In web.xml, I have the following configurations for a global error page.
<error-page>
<error-code>401</error-code>
<location>/WEB-INF/error_pages/GeneralError.xhtml</location>
</error-page>
<error-page>
<error-code>403</error-code>
<location>/WEB-INF/error_pages/GeneralError.xhtml</location>
</error-page>
<error-page>
<error-code>404</error-code>
<location>/WEB-INF/error_pages/GeneralError.xhtml</location>
</error-page>
<error-page>
<error-code>500</error-code>
<location>/WEB-INF/error_pages/GeneralError.xhtml</location>
</error-page>
<error-page>
<error-code>503</error-code>
<location>/WEB-INF/error_pages/GeneralError.xhtml</location>
</error-page>
When any exception occurs (that result in 500 internal server error), the request is expected to be dispatched to the error page specified but when an exception occurs, the page which is being processed is just left blank in half way through. It does not forward to the error page.
Configuring java.lang.Throwable or java.lang.Exception as follows,
<error-page>
<exception-type>java.lang.Throwable</exception-type>
<location>/WEB-INF/error_pages/GeneralError.xhtml</location>
</error-page>
also did not help anymore.
The full contents of web.xml :
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
<context-param>
<param-name>javax.faces.FACELETS_LIBRARIES</param-name>
<param-value>/WEB-INF/my.taglib.xml</param-value>
</context-param>
<context-param>
<param-name>javax.faces.DATETIMECONVERTER_DEFAULT_TIMEZONE_IS_SYSTEM_TIMEZONE</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Production</param-value>
</context-param>
<context-param>
<param-name>com.sun.faces.enableViewStateIdRendering</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>com.sun.faces.enableRestoreView11Compatibility</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>server</param-value>
</context-param>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/log4j.properties</param-value>
</context-param>
<context-param>
<param-name>log4jExposeWebAppRoot</param-name>
<param-value>false</param-value>
</context-param>
<filter>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<filter-class>org.primefaces.webapp.filter.FileUploadFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
</filter-mapping>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.xhtml</url-pattern>
</servlet-mapping>
<error-page>
<error-code>401</error-code>
<location>/WEB-INF/error_pages/GeneralError.xhtml</location>
</error-page>
<error-page>
<error-code>403</error-code>
<location>/WEB-INF/error_pages/GeneralError.xhtml</location>
</error-page>
<error-page>
<error-code>404</error-code>
<location>/WEB-INF/error_pages/GeneralError.xhtml</location>
</error-page>
<error-page>
<error-code>500</error-code>
<location>/WEB-INF/error_pages/GeneralError.xhtml</location>
</error-page>
<error-page>
<error-code>503</error-code>
<location>/WEB-INF/error_pages/GeneralError.xhtml</location>
</error-page>
<error-page>
<exception-type>java.lang.Throwable</exception-type>
<location>/WEB-INF/error_pages/GeneralError.xhtml</location>
</error-page>
<security-constraint>
<display-name>AdminConstraint</display-name>
<web-resource-collection>
<web-resource-name>ROLE_ADMIN</web-resource-name>
<description/>
<url-pattern>/admin_side/*</url-pattern>
</web-resource-collection>
<auth-constraint>
<description/>
<role-name>ROLE_ADMIN</role-name>
</auth-constraint>
<user-data-constraint>
<description/>
<transport-guarantee>CONFIDENTIAL</transport-guarantee>
</user-data-constraint>
</security-constraint>
<security-constraint>
<display-name>UserConstraint</display-name>
<web-resource-collection>
<web-resource-name>ROLE_USER</web-resource-name>
<description/>
<url-pattern>/user_side/*</url-pattern>
</web-resource-collection>
<auth-constraint>
<description/>
<role-name>ROLE_USER</role-name>
</auth-constraint>
<user-data-constraint>
<description/>
<transport-guarantee>CONFIDENTIAL</transport-guarantee>
</user-data-constraint>
</security-constraint>
<login-config>
<auth-method>FORM</auth-method>
<realm-name>projectRealm</realm-name>
<form-login-config>
<form-login-page>/utility/Login.xhtml</form-login-page>
<form-error-page>/utility/ErrorPage.xhtml</form-error-page>
</form-login-config>
</login-config>
<security-role>
<description/>
<role-name>ROLE_ADMIN</role-name>
</security-role>
<security-role>
<description/>
<role-name>ROLE_USER</role-name>
</security-role>
<!--error-page>
<exception-type>javax.faces.application.ViewExpiredException</exception-type>
<location>/utility/Login.xhtml</location>
</error-page-->
<session-config>
<session-timeout>
120
</session-timeout>
<tracking-mode>COOKIE</tracking-mode>
</session-config>
<welcome-file-list>
<welcome-file>utility/Login.xhtml</welcome-file>
</welcome-file-list>
</web-app>
Also tried on a blank project with only a single XHTML page and nothing other than error page configurations in web.xml. Pages are merely left blank half way through instead of forwarding to the error page, when an exception occurs (among other HTTP status, only 404 works).
