Set up Gradle multi-project in IntelliJ to build JAR file
There were many places where I stumbled, so it's an amnesia.
- Confirmed with IntelliJ IDEA CE 2017.3.
Create a new project
Create a Gradle project.
Since it is a root project, uncheck all from "Additional libraries and frameworks".
Add shared project (module)
Right-click "Project View" in IntelliJ and select [New]-> [Module] from the context menu to add a shared module.
Here, check [Java] in "Additional libraries and frameworks"
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It seems like adding from the "Project Structure" window instead of from the "Project View". (For some reason, the parent project cannot be specified in the "Add as next module" field) 
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When the addition is complete, implement the appropriate common functions.
Add app module
Next, add the module that uses the common function in the same procedure.
When the addition is complete, add the shared module to dependecies in the" build.gradle "file and implement the appropriate functionality.
Next, set "Run / Debug Configuration" and check that it can be executed.
JAR file generation
In the default state, Gradle's output directory setting and IntelliJ's setting are different, so a normal JAR file is not generated.
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Reference: stack overfloe --Building with Intellij 2017.2 / out directory duplicates files in / build directory
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Therefore, explicitly specify the output directory in the "build.gradle" file of the shared module and app module.
Next, select [+]-> [JAR]-> [From Dependent Modules ...] from [Artifacts] in "Project Settings" in the "Project Structure" window to add the artifacts.
Change the manifest file directory from java to resources when specifying the module and main class.
Finally, make sure that the JAR file can be executed normally.
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