Communications link failure MySQL

Question

i have about 50k excel rows to insert into my database . for each row i have to select a number form tableA on this database and increment it ( with an update to the same tableA) and i do this for each row the problem is that some rows works normally but in many times i get this message error :

com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:833) at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:453) at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246) at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198) at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:677) at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:228)

how can i solve this .

this is the configuration of connection to database :

url = jdbc:mysql://adress:3306/database?useServerPrepStmts=false&rewriteBatchedStatements=TRUE
driver = com.mysql.cj.jdbc.Driver