contextVersion NullPointerException due to race condition
Not sure this is the right mailing list or that it should go to dev. One of our unit tests will occasionally have a null pointer exception durin= g shutdown. Unfortunately I have not been able to create a small reproducti= on yet. The scenario is as follows. * SpringApplicationShutdownHook calls Tomcat.stop() and a contextVersio= n used by a SSE request is removed through MapperListener.unregisterContext * A tomcat thread processes an IOException ("Connection reset by peer")= exception for that SSE request and ends up in Mapper.map() and gets a null= result from contextObjectToContextVersionMap.get(context). In the end this causes = a NullPointerException in internalMapWrapper when calling contextVersion.path.length() This seems to be only in Tomcat 10.1.12+. Tomcat 10.1.11 does not have the = problem. Regards, Patrick This email and any attachments are intended solely for the use of the individual or entity to whom it is addressed and may be confidential and/or privileged. If you are not one of the named recipients or have received this email in error, (i) you should not read, disclose, or copy it, (ii) please notify sender of your receipt by reply email and delete this email and all attachments, (iii) Dassault Syst?mes does not accept or assume any liability or responsibility for any use of or reliance on this email. Please be informed that your personal data are processed according to our data privacy policy as described on our website. Should you have any questions related to personal data protection, please contact 3DS Data Protection Officer https://www.3ds.com/privacy-policy/contact/
How to properly enable logging in "org.apache.catalina.core.StandardContext"
In our SpringBoot services, we sometimes run into situations where we get an exception like this: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat It doesn't provide any meaningful root cause. I've googled how to get more verbosity from this, but the results are so varied and often conflicting, and I've never found a strategy that works. It appears that the logger used in Catalina is not directly compatible with logback, or I'm not figuring out the correct logger name to use. I was finally able to figure out why this particular failure was happening, but that was by carefully stepping through the code and finding new breakpoints to drill down further. I saw references to the "juli" framework for logging, which I had seen mentioned in the threads that talk about getting these logs, but I was never able to get it to work. As opposed to using my serious debugging skills, I'd like to figure out how to simply increase the Tomcat logging levels so we can get better information.