https://bz.apache.org/bugzilla/show_bug.cgi?id=69675

            Bug ID: 69675
           Summary: Please include threadName in WebappClassLoaderBase
                    clearReferencesThreads log content
           Product: Tomcat 9
           Version: 9.0.98
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Catalina
          Assignee: dev@tomcat.apache.org
          Reporter: felixzhang0...@gmail.com
  Target Milestone: -----

Background : 
1, In WebappClassLoaderBase, we have logic to log call stack trace of threads
that processing http requests. 
if (isRequestThread(thread)) {
    log.warn(sm.getString("webappClassLoader.stackTraceRequestThread",
getContextName(), threadName,
            getStackTrace(thread)));
} else {
    log.warn(sm.getString("webappClassLoader.stackTrace", getContextName(),
threadName,
            getStackTrace(thread)));
}

2, The log content comes from LocalStrings.properties
webappClassLoader.stackTraceRequestThread=The web application [{0}] is still
processing a request that has yet to finish. This is very likely to create a
memory leak. You can control the time allowed for requests to finish by using
the unloadDelay attribute of the standard Context implementation. Stack trace
of request processing thread:[{2}]

3, The log line in WebappClassLoaderBase already provided threadName parameter.
Just the local string is not using it.

Requirement : 
Could you please enhance the string properties
webappClassLoader.stackTraceRequestThread to include threadName information in
log.

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