:

public class App {
           writer();
}

public static void writer() {
        String url = "jdbc:mysql://localhost:3306/dbname
        String username = "root";
        String password = "password";
        try (Connection connection = DriverManager.getConnection(url, username, password)) {
            Statement st = connection.createStatement();
            ResultSet r= st.executeQuery("insert query here");
        } catch (SQLException e) {
            throw new IllegalStateException("error");
        }

    }
}

When I run it through Intellij Idea it works, but I need it to run on a server running Centos.
I have tried running it with this commands:

 javac -cp "filepath/mysql-connector-java-5.1.35-bin.jar" App.java  
 java -cp ".filepath/mysql-connector-java-5.1.35-bin.jar" App

I have tried running it using maven, including

  <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.35</version>
    </dependency>

in pom.xml and still get the same error

I have looked through many articles online (and stack questions) and still can't find the solution.

The server is running CentoOS 6.6 and the database is running locally.

I am using:

java version "1.8.0_45" Java(TM) SE Runtime Environment (build 1.8.0_45-b14) Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

Answer 1

Entries on the classpath on Unix-like operating systems must be separated by : . Add a : between . (which indicates the current directory) and the path of the jar:

java -cp .:filepath/mysql-connector-java-5.1.35-bin.jar App

Answer 2

Alternatively, you may place your mysql-connector-java-5.1.35-bin.jar to the following directory -

JAVA_HOME/jre/lib/ext 

If you place the jar in this directory then you don't have to add it to classpath by using command.

Answer 3

You can try loading the driver class using class.forName("qualified name of driver class") . This should resolve the issue if you're not facing the issue of class path with maven. Have a look at this where the index tag was removed from pom and it worked.