A suprising log I noticed on JIRA startup today:

2020-07-11 14:18:29,465+1000 JIRA-Bootstrap ERROR      [c.k.j.p.keplercf.admin.KCFLauncher] Cannot copy the JSP. Error was:java.io.FileNotFoundException: /opt/atlassian/redradish_jira/8.10.0/atlassian-jira/secure/popups/ksil_userpicker.jsp (Permission denied)
java.io.FileNotFoundException: /opt/atlassian/redradish_jira/8.10.0/atlassian-jira/secure/popups/ksil_userpicker.jsp (Permission denied)
        at java.base/java.io.FileOutputStream.open0(Native Method)
        at java.base/java.io.FileOutputStream.open(FileOutputStream.java:298)
        at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:237)
        at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:187)
        at com.keplerrominfo.jira.plugins.keplercf.admin.KCFLauncher.copyJSPFile(KCFLauncher.java:346)
        at com.keplerrominfo.jira.plugins.keplercf.admin.KCFLauncher.launch(KCFLauncher.java:188)
        at com.keplerrominfo.refapp.launcher.AbstractDependentPluginLauncher.tryToLaunch(AbstractDependentPluginLauncher.java:139)
        at com.keplerrominfo.refapp.launcher.AbstractDependentPluginLauncher.handleEvent(AbstractDependentPluginLauncher.java:85)
        at com.keplerrominfo.jira.plugins.keplercf.admin.KCFLauncher.onPluginEvent(KCFLauncher.java:215)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at com.atlassian.event.internal.SingleParameterMethodListenerInvoker.invoke(SingleParameterMethodListenerInvoker.java:42)
        at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.lambda$null$0(AsynchronousAbleEventDispatcher.java:37)
        at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.dispatch(AsynchronousAbleEventDispatcher.java:85)
        at com.atlassian.event.internal.LockFreeEventPublisher$Publisher.dispatch(LockFreeEventPublisher.java:220)
        at com.atlassian.event.internal.LockFreeEventPublisher.publish(LockFreeEventPublisher.java:96)
...
2020-07-11 12:26:36,465+1000 UpmAsynchronousTaskManager:thread-2 ERROR jturner 736x198x1 1uhj4pl 127.0.0.1 /rest/plugins/1.0/updates/all [c.k.j.p.keplercf.admin.KCFLauncher] You must manually copy the ksil_userpicker.jsp file into the correct directory (read the manual). Destination path: JIRA-HOME/atlassian-jira/secure/popups/ksil_userpicker.jsp