Enable Partial Compilation in IntelliJ IDEA

I'm working with 2020.2.3 version of IntelliJ.

I've tried all CrazyCoder's suggestions, but nothing works for me.

Eclipse Compiler + Build No-Error-Check

IntelliJ just refuses to Run anything (unit tests, main() methods...) because errors exist in the project. All I can say is that Eclipse is still working where IntelliJ remains blocked.

IntelliJ IDEA doesn't welcome working on the project that fails to compile, but there are several options:

• use Compile action from the file/folder context menu, disable Build in Run/Debug configuration.
• in the Before launch section of the Run/Debug configuration remove Build and add Build, no error check instead. Now start the configuration and it will ignore compilation errors trying to run on whatever classes managed to compile.

You should note that Make will fail on the first error and will not try to proceed further. In this case you should use explicit Compile action. Make also deletes output class files for the sources with errors.

If you want compilation to proceed after errors, you should switch to Eclipse compiler in IntelliJ IDEA Settings | Compiler | Java Compiler. When Eclipse compiler is selected, Proceed on errors option appears and it's enabled by default. With Eclipse compiler, an option to Proceed on errors enabled and Build, no error check in Before launch section you should get the desired behavior.

To make CrazyCoder comment more visible, if you go for the "proceed on errors" behavior you may want to uncheck

Settings | Compiler | Automatically show first error in editor.

Navigate to the Build menu at the bottom of your test editor, right-click on the folder that contains error messages that you find irrelevant.

Choose "Exclude from compile".