Set up Gradle multi-project in IntelliJ to build JAR file

There were many places where I stumbled, so it's an amnesia.

Create a new project

Create a Gradle project. Since it is a root project, uncheck all from "Additional libraries and frameworks". 01.png 02.png 03.png

Add shared project (module)

Right-click "Project View" in IntelliJ and select [New]-> [Module] from the context menu to add a shared module. 04.png

Here, check [Java] in "Additional libraries and frameworks" 05.png 06.png 07.png

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)
04B.png

When the addition is complete, implement the appropriate common functions. 08.png

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. 09.png

Next, set "Run / Debug Configuration" and check that it can be executed. 10.png 11.png

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.

Reference: stack overfloe --Building with Intellij 2017.2 / out directory duplicates files in / build directory 12B.png

Therefore, explicitly specify the output directory in the "build.gradle" file of the shared module and app module. 12.png

Next, select [+]-> [JAR]-> [From Dependent Modules ...] from [Artifacts] in "Project Settings" in the "Project Structure" window to add the artifacts. 13.png

Change the manifest file directory from java to resources when specifying the module and main class. 14.png

Finally, make sure that the JAR file can be executed normally. 15.png

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