no-connection servlet issue
NOT URGENT
I have a (third party) java applet, that connects to my servlet sending following request when it is initialized:
HEAD /twentyfouract//servlets/multiupload HTTP/1.1 Host: localhost Connection: close
this works fine and returns what I expect (I implemented only doPost):
HTTP/1.1 405 HTTP method GET is not supported by this URL
but since I need some seam components in my servlet, I activate the seam web context filter, in my components.xml as described in http://docs.jboss.com/seam/latest/reference/en/html/configuration.html#d0e13654:
<web:context-filter url-pattern="/servlets/*" />
when I activate this context filter, the request above will always cause the following exception on the server:
15:10:16,631 ERROR [[multiupload]] Servlet.service() for servlet multiupload threw exception java.lang.IllegalStateException: Cannot create a session after the response has been committed at org.apache.catalina.connector.Request.doGetSession(Request.java:2284) at org.apache.catalina.connector.Request.getSession(Request.java:2066) at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:833) at org.jboss.seam.servlet.ServletRequestSessionMap.put(ServletRequestSessionMap.java:87) at org.jboss.seam.servlet.ServletRequestSessionMap.put(ServletRequestSessionMap.java:25) at org.jboss.seam.contexts.BasicContext.set(BasicContext.java:80) at org.jboss.seam.Component.newInstance(Component.java:1980) at org.jboss.seam.Component.getInstance(Component.java:1878) at org.jboss.seam.Component.getInstance(Component.java:1857) at org.jboss.seam.Component.getInstance(Component.java:1834) at org.jboss.seam.web.Session.getInstance(Session.java:122) at org.jboss.seam.contexts.Contexts.flushAndDestroyContexts(Contexts.java:375) at org.jboss.seam.contexts.Lifecycle.endRequest(Lifecycle.java:132) at org.jboss.seam.servlet.ContextualHttpServletRequest.run(ContextualHttpServletRequest.java:65) at org.jboss.seam.web.ContextFilter.doFilter(ContextFilter.java:37) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:141) at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:281) at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:150) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) 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:230) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619)
note: this is not urgent - the applet and the servlet (doPost()) work correctly
I just think, that this behaviour might indicate a (minor) bug in the filter, so maybe anyone of the SEAM team might check this
for SEAM users, who might be interested in getting rid of this exception, here is what I did:
I simply implemented the doGet method and return a plain/text:
then my applet still works, and my servlet does not throw this exception anymore
