Fix crash when uploading a file too quickly

When clicking on the "upload" button of the richfaces component, whereas the file is not uploaded yet, conversation might be lost and page crashes:

2009-07-07 00:08:52,866 DEBUG (http-127.0.0.1-8080-2) [SeamPhaseListener] committing transaction after phase: INVOKE_APPLICATION 5
2009-07-07 00:08:52,866 DEBUG (http-127.0.0.1-8080-2) [timing] [TIMING] - [1ms] : Execution time for phase (including any PhaseListeners) -> INVOKE_APPLICATION 5
2009-07-07 00:08:52,867 DEBUG (http-127.0.0.1-8080-2) [SeamPhaseListener] beginning transaction prior to phase: RENDER_RESPONSE 6
2009-07-07 00:08:52,867 DEBUG (http-127.0.0.1-8080-2) [context] Adding Message[sourceId=<<NONE>>,summary=The conversation ended, timed out or was processing another request)
2009-07-07 00:08:52,870 WARN (http-127.0.0.1-8080-2) [TreeActionsBean] Could not initialize the navigation tree: no parent found for current document
2009-07-07 00:08:52,896 DEBUG (http-127.0.0.1-8080-5) [ManagedConnectionImpl] cleanup: org.nuxeo.ecm.core.storage.sql.ra.ManagedConnectionImpl@7b6275f2
2009-07-07 00:08:52,897 DEBUG (http-127.0.0.1-8080-5) [timing] [TIMING] - [1178ms] : Execution time for phase (including any PhaseListeners) -> RENDER_RESPONSE 6
2009-07-07 00:08:52,927 WARN (http-127.0.0.1-8080-2) [LockActionsBean] Can't evaluate lock action : currentDocument is null
2009-07-07 00:08:52,956 ERROR (http-127.0.0.1-8080-2) [DocumentContextInvalidatorInterceptor] Unable to get CurrentDocument
2009-07-07 00:08:52,957 ERROR (http-127.0.0.1-8080-2) [DocumentContextInvalidatorInterceptor] Unable to get CurrentDocument
2009-07-07 00:08:52,965 WARN (http-127.0.0.1-8080-2) [DeleteActionsBean] Null currentDocument in navigationContext
2009-07-07 00:08:53,132 ERROR (http-127.0.0.1-8080-2) [viewhandler] Error Rendering View[/view_documents.xhtml]
com.sun.facelets.tag.TagAttributeException: /incl/tabs/document_view.xhtml @43,45 test="#

{!empty selectedSections}" /incl/tabs/document_view.xhtml @43,45 tes
t="#{!empty selectedSections}

