Portlet Issue with I18Interceptor

Portlets always throw the following exception:

java.lang.IllegalStateException: Not allowed in a portlet

Below is the method in the classs
org.apache.struts2.portlet.servlet.PortletServletRequest where this always
happens:

public Cookie[] getCookies() {
    if (portletRequest instanceof HttpServletRequest) {
        return ((HttpServletRequest) portletRequest).getCookies();
    }
    throw new IllegalStateException("Not allowed in a portlet");
}

Apparently, the "portletRequest" variable is not an instance of "HttpServletRequest".

NOTE - There are many other methods in class PortletServletRequest that use the exact same assumption/logic as the "getCookies()" method.

That class is invoked by the class
org.apache.struts2.interceptor.I18nInterceptor, which was just changed in version 2.5.5. See change https://issues.apache.org/jira/browse/WW-4686

Finally, below is a partial stack trace

SEVERE: Servlet.service() for servlet struts2portlet threw exception
java.lang.IllegalStateException: Not allowed in a portlet
at
org.apache.struts2.portlet.servlet.PortletServletRequest.getCookies(PortletServletRequest.java:101)
at
org.apache.struts2.interceptor.I18nInterceptor.readStoredLocale(I18nInterceptor.java:215)
at
org.apache.struts2.interceptor.I18nInterceptor.storeLocale(I18nInterceptor.java:189)
at
org.apache.struts2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:144)
at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:240)
at
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:171)
at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:240)
at
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:195)
at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:240)
at
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:193)
at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:240)
at
org.apache.struts2.portlet.interceptor.PortletAwareInterceptor.intercept(PortletAwareInterceptor.java:81)
at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:240)
at
org.apache.struts2.portlet.interceptor.PortletStateInterceptor.intercept(PortletStateInterceptor.java:51)
at
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:240)
at
org.apache.struts2.factory.StrutsActionProxy.execute(StrutsActionProxy.java:54)
at
org.apache.struts2.portlet.dispatcher.Jsr168Dispatcher.serviceAction(Jsr168Dispatcher.java:481)
at
org.apache.struts2.portlet.dispatcher.Jsr168Dispatcher.render(Jsr168Dispatcher.java:341)
at
org.jasig.portal.portlet.container.FilterChainImpl.doFilter(FilterChainImpl.java:183)
at
org.jasig.portal.portlet.container.FilterChainImpl.processFilter(FilterChainImpl.java:99)
at
org.jasig.portal.portlet.container.FilterManagerImpl.processFilter(FilterManagerImpl.java:110)
at
org.apache.pluto.container.driver.PortletServlet.dispatch(PortletServlet.java:340)
at
org.apache.pluto.container.driver.PortletServlet.doGet(PortletServlet.java:261)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)