ClassCastException using elasticsearch

Hello,

I am using the Apache CXF 2.5.0. Whenever I try to create the service, I get a ClassCastException:

CatalogueService catalogueService = null;
JaxWsProxyFactoryBean factory = new JaxWsProxyFactoryBean();
factory.setServiceClass(CatalogueService.class);
factory.setAddress("http://xxx/ESWebservice/services/csSearch");
catalogueService = (CatalogueService) factory.create();

What am I doing wrong? What causes this ClassCastException?

ERROR [jsp:154] java.lang.ClassCastException: $Proxy460 cannot be cast to com.mobilitymedia.es.search.common.CatalogueService
at de.td.digital.pap.service.util.CatalogueEntryIndexer.createCatalogue(CatalogueEntryIndexer.java:53)
at de.td.digital.pap.portlet.CatalogueController.renderAfterCreateCustomEntry(CatalogueController.java:281)
at javax.portlet.GenericPortlet.render(GenericPortlet.java:233)
at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:101)
at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:64)
at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:92)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at com.liferay.portlet.InvokerPortletImpl.invoke(InvokerPortletImpl.java:638)
at com.liferay.portlet.InvokerPortletImpl.invokeRender(InvokerPortletImpl.java:723)
at com.liferay.portlet.InvokerPortletImpl.render(InvokerPortletImpl.java:425)
at org.apache.jsp.html.portal.render_005fportlet_jsp._jspService(render_005fportlet_jsp.java:1440)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)