did u change anything between the previous post and this one ?.
Strings are used to represent the username within the JDBCRealm.
does your form specify the UTF-8 encoding
<form action="j_security_check" method="post" enctype="UTF-8">
<input id="j_username" type="text" value="" name="j_username"/>
<input id="j_password" type="password" value="" name="j_password"/>
<input type="submit" value="Login" />
</form>
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