RFR [9] 8160513: ClassNotFoundException sun.misc.GC when running Tomcat 9 with JDK 9

[Chris Hegarty]

The GC.Daemon thread has no need of any user defined class loader,
so should set its context class loader to null before starting, so as to
not inadvertently retain a reference to the creating thread’s context
class loader.

http://cr.openjdk.java.net/~chegar/8160513/
https://bugs.openjdk.java.net/browse/JDK-8160513

-Chris.

P.S. I added a detailed comment the JIRA issue, for those wondering
why Tomcat is running into this.