How to build IDEA IC's source code and debug it

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How to run and debug the IDEA IC from source code? 

I got the source code from git https://github.com/JetBrains/intellij-community and then run the getPlugins.bat

After synchronizing process of Gradle being done, I try to build/debug the code.  When I click build project or debug, the IDE built the source code automaticly but always fails halfway. I'm trying for this seveal days,  I don't know what is wrong.  It seems downloading many .jar file

from the web, but the synchronizing has already been finished why it still needs to download other .jar files? How can I fix this?

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Have you tried running the IDEA predefined run configuration?

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It is expected to download all required dependencies first before compilation starts.

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