Pool Error Object Timeout (Java JDBC)

I recently upgraded my MySQL server to MariaDB, since then I am having trouble with several errors.

After a while, my application will crash and the following errors will appear:

java.util.NoSuchElementException: Timeout waiting for idle object

      

        
        
        
      

    

or

Cannot get a connection, pool error Timeout waiting for idle object

      

        
        
        
      

    

Or NullPointerExceptions on executeUpdate () in prepared language!

My code for connecting to the database:

public static void connect() {
    try {
        connection = DriverManager.getConnection("jdbc:mysql://"
                + Data.MySQL_host + ":3306/" + Data.MySQL_db,
                Data.MySQL_user, Data.MySQL_pass);
        System.out.println("MySQL connected!");
    } catch (SQLException e) {
        System.out.println("Error connecting to MySQL");
        e.printStackTrace();
    }
}

      

        
        
        
      

    

Do I need to modify my MariaDB server or link it to my application?