Warnings when stopping Tomcat

Mark Thomas

2018-09-11 18:03:25 UTC

I’m sure this has been asked/answered before so just point me to where I can read up on it.

https://svn.apache.org/viewvc/tomcat/trunk/bin/catalina.sh?annotate=1835115#l302

I see these written to the console of my Tomcat window which I start by running java and using org.apache.catalina.startup.Bootstrap as the main class.

You won't see those warnings if you start Tomcat with the standard scripts.

2018/09/11 10:14:52.135 | INFO: Stopping service [Catalina]
2018/09/11 10:14:52.135 | WARNING: An illegal reflective access operation has occurred
2018/09/11 10:14:52.135 | WARNING: Illegal reflective access by org.apache.catalina.loader.WebappClassLoaderBase (file:/usr/local/apache-tomcat-9.0.12/lib/catalina.jar) to field java.io.ObjectStreamClass$Caches.localDescs
2018/09/11 10:14:52.135 | WARNING: Please consider reporting this to the maintainers of org.apache.catalina.loader.WebappClassLoaderBase
2018/09/11 10:14:52.135 | WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
2018/09/11 10:14:52.135 | WARNING: All illegal access operations will be denied in a future release
Are there plans to address these in a future release?

Not at the moment.

We'll keep the explicit clearing in place as long as we can. Once it is
permanently blocked we'll probably have to rely on the fact that the
Maps in question use a WeakReference and wait for GC to clear the
references. That will make tracking down genuine memory leaks harder so
we'll have to see if we can persuade the JRE team to provide some sort
of replacement API if/when we reach that point.

Mark

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