HTTP Status 500 - Cannot call sendError() after the response has been committed

[Jim Sprague]

I keep getting this error when trying to connect to a (new) Production Database through the web installer for Confluence. I've read several threads here for similar issues, though not specifically for the one I'm experiencing.

Here's what I've tried thus far:

- Installed app on two different servers with different OS (Windows 2012 Server and Windows 2016) with the exact same errors (see below).
- Change default ports from 8000/8090 to 8002/8092
- Tried installing the demo only with the internally generated database

I get the same error regardless of how I approach the install. Any suggestions based off the error logs? I am aware that this is the result of a symptom, not the symptom itself, but I don't have much to go on at this point. Thanks!
_________________________________________________________________

HTTP Status 500 – Internal Server Error

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Type Exception Report

Message Cannot call sendError() after the response has been committed

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

java.lang.IllegalStateException: Cannot call sendError() after the response has been committed
	org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:456)
	javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:120)
	com.atlassian.confluence.web.filter.DebugFilter$LoggingResponseWrapper.sendError(DebugFilter.java:132)
	javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:120)
	com.atlassian.confluence.servlet.FourOhFourErrorLoggingFilter$1.sendError(FourOhFourErrorLoggingFilter.java:52)
	javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:120)
	com.atlassian.core.filters.HeaderSanitisingResponseWrapper.sendError(HeaderSanitisingResponseWrapper.java:89)
	javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:120)
	javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:120)
	com.opensymphony.webwork.dispatcher.ServletDispatcher.sendError(ServletDispatcher.java:349)
	com.atlassian.confluence.servlet.ConfluenceServletDispatcher.sendError(ConfluenceServletDispatcher.java:104)
	com.atlassian.confluence.servlet.ConfluenceServletDispatcher.serviceAction(ConfluenceServletDispatcher.java:97)
	com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:199)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	com.atlassian.confluence.util.profiling.ProfilingSiteMeshFilter.doFilter(ProfilingSiteMeshFilter.java:55)
	com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:51)
	com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:45)
	com.atlassian.johnson.plugin.servlet.filter.JohnsonServletFilterModuleContainerFilter.doFilter(JohnsonServletFilterModuleContainerFilter.java:50)
	com.atlassian.confluence.jmx.JmxFilter.doFilter(JmxFilter.java:98)
	com.atlassian.confluence.cache.TransactionalCacheFactoryCleanupFilter.doFilter(TransactionalCacheFactoryCleanupFilter.java:22)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.core.filters.ServletContextThreadLocalFilter.doFilter(ServletContextThreadLocalFilter.java:17)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.util.UserLoggingContextFilter.doFilter(UserLoggingContextFilter.java:32)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.util.UserNameHeaderFilter.doFilter(UserNameHeaderFilter.java:25)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.web.filter.MauEventFilter.doFilter(MauEventFilter.java:42)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.util.UserThreadLocalFilter.doFilter(UserThreadLocalFilter.java:39)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.web.filter.ConfluenceTimeoutFilter.doFilter(ConfluenceTimeoutFilter.java:57)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:88)
	com.atlassian.confluence.web.filter.ConfluenceSecurityFilter.applyFilter(ConfluenceSecurityFilter.java:39)
	com.atlassian.confluence.web.filter.ConfluenceSecurityFilter.doFilter(ConfluenceSecurityFilter.java:29)
	com.atlassian.confluence.web.filter.ThreadLocalCacheFilter.doFilter(ThreadLocalCacheFilter.java:25)
	com.atlassian.confluence.util.AbstractBootstrapHotSwappingFilter$SwapOnBootstrapFilter.doFilter(AbstractBootstrapHotSwappingFilter.java:45)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.util.AbstractBootstrapHotSwappingFilter.doFilter(AbstractBootstrapHotSwappingFilter.java:35)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.seraph.filter.BaseLoginFilter.doFilter(BaseLoginFilter.java:148)
	com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:51)
	com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:45)
	com.atlassian.johnson.plugin.servlet.filter.JohnsonServletFilterModuleContainerFilter.doFilter(JohnsonServletFilterModuleContainerFilter.java:50)
	com.atlassian.confluence.util.ClusterHeaderFilter.doFilter(ClusterHeaderFilter.java:56)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.web.filter.ConfluenceOpenSessionInViewFilter.doFilterInternal(ConfluenceOpenSessionInViewFilter.java:38)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	com.atlassian.confluence.util.ConfluenceErrorFilter.doFilter(ConfluenceErrorFilter.java:24)
	com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:99)
	com.atlassian.confluence.core.datetime.RequestTimeThreadLocalFilter.doFilter(RequestTimeThreadLocalFilter.java:37)
	com.atlassian.core.filters.cache.AbstractCachingFilter.doFilter(AbstractCachingFilter.java:31)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:51)
	com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:45)
	com.atlassian.johnson.plugin.servlet.filter.JohnsonServletFilterModuleContainerFilter.doFilter(JohnsonServletFilterModuleContainerFilter.java:50)
	com.atlassian.confluence.tenant.TenantGateFilter.lambda$doFilter$0(TenantGateFilter.java:35)
	com.atlassian.confluence.tenant.TenantGate$3.call(TenantGate.java:145)
	com.atlassian.confluence.tenant.TenantGateFilter.doFilter(TenantGateFilter.java:37)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.util.MobileAppRequestFilter.doFilter(MobileAppRequestFilter.java:36)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.internal.web.filter.spring.IgnoreWebAsyncManagerFilter.doFilter(IgnoreWebAsyncManagerFilter.java:59)
	com.atlassian.confluence.web.filter.validateparam.RequestParamValidationFilter.doFilter(RequestParamValidationFilter.java:51)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.web.filter.TranslationModeFilter.doFilter(TranslationModeFilter.java:39)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.plugin.servlet.filter.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:72)
	com.atlassian.confluence.web.filter.LanguageExtractionFilter.doFilter(LanguageExtractionFilter.java:39)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.impl.vcache.VCacheRequestContextFilter.doFilter(VCacheRequestContextFilter.java:58)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.util.LoggingContextFilter.doFilter(LoggingContextFilter.java:33)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.util.RequestCacheThreadLocalFilter.doFilter(RequestCacheThreadLocalFilter.java:65)
	com.atlassian.confluence.web.filter.ZipkinTracingFilter.doFilter(ZipkinTracingFilter.java:54)
	com.atlassian.confluence.web.filter.ResponseOutputStreamFilter.doFilter(ResponseOutputStreamFilter.java:25)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.johnson.filters.AbstractJohnsonFilter.doFilter(AbstractJohnsonFilter.java:59)
	com.atlassian.confluence.web.ConfluenceJohnsonFilter.doFilter(ConfluenceJohnsonFilter.java:32)
	com.atlassian.core.filters.encoding.AbstractEncodingFilter.doFilter(AbstractEncodingFilter.java:39)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.confluence.impl.servlet.HoldingUntilStartedFilter.doFilter(HoldingUntilStartedFilter.java:88)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)
	com.atlassian.core.filters.HeaderSanitisingFilter.doFilter(HeaderSanitisingFilter.java:37)
	com.atlassian.confluence.servlet.FourOhFourErrorLoggingFilter.doFilter(FourOhFourErrorLoggingFilter.java:64)
	com.atlassian.confluence.internal.diagnostics.HttpRequestMonitoringFilter.doFilter(HttpRequestMonitoringFilter.java:35)
	com.atlassian.confluence.web.filter.DebugFilter.doFilter(DebugFilter.java:46)
	com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32)