We are using a custom plugin in Bitbucket 7.x version currently. While trying to upgrade to Bitbucket 8.x we are see an error. This plugin is using/expecting the package: com.atlassian.utils.process in the error as show below:
The package com.atlassian.utils.process is deprecated in 8.x
It depends on what you are doing exactly. For me I used SingleLineOutputHandler which uses com.atlassian.bitbucket.io now