[ https://issues.jboss.org/browse/JBSEAM-5143?page=com.atlassian.jira.plugi... ] Robert Becker updated JBSEAM-5143: ---------------------------------- Description: Since upgrading to Seam 2.3 with Mojarra 2.1.29 on glassfish v3 from Seam 2.2.2, I get random IllegalArgumentExceptions with the message "Stack must not be null". The application worked fine for several years until now. The full stack trace is listed here: http://pastebin.com/RjLndvnE The exception randomly happens (in about 1 of 100 requests) when navigating between pages, submitting forms, switching (RichFaces) tabs and so on. I believe restarting glassfish and/or enabling client side state saving reduces the frequency of the issue whereas it seems to happen more often after multiple successive redeployments during development. I have also posted this on stackoverflow (http://stackoverflow.com/questions/27107870/seam-2-3-illegalargumentexcep...) but have not received any answers yet. Besides Seam 2.3, the following libraries are used: - Mojarra 2.1.29 - RF 4.5 (exception also occurred with 4.3.x) - Omnifaces 1.10RC1 (will upgrade to 2.0) - Primefaces 5.1 was: Since upgrading to Seam 2.3 with Mojarra 2.1.29 on glassfish v3 from Seam 2.2.2, I get random IllegalArgumentExceptions with the message "Stack must not be null". Perhaps this is related to No long-running conversations - IllegalArgumentException: Stack must not be null, but I really don't know what I am doing wrong. The application worked fine for several years until now. The full stack trace is listed here: http://pastebin.com/RjLndvnE The exception randomly happens (in about 1 of 100 requests) when navigating between pages, submitting forms, switching (RichFaces) tabs and so on. I believe restarting glassfish and/or enabling client side state saving reduces the frequency of the issue whereas it seems to happen more often after multiple successive redeployments during development. I have also posted this on stackoverflow (http://stackoverflow.com/questions/27107870/seam-2-3-illegalargumentexcep...) but have not received any answers yet. Besides Seam 2.3, the following libraries are used: - Mojarra 2.1.29 - RF 4.5 (exception also occurred with 4.3.x) - Omnifaces 1.10RC1 (will upgrade to 2.0) - Primefaces 5.1 -- This message was sent by Atlassian JIRA (v6.3.8#6338)