Create the MongoManager

First of all, you need to connect to the mongo database. Do that by creating a new instance of MongoManager.

Example of creating a MongoManager:

public class Application {

    public static void main(String[] args) {
        MongoManager manager = new MongoManager();
    }
}

If a MongoManager is created without arguments, the credentials are read from the following locations:

1. From Disk: {applicationDirectory}/credentials.properties

2. From Resource: {applicationJar}/credentials.properties

If no credentials are found, an exception is thrown.

Here you can see the default keys of the two required properties.

Default credentials.properties:

en2do.connectString=mongodb://<username>:<password>@<host>:<port>/?<options>
en2do.database=<database>

You can also create credentials through various other methods.

Example of creating new Credentials:

public class Application {
    public static void main(String[] args) {
        Credentials credentials;

        // Loading properties from resources file /resources/credentials.properties
        credentials = Credentials.fromResource(); 
        // Loading properties erty from resources file of given path
        credentials = Credentials.fromResource("/path/to/resources.properties");
        
        // Loading properties from the file-storage {jar-directory}/credentials.properties
        credentials = Credentials.fromFile();
        // Loading properties from the file-storage of given path
        credentials = Credentials.fromFile("/path/to/file.properties");
        
        // Loading the properties from the system properties
        credentials = Credentials.fromSystemProperties();
        // Loading the properties from the system properties, 
        // using custom keys
        credentials = Credentials.fromSystemProperties("CONNECT_KEY", "DATABASE_KEY");

        // Keys are "EN2DO_CONNECTSTRING" and "EN2DO_DATABASE"
        
        // Loading the properties from the system environmental variables
        credentials = Credentials.fromSystemEnvVars();
        // Loading the properties from the system environmental variables, 
        // using custom keys
        credentials = Credentials.fromSystemEnvVars("CONNECT_KEY", "DATABASE_KEY");

        // Creating credentials with strings.
        credentials = Credentials.of("connectString", "database");
    }
}

After you created a Credentials object, just pass it into the MongoManager constructor.

Example of creating a new MongoManager with Credentials:

public class Application {

    public static void main(String[] args) {
        MongoManager manager = new MongoManager(Credentials.of("connectString", "databaseName"));
    }
}

Learn more about the MongoDB ConnectionString