Preparing for Confluence 9.0 - EAP out now

I ran into the same a few days ago. You must either use the com.atlassian.xwork.PermittedMethods annotation or the permittedMethods parameter in your action definition:

<action name="viewconfig" class="com.myplugin.ConfigAction" method="doView">
    <param name="permittedMethods">GET</param>
    <result name="success" type="velocity">/templates/vm/config-pane.vm</result>
</action>                
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