": /incl/tabs/document_view.xhtml @42,106 value="#

{publishActions.getPublishingInfo().toArray()}": java.lang.NullPointerException
at com.sun.facelets.tag.TagAttribute.getObject(TagAttribute.java:235)
at com.sun.facelets.tag.TagAttribute.getBoolean(TagAttribute.java:79)
at com.sun.facelets.tag.jstl.core.IfHandler.apply(IfHandler.java:49)
at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
at com.sun.facelets.tag.jsf.ComponentHandler.applyNextHandler(ComponentHandler.java:295)
at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:165)
at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
at com.sun.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:49)
at com.sun.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:25)
at org.nuxeo.theme.jsf.facelets.vendor.DefaultFacelet.include(DefaultFacelet.java:248)
at org.nuxeo.theme.jsf.facelets.vendor.DefaultFacelet.include(DefaultFacelet.java:289)
at org.nuxeo.theme.jsf.facelets.vendor.DefaultFacelet.include(DefaultFacelet.java:271)
at org.nuxeo.theme.jsf.facelets.vendor.DefaultFaceletContext.includeFacelet(DefaultFaceletContext.java:129)
at com.sun.facelets.tag.ui.IncludeHandler.apply(IncludeHandler.java:60)
at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
at com.sun.facelets.tag.ui.DefineHandler.apply(DefineHandler.java:58)
at org.nuxeo.theme.jsf.facelets.CompositionHandler.apply(CompositionHandler.java:169)
at org.nuxeo.theme.jsf.facelets.vendor.DefaultFaceletContext$TemplateManager.apply(DefaultFaceletContext.java:278)
at org.nuxeo.theme.jsf.facelets.vendor.DefaultFaceletContext.includeDefinition(DefaultFaceletContext.java:250)
at com.sun.facelets.tag.ui.InsertHandler.apply(InsertHandler.java:68)
at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
at com.sun.facelets.tag.jsf.core.ViewHandler.apply(ViewHandler.java:109)
at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
at com.sun.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:49)
at com.sun.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:25)
at org.nuxeo.theme.jsf.facelets.vendor.DefaultFacelet.include(DefaultFacelet.java:248)
at org.nuxeo.theme.jsf.facelets.vendor.DefaultFacelet.include(DefaultFacelet.java:289)
at org.nuxeo.theme.jsf.facelets.vendor.DefaultFaceletContext.includeFacelet(DefaultFaceletContext.java:205)
at org.nuxeo.theme.jsf.facelets.CompositionHandler.apply(CompositionHandler.java:151)
at com.sun.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:49)
at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47)
at com.sun.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:25)
at org.nuxeo.theme.jsf.facelets.vendor.DefaultFacelet.apply(DefaultFacelet.java:99)
at com.sun.facelets.FaceletViewHandler.buildView(FaceletViewHandler.java:510)
at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:553)
at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)
at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:109)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at org.nuxeo.ecm.platform.ui.web.lifecycle.NuxeoLifeCycleImpl.render(NuxeoLifeCycleImpl.java:98)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)
at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:347)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:495)
at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)
at org.jboss.seam.servlet.SeamFilter$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.servlet.SeamFilter.doFilter(SeamFilter.java:158)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.nuxeo.ecm.platform.ui.web.rest.FancyURLFilter.doFilter(FancyURLFilter.java:131)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.nuxeo.ecm.platform.ui.web.auth.NuxeoAuthenticationFilter.doFilter(NuxeoAuthenticationFilter.java:461)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.nuxeo.ecm.platform.web.common.requestcontroller.filter.NuxeoRequestControllerFilter.doFilter(NuxeoRequestControllerFilter.java:115)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.nuxeo.ecm.platform.web.common.exceptionhandling.NuxeoExceptionFilter.doFilter(NuxeoExceptionFilter.java:77)
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:182)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
at java.lang.Thread.run(Thread.java:595)
Caused by: javax.el.ELException: /incl/tabs/document_view.xhtml @43,45 test="#{!empty selectedSections}": /incl/tabs/document_view.xhtml @42,106 value="#{publishActions.getPublishingInfo().toArray()}

": java.lang.NullPointerException
at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:76)
at com.sun.facelets.tag.TagAttribute.getObject(TagAttribute.java:233)
... 89 more
Caused by: java.lang.NullPointerException
at org.nuxeo.ecm.platform.publishing.PublishActionsBean.getPublishingInfo(PublishActionsBean.java:709)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.seam.util.Reflections.invoke(Reflections.java:21)
at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:31)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:46)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:166)
at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:102)
at org.nuxeo.ecm.platform.publishing.PublishActionsBean_$$javassist_62.getPublishingInfo(PublishActionsBean$$_javassist_62.java)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:329)
at org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:274)
at org.jboss.el.parser.AstMethodSuffix.getValue(AstMethodSuffix.java:59)
at org.jboss.el.parser.AstValue.getValue(AstValue.java:67)
at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)
at org.jboss.el.parser.AstIdentifier.getValue(AstIdentifier.java:40)
at org.jboss.el.parser.AstEmpty.getValue(AstEmpty.java:29)
at org.jboss.el.parser.AstNot.getValue(AstNot.java:26)
at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)
... 90 more
2009-07-07 00:08:53,134 ERROR (http-127.0.0.1-8080-2) [lifecycle] JSF1054: (Phase ID: RENDER_RESPONSE 6, View ID: /view_documents.xhtml) Exception thrown during phase execution: javax.faces.event.PhaseEvent[source=com.sun.faces.lifecycle.LifecycleImpl@a46f7ef]
2009-07-07 00:08:53,135 DEBUG (http-127.0.0.1-8080-2) [SeamPhaseListener] rolling back transaction after phase: RENDER_RESPONSE 6