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  1. ,
    Expert tip

    MySQL doesn't support some types of characters (such as emojis) with the utf8 encoding. You need to be on MySQL 5.5+ and force utf8mb4 (everywhere, client and server). You can do this sending the query "SET NAMES utf8mb4". Check this https://goo.gl/3E2qzg

  2. ,

    Make sure you are using InnoDB storage engine and READ-COMMITTED transaction isolation level and increase the database server innodb_lock_wait_timeout variable to about 500.

Solutions on the web

via Server Fault by CodeMed
, 1 year ago
Could not create connection to database server. Attempted reconnect 3 times. Giving up.
via serverfault.com by Unknown author, 1 year ago
Could not create connection to database server. Attempted reconnect 3 times. Giving up.
via Stack Overflow by kumar-kunal
, 7 months ago
Could not create connection to database server. Attempted reconnect 3 times. Giving up.
via Stack Overflow by Ali İ.
, 1 year ago
Could not create connection to database server. Attempted reconnect 3 times. Giving up.
via GitHub by DatGamerGuy
, 2 years ago
Could not create connection to database server. Attempted reconnect 3 times. Giving up.
via GitHub by elliswin
, 2 years ago
Could not create connection to database server. Attempted reconnect 3 times. Giving up.
java.sql.SQLException: null,  message from server: "Host 'mydomain.com' is not allowed to connect to this MariaDB server"	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1114)	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2493)	at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2334)	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2316)	at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:834)	at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:47)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:347)	at java.sql.DriverManager.getConnection(DriverManager.java:571)	at java.sql.DriverManager.getConnection(DriverManager.java:215)	at mainpackage.TestJDBC.main(TestJDBC.java:23)