java.lang.IllegalStateException - 在提交響應後無法創建會話

Question

我在我的項目中使用了JSF + PrimeFaces。我爲此準備了一個Maven項目。 當我編譯我的項目，並在主頁被加載後，我收到以下異常：

java.lang.IllegalStateException: Cannot create a session after the response has been committed 
    at org.apache.catalina.connector.Request.doGetSession(Request.java:2754) 
    at org.apache.catalina.connector.Request.getSession(Request.java:2264) 
    at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:899) 
    at com.sun.faces.context.ExternalContextImpl.getSession(ExternalContextImpl.java:155) 
    at com.sun.faces.renderkit.ServerSideStateHelper.writeState(ServerSideStateHelper.java:175) 
    at com.sun.faces.renderkit.ResponseStateManagerImpl.writeState(ResponseStateManagerImpl.java:122) 
    at com.sun.faces.application.StateManagerImpl.writeState(StateManagerImpl.java:166) 
    at com.sun.faces.application.view.WriteBehindStateWriter.flushToWriter(WriteBehindStateWriter.java:225) 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:419) 
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:125) 
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) 
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:279) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:300) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) 
    at java.lang.Thread.run(Thread.java:619) 
1 Jun, 2012 10:13:39 AM com.sun.faces.context.ExceptionHandlerImpl throwIt 
INFO: Exception when handling error trying to reset the response. 
java.lang.IllegalStateException: Cannot create a session after the response has been committed 
    at org.apache.catalina.connector.Request.doGetSession(Request.java:2754) 
    at org.apache.catalina.connector.Request.getSession(Request.java:2264) 
    at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:899) 
    at com.sun.faces.context.ExternalContextImpl.getSession(ExternalContextImpl.java:155) 
    at com.sun.faces.renderkit.ServerSideStateHelper.writeState(ServerSideStateHelper.java:175) 
    at com.sun.faces.renderkit.ResponseStateManagerImpl.writeState(ResponseStateManagerImpl.java:122) 
    at com.sun.faces.application.StateManagerImpl.writeState(StateManagerImpl.java:166) 
    at com.sun.faces.application.view.WriteBehindStateWriter.flushToWriter(WriteBehindStateWriter.java:225) 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:419) 
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:125) 
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) 
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:279) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:300) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) 
    at java.lang.Thread.run(Thread.java:619) 

這是怎麼造成的，我該如何解決呢？

Answer 1

這是一個在Mojarra的錯誤，並已報告其他issue 2277。它已在Mojarra 2.1.8中修復。 Currently Mojarra 2.1.9已經上市。只需升級到最新版本，這個問題就會消失。

原因是在第一個請求返回一個相對較大的頁面時，會話創建得太晚，其中一個視圖或會話範圍的託管bean在頁面中相對較晚的時候被首次引用。視圖或會話範圍的bean需要存儲在會話中。如果會話尚不存在，則需要創建該會話。

當第一次創建會話時，服務器needs在響應頭中設置一個cookie。但是，這隻有在響應尚未發送（提交）給客戶端時纔有可能。如果已經發生，那麼你將面臨這個例外。響應的一部分可能已經在響應緩衝區溢出時自動發送，通常爲2KB，具體取決於服務器配置。你的頁面顯然大於緩衝區大小。