How to return to a previous plugin version?

[Georg Potthast]

For testing I create a plugin, e.g. mytest: “gradlew 
createPlugin -PpluginId=mytest”. To be able to fall back to a working 
version, I frequently copy this plugin directory to e.g. mytest-1, mytest-2 
etc. When I decide to use the mytest-1 directory again, I rename the 
directory I am currently working with to mytest-current and copy mytest-1 to 
mytest. Then I restart ofbiz and expect that to work with this mytest 
directory.

However, OFBiz seems to continue to work with the former current directory. 
E.g. I have made three menu items in mytest-current while I had just two 
menu items in the older mytest-1 directory. After copying the mytest-1 
directory to mytest and restarting OFBiz, I still have three menu items 
displayed although there should be only two.

What could be the reason for this and what do I have to do to properly fall 
back to the state of mytest-1?