Wicketで、ResponseからOutputStreamを取り出せるのはWebApplicationからgetHomePageしたクラスだけっぽい？
ちなみに、これが出てきたエラー
java.lang.UnsupportedOperationException: Cannot get output stream on BufferedResponse
at org.apache.wicket.protocol.http.BufferedHttpServletResponse.getOutputStream(BufferedHttpServletResponse.java:322)
at org.apache.wicket.protocol.http.WebResponse.getOutputStream(WebResponse.java:169)
at example.FirstFeedSample.onRender(FirstFeedSample.java:72)
at org.apache.wicket.Component.render(Component.java:2361)
at org.apache.wicket.Page.renderPage(Page.java:906)
at org.apache.wicket.protocol.http.WebRequestCycle.redirectTo(WebRequestCycle.java:166)
at org.apache.wicket.request.target.component.PageRequestTarget.respond(PageRequestTarget.java:58)
at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:104)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1194)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1265)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1366)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:498)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:444)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:282)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at com.staxnet.appserver.filters.RequestMonitorValve.invoke(RequestMonitorValve.java:35)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:880)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:719)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2081)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
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