The infamous java.sql.SQLException: No suitable driver found

Question

I\'m trying to add a database-enabled JSP to an existing Tomcat 5.5 application (GeoServer 2.0.0, if that helps).

The app itself talks to Postgres just fine, so I kn

Answer 1

In my case I was working on a Java project with Maven and encountered this error. In your pom.xml file make sure you have this dependencies

<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.11</version>
    </dependency>
  </dependencies>

and where you create connection have something like this

public Connection createConnection() {
        try {
            String url = "jdbc:mysql://localhost:3306/yourDatabaseName";
            String username = "root"; //your my sql username here
            String password = "1234"; //your mysql password here

            Class.forName("com.mysql.cj.jdbc.Driver");
            return DriverManager.getConnection(url, username, password);
        } catch (SQLException | ClassNotFoundException e) {
            e.printStackTrace();
        }

        return null;
    }

Answer 2

You will get this same error if there is not a Resource definition provided somewhere for your app -- most likely either in the central context.xml, or individual context file in conf/Catalina/localhost. And if using individual context files, beware that Tomcat freely deletes them anytime you remove/undeploy the corresponding .war file.

Answer 3

I've forgot to add the PostgreSQL JDBC Driver into my project (Mvnrepository).

Gradle:

// http://mvnrepository.com/artifact/postgresql/postgresql
compile group: 'postgresql', name: 'postgresql', version: '9.0-801.jdbc4'

Maven:

<dependency>
    <groupId>postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>9.0-801.jdbc4</version>
</dependency>

You can also download the JAR and import to your project manually.

Answer 4

As well as adding the MySQL JDBC connector ensure the context.xml (if not unpacked in the Tomcat webapps folder) with your DB connection definitions are included within Tomcats conf directory.

Answer 5

I found the followig tip helpful, to eliminate this issue in Tomcat -

be sure to load the driver first doing a Class.forName(" org.postgresql.Driver"); in your code.

This is from the post - https://www.postgresql.org/message-id/e13c14ec050510103846db6b0e@mail.gmail.com

The jdbc code worked fine as a standalone program but, in TOMCAT it gave the error -'No suitable driver found'

Answer 6

I was using jruby, in my case I created under config/initializers

postgres_driver.rb

$CLASSPATH << '~/.rbenv/versions/jruby-1.7.17/lib/ruby/gems/shared/gems/jdbc-postgres-9.4.1200/lib/postgresql-9.4-1200.jdbc4.jar'

or wherever your driver is, and that's it !