Hi,
You may want to assign a default group to all authenticated users (i.e: setting the "assign group" property of the JDBC realm to "ANYONE"), and map the "guest" role by group name:
[code]
<security-role-mapping>
<role-name>guest</role-name>
<group-name>ANYONE</group-name>
</security-role-mapping>
[/code]
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