Issue Summary

When using Jira >=8 on Java 11, a warning message is logged due to an illegal reflection operation by the Apache Felix Framework (org.apache.felix.framework) to method java.net.URLClassLoader.addURL

The issue is tracked on Apache Felix at https://issues.apache.org/jira/browse/FELIX-5765

Steps to Reproduce

1. Start a Jira 8.5.2 instance on Java 11
2. Observe the error messages in the startup logs (catalina.out)

Expected Results

No warnings are shown in the log

Actual Results

The below warning is shown in the catalina.out file:

    ___ Starting the JIRA Plugin System _________________
    
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.felix.framework.ext.ClassPathExtenderFactory$DefaultClassLoaderExtender (file:/Users/allewellyn/jira/atlassian-jira-software-8.5.2-standalone/atlassian-jira/WEB-INF/lib/org.apache.felix.framework-5.6.12.jar) to method java.net.URLClassLoader.addURL(java.net.URL)
WARNING: Please consider reporting this to the maintainers of org.apache.felix.framework.ext.ClassPathExtenderFactory$DefaultClassLoaderExtender
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

There is no currently identified appreciable effect on Jira, but, there may be in a future release of Java (All illegal access operations will be denied in a future release)

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available