Creating a Java Gradle project and building the .jar file in IntelliJ IDEA - How to?

Question

Is there a tutorial explaining how to properly create a Java Gradle project and build the .jar file?

When I create a Java project and add Gradle: File -> New -> Module -> Gradle -> ... I receive errors about Java EE websocket's not available (I'm using Ultimate Edition). However, I can successfully create a project by selecting File -> New -> Project-> Gradle -> which gives me a Java project with Gradle that I can debug. However, when I try to create an artifact (.jar file) I receive errors. I assume the errors stem from mistakes I made in the project structure settings.

Buildfile: build.xml does not exist!
Build failed

or

Error: Could not find or load main class Main

My project is such a mess at this point, maybe I should create another project, then copy/paste the Main.class and Gradle's dependencies from the old project onto the new project.

If this is my best option, how do I correctly create the project this time?

Answer 1

1. Create new Gradle (not Java) project. Be sure to select Java option in the dialog. Click Next.

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2. fill GroupId, ArtifactId and version

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3. Choose your gradle distribution. You can safely use the reccommended option.

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4. Choose project name and location

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5. Click finish

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6. You put your java classes to src/main/java folder. When using third party libraries, make sure you declare them as Gradle dependencies.

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7. You build your sources using Gradle tab → tasks → build (double click)

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8. You can see the result of the build in the Run tab

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9. In case of error, you can see details by clicking the following button: