showcase-portlet -> ace:list

A NullPointerException occurs when accessing or sometimes reloading a page with all ace:list portlets added. This error cannot be consistently reproduced, however it usually occurred when accessing the page with the list portlets after restarting the server, usually in IE11 but also in FF34.
It was also seen when accessing the page from a remote PC in IE11.

Also, in IE11 a JS error occurs on page reload:
SCRIPT5022: Missing resources for "ListControl" component. See "http://www.icesoft.org/wiki/display/ICE/mandatoryResourceConfiguration" for more details.
File: ice05, Line: 4, Column: 469

Server error:
23:05:34,880 ERROR [RuntimePageImpl-1][render_portlet_jsp:132] null
java.lang.NullPointerException
        at com.liferay.portal.kernel.util.StringBundler.length(StringBundler.java:179)
        at com.liferay.faces.bridge.container.liferay.PortletContainerLiferayCompatImpl.beforePhase(
PortletContainerLiferayCompatImpl.java:102)
        at com.liferay.faces.bridge.event.PortletContainerProxyPhaseListener.beforePhase(PortletCont
ainerProxyPhaseListener.java:50)
        at com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:228)
        at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:99)
        at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
        at com.liferay.faces.bridge.BridgePhaseRenderImpl.execute(BridgePhaseRenderImpl.java:229)
        at com.liferay.faces.bridge.BridgePhaseRenderImpl.execute(BridgePhaseRenderImpl.java:84)
        at com.liferay.faces.bridge.BridgeImpl.doFacesRequest(BridgeImpl.java:117)
        at javax.portlet.faces.GenericFacesPortlet.doView(GenericFacesPortlet.java:255)
        at javax.portlet.GenericPortlet.doDispatch(GenericPortlet.java:328)
        at javax.portlet.faces.GenericFacesPortlet.doDispatch(GenericFacesPortlet.java:204)
        at javax.portlet.GenericPortlet.render(GenericPortlet.java:233)
        at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:103)
        at com.liferay.portlet.ScriptDataPortletFilter.doFilter(ScriptDataPortletFilter.java:55)
        at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:100)
        at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:64)
        at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:112)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j
ava:305)