If you have multiple JDK’s installed it is not certain Maven will pick up the expected java and you could end up with unexpected results. You can verify which JDK Maven uses by running mvn --version.
Collections are analogous to tables in relational databases. If a collection does not exist, MongoDB creates the collection when you first store data for that collection.
You can go to https://www.katacoda.com/mysql-db-sandbox/scenarios/mysql-sandbox to access the MySQL Sandbox, which has the Sakila sample database loaded in a MySQL instance. You’ll have to set up a (free) Katacoda account. Then, click the Start Scenario button. See also: https://dev.mysql.com/doc/index-other.html
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