java.sql.SQLException: Unknown initial character set index '255' received from server for connector 8.0.11

Using MySQLWorkbench interface:

First click in your connection ->

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After click in Options File

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And change character-set-server and collation-server values to the values below:

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Make sure to restart mysql server by opening services and restarting mysql server.

With version 8 the default characterset changed. When you add your character set to the connection URL like ?characterEncoding=latin1 it might work.

Sounds like you need to download the latest connector j jar:

http://chillyfacts.com/java-sql-sqlexception-unknown-initial-character-set-index-224-received-server/

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