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Add the following into the dependencies in the build.gradle present in root builder(next to hsqldb)

compile group: 'mysql', name: 'mysql-connector-java', version: '5.1.6'

This will download the jar and configure the database url properly (for mysql it is 3306, 1433 is oracle).

mine is :

com.mysql.jdbc.Driver

jdbc:mysql://localhost:3306/mdpnp

<username>

<password>