Hello, i found this in Seam Reference
Sets the character encoding of submitted form data.
This filter is not installed by default and requires an entry in components.xml to enable it:
? encoding ? The encoding to use.
? override-client ? If this is set to true, the request encoding will be set to whatever is specified by encoding
no matter whether the request already specifies an encoding or not. If set to false, the request encoding
will only be set if the request doesn't already specify an encoding. The default setting is false.
? url-pattern ? Used to specify which requests are filtered, the default is all requests.