java.lang.IllegalStateException: Could not load JDBC driver class [=com.mysql.cj.jdbc.Driver code example

Example 1: java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Driver

/*
It seems the mysql connectivity library is not included in the project. Solve the problem following one of the proposed solutions:

MAVEN PROJECTS SOLUTION
Add the mysql-connector dependency to the pom.xml project file:

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.39</version>
</dependency>
Here you are all the versions: https://mvnrepository.com/artifact/mysql/mysql-connector-java

ALL PROJECTS SOLUTION
Add the jar library manually to the project.

Right Click the project -- > build path -- > configure build path

In Libraries Tab press Add External Jar and Select your jar.

You can find zip for mysql-connector here (http://dev.mysql.com/downloads/connector/j/5.0.html)
*/

Example 2: IllegalStateException: Cannot load driver class: oracle.jdbc.driver.OracleDriver

<!-- https://mvnrepository.com/artifact/com.oracle.database.jdbc/ojdbc6 -->
<dependency>
    <groupId>com.oracle.database.jdbc</groupId>
    <artifactId>ojdbc6</artifactId>
    <version>11.2.0.4</version>
</dependency>