When users try to access alerts or process details for a process instance in /designer, they may run into an error in the UI like the following:
Users will also see the following error in the JBoss server.log:
java.lang.IllegalStateException: JBWEB002005: Header count exceeded allowed maximum 
The JBoss container limits the Mime Header count to 128 by default. This header count is related to how resources in the /designer interface are accessed.
To resolve the issue, perform the following:
<system-properties><property name="org.apache.tomcat.util.http.Parameters.MAX_COUNT" value="5000"/></system-properties>.
<property name="org.apache.tomcat.util.http.MimeHeaders.MAX_COUNT" value="512"/>.
This article applies to all versions of Appian using JBoss EAP 6.4.x as an application server.
Last Reviewed: April 2018
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