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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

  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 Google Groups by Grzegorz Kamola, 1 year ago
Unexpected exception[SQLTimeoutException: Timeout after 1003ms of waiting for a connection.]
via GitHub by rajthilakmca
, 2 years ago
Unexpected exception[ExceptionInInitializerError: null]
via Stack Overflow by user2079778
, 2 years ago
Unexpected exception[ClassNotFoundException: play.api.libs.mailer.CommonsMailerPlugin]
via Stack Overflow by aneesh munnam
, 1 year ago
Unexpected exception[ExceptionInInitializerError: null]
via GitHub by Steiny69
, 1 year ago
Unexpected exception[SQLSyntaxErrorException: ORA-00904: : invalid identifier ]
via Google Groups by malik dul, 1 year ago
Unexpected exception[UnsatisfiedDependencyException: Error creating bean with name 'class play.libs.Crypto': Unsatisfied dependency expressed through constructor parameter 0; nested exception is
java.sql.SQLException: Access denied for user ''@'' 
(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.proceedHandshakeWithPluggableAuthentication(	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.(