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• A recent version of IntelliJ. These steps have been validated on IntelliJ 2020.2.2

• JDK 1.8 installed and configured in IntelliJ

• A local git clone of the apache/beam repository in your home directory ("~/beam")

• ChromeDriver installed and running (chromedriver --port=4444)
• Flutter installed
• Dart installed (version >=3.0.2 <4.0.0)
• The script local-env-setup.sh (Located at the root of the project)ran before importing the project

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When building the project with IntelliJ, you may encounter some issues, here is the fix for each issue:

Flutter finished with non-zero exit value 1:

When you get this issue, you should make sure that ChromeDriver is installed and running with the command chromedriver --port=4444 and duplicate or rename the file config.example.dart to config.g.dart in the folder playground/frontend/lib.

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1. Make sure to set the language as the following screen shot (The class Module is only available starting from Java 9+) 
   
2. Clean & rebuild the project

3. Try invalidating the IntelliJ cache and restarting the IDE, using File > Invalidate caches/ restart

4. Delete the .idea  & .gradle project and rebuild or reimport the project

Can't resolve generated AutoValue classes AutoValue_*:

To fix this issue, you should enable annotation processing in IntelliJ. For that, you will need to go 

File → Settings → Build, Execution, Deployment → Compiler → Annotation Processors

And check "Enable annotation processing" as in the following image.

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After that, you will need to run the build of that specific module. If for example, you want to work on "ElasticsearchIO", you will need to open gradle sidebar, 

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beam → Tasks → sdks → io → elasticsearch

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