Adaptivist ScriptRunner uses groovy language which is based on Java platform. That is why you can use pure Java instead of groovy in scriptrunner. Anyway in the end you have to call Bitbucket Java API.
Searching through the documentation of Bitbucket Java API all the time can influence on your productivity that is why it is better if you setup development environment as it is guided here:
After this setup you can develop in IntelliJ and have hints for Bitbucket Java API.
Also it is important to mention that scriptrunner is a plugin which gives developers an easier access to bitbucket extensions which were made by bitbucket developers.
This access is given by entry points (pre-recieve hooks, post-recieve hooks etc) which are documented here.
After you get into an entry point you can use Bitbucket Java API.
Here is the reference to Bitbucket Java API
You can find the documentation for ScriptRunner for Bitbucket on this link
The scripting language ScriptRunner uses is Groovy.
You can learn more about it on this link
There are other online resources for groovy scripting as well, but the above would be beneficial if you are a beginner to start you off.
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