How to dispatch to a specified error page, when any exception/error occurs?
Update 1 :
According to this question/answer, I added the context parameter javax.faces.FACELETS_BUFFER_SIZE to web.xml to have 64KB buffer size but nothing new happened. It still does not forward to the error page, if an exception occurs. Pages are just partially processed and left blank in half way through, if an exception/error occurs. The exception stacktrace is only found on the server terminal and not on the web page (in case 500 internal server error). I deliberately make the application throw an exception to see, if it forwards to the error page.
Update 2 :
After setting the buffer size as mentioned in edit 1, I got the following exception at a certain time (when a request is redirected to a secured area after a successful login). So, I removed that parameter for now.
Severe: Error Rendering View[/utility/Login.xhtml]
java.lang.IllegalStateException
at org.apache.catalina.connector.ResponseFacade.setBufferSize(ResponseFacade.java:285)
at com.sun.faces.context.ExternalContextImpl.setResponseBufferSize(ExternalContextImpl.java:923)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.createResponseWriter(FaceletViewHandlingStrategy.java:1162)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:403)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:344)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:72)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at filter.LoginNocacheFilter.doFilter(LoginNocacheFilter.java:39)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:415)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282)
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
at java.lang.Thread.run(Thread.java:745)
Info: Exception when handling error trying to reset the response.
java.lang.IllegalStateException
at org.apache.catalina.connector.ResponseFacade.setBufferSize(ResponseFacade.java:285)
at com.sun.faces.context.ExternalContextImpl.setResponseBufferSize(ExternalContextImpl.java:923)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.createResponseWriter(FaceletViewHandlingStrategy.java:1162)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:403)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:344)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:72)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at filter.LoginNocacheFilter.doFilter(LoginNocacheFilter.java:39)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:415)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282)
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
at java.lang.Thread.run(Thread.java:745)
Update 3 :
I tried to increase the buffer size (100002400 that's too much) until the error java.lang.OutOfMemoryError: Java heap space is issued. Therefore, the output buffer size should not be the problem.
In Ajaxical things, error pages by the way, are correctly rendered on errors during asynchronous requests by means of OmniFaces - org.omnifaces.exceptionhandler.FullAjaxExceptionHandlerFactory configured in faces-config.xml.
Perhaps, it could have been possible to see the cause of the problem, if I had configured error pages in the beginning - when I started the application and the application consequently had no much extra overhead that it currently has with many XHTML pages, CDI managed beans, EJB session beans etc but anyway I overwhelmed it.
Update 4:
I am now running the same application on WildFly 9.0.2 final. The problem remains unchanged.
Check by increasing the size of your error page GeneralError.xhtml. Sometimes the server doesn't display the error page if it is smaller in size. i.e. try adding some more 50-100 lines of text to GeneralError.xhtml and check)
来源：https://stackoverflow.com/questions/26741693/pages-being-processed-are-merely-left-blank-half-way-through-on-errors-exception