If the database driver fails to establish a connection or a database communication link failure, the database exception .: Communications link failure will be thrown. The database driver helps to create a connection between the java and the database, and performs query execution in the java application database. Java Database Connectivity (JDBC) is used to connect a database to a Java application. Therefore, the java exception .: Communications link failure will be thrown. The Jdbc connection between the java and mysql database could not be established. The Java application was unable to establish communication between mysql database driver and mysql database. The spring boot exception .: Communications link failure happens when the java mysql database driver is unable to connect to mysql database. The driver has not received any packets from the server.Ĭaused by: : Connection refusedĬaused by: : localhost: unknown errorĬaused by: : Connection timed out The last packet sent successfully to the server was 0 milliseconds ago. : Communications link failureĬom.4.CommunicationsException: Communications link failure
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