Http2 plugin installation may discard already installed ones

[syampol13]

Jmeter: 5.6.2

Observed that Http2 plugin installation may remove some already installed plugins. In my case I had jpgc-graphs-additional,jpgc-graphs-basic,jpgc-casutg installed. And all those were removed with the bzm http installation (without even corresponding warning in plugin-manager)

To reproduce:

1. Get pure Jmeter 5.6.2
2. Configure plugin manager and install jpgc-graphs-additional,jpgc-graphs-basic,jpgc-casutg plugins
   initial state
   
   plugins to install
   
3. Check plugins installed and available
   new thread groups are available
   
   new listeners are available
   
4. Install bzm-http2 plugin
   
5. Check previously installed pluging
   new thread groups from Cleanup http2 stream handler #3 are gone
   
   new listeners from Cleanup http2 stream handler #3 are available
   
   jpgc-casutg still shown as installed (but TG are not available). jpgc-graphs-additional,jpgc-graphs-basic disappeared from installed.
   

[diego-ferrand]

Hey @syampol13, thank you for reporting this. The issue is due to installation logic for http2 plugin. It manually upgrades jetty and all dependency used, they are all deleted and installed again which might cause some other plugins to be uninstalled.

With the plugins you identified, there is a shared dependency which is being uninstalled and installed by http2 plugin: jmeter-plugins-cmn-jmeter

This has been fixed and will be included in next release. For now, you can simply install the plugins again.