"java.lang.ClassNotFoundException: com.mysql.jdbc.Driver" is a frequent Exception Java programmer face while writing JDBC connectivity code for MySQL, especially if you are trying to establish a JDBC connection to MySQL database first time. we have touched base on ClassNotFoundException in MySQL on our earlier articles on how to resolve ClassNotFoundException in Java and here we will see in detail what causes "java.lang.ClassNotFoundException: com.mysql.jdbc.Driver" and how to fix com.mysql.jdbc.Driver error in Java.