What is the meaning of "DriverManager.getConnection error" and "No connection"?

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"DriverManager.getConnection error" typically refers to an error that occurs when attempting to establish a connection to a database using the DriverManager class in Java. This error can occur for a number of reasons, such as incorrect login credentials, a missing JDBC driver, or a problem with the database server.

"No connection" usually means that the application or program is unable to establish a connection to the database. This error can occur if the database server is down, the server name or IP address is incorrect, the login credentials are incorrect, or there is a network issue. The program will typically display an error message indicating that it was unable to establish a database connection.