以下の例外が発生する。

java.lang.IllegalStateException: レスポンスをコミットした後でセッションを作成できません
org.apache.catalina.connector.Request.doGetSession(Request.java:2221)
org.apache.catalina.connector.Request.getSession(Request.java:2031)
org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:832)
org.seasar.ymir.redirection.impl.RedirectionManagerImpl.getSession(RedirectionManagerImpl.java:109)
org.seasar.ymir.redirection.impl.RedirectionManagerImpl.getSession(RedirectionManagerImpl.java:100)
org.seasar.ymir.redirection.impl.RedirectionManagerImpl.getScopeMap(RedirectionManagerImpl.java:69)
org.seasar.ymir.redirection.impl.RedirectionManagerImpl.getScopeMap(RedirectionManagerImpl.java:60)
org.seasar.ymir.impl.RedirectionInterceptor.responseProcessingStarted(RedirectionInterceptor.java:41)
org.seasar.ymir.impl.DefaultResponseProcessor.process(DefaultResponseProcessor.java:66)
org.seasar.ymir.impl.YmirImpl.processResponse(YmirImpl.java:170)
org.seasar.ymir.zpt.ZptYmir.processResponse(ZptYmir.java:48)
org.seasar.ymir.servlet.YmirFilter.doFilter(YmirFilter.java:116)
org.seasar.cms.pluggable.servlet.PluggableFilter.doFilter(PluggableFilter.java:43)
org.seasar.ymir.MultipartRequestFilter.doFilter(MultipartRequestFilter.java:35)
...