I am writing a jira server plugin with Atlassian SDK, and I want to develop the same plugin for Data Center. Are there any difference that need to be made, and if yes, which?
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However, Server apps have a remarkably similar list of things to look at. It's actually the same, just shorter!
There is a simple approach to this though - don't write your plugin for Server, write it for DC!
Whilst you can almost always install server apps on DC, you may run into problems if they are not coded for DC. But apps coded for DC generally work fine on Server. Not even just "we built a server version from the same code", but "we give you the same compiled plugin".
If you look at the marketplace and find an app that is for DC, download a version of it, and then download the same Server version, you will often find they're the same file.