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    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

  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 GitHub by checkplys
, 1 year ago
Failed to initialize pool: Access denied for user 'joaopere37625'@'' (using password: YES)
via GitHub by patric-r
, 1 year ago
Failed to initialize pool: IO Error: Socket read timed out
via GitHub by yurique
, 7 months ago
Failed to initialize pool: Connection Error: java.lang.NoSuchMethodError:;
via GitHub by gregko
, 3 months ago
Failed to initialize pool: General error: "java.lang.VerifyError: org.h2.mvstore.db.TransactionStore$TransactionMap" [50000-193]
via Stack Overflow by user6123723
, 1 year ago
Failed to initialize pool: null
via Google Groups by KajMagnus, 1 year ago
Failed to initialize pool: Cannot rollback when autoCommit is enabled.
java.sql.SQLException: Access denied for user 'joaopere37625'@'' (using password: YES)	at com.mysql.jdbc.SQLError.createSQLException(	at com.mysql.jdbc.MysqlIO.checkErrorPacket(	at com.mysql.jdbc.MysqlIO.checkErrorPacket(	at com.mysql.jdbc.MysqlIO.checkErrorPacket(	at com.mysql.jdbc.MysqlIO.secureAuth411(	at com.mysql.jdbc.MysqlIO.doHandshake(	at com.mysql.jdbc.ConnectionImpl.coreConnect(	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(	at com.mysql.jdbc.ConnectionImpl.createNewIO(	at com.mysql.jdbc.ConnectionImpl.(	at com.mysql.jdbc.JDBC4Connection.(	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(	at java.lang.reflect.Constructor.newInstance(	at com.mysql.jdbc.Util.handleNewInstance(	at com.mysql.jdbc.ConnectionImpl.getInstance(	at com.mysql.jdbc.NonRegisteringDriver.connect(	at com.zaxxer.hikari.util.DriverDataSource.getConnection(	at com.zaxxer.hikari.util.DriverDataSource.getConnection(	at com.zaxxer.hikari.pool.PoolBase.newConnection(	at com.zaxxer.hikari.pool.HikariPool.checkFailFast(	at com.zaxxer.hikari.pool.HikariPool.(	at com.zaxxer.hikari.HikariDataSource.(	at com.github.games647.fastlogin.core.Storage.(	at com.github.games647.fastlogin.core.FastLoginCore.setupDatabase(	at com.github.games647.fastlogin.bungee.FastLoginBungee.onEnable(	at net.md_5.bungee.api.plugin.PluginManager.enablePlugins(	at net.md_5.bungee.BungeeCord.start(	at net.md_5.bungee.BungeeCordLauncher.main(	at net.md_5.bungee.Bootstrap.main(