在 IntelliJ IDEA 中创建 Java Gradle 项目并构建 .jar 文件 - 如何？

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:

Answer 2

Just incase you run into no main manifest attribute problem where the executable Jar file is not running, I do the following.

1: go to your build.gradle and add the following at the bottom.

jar {
    manifest {
        attributes 'Main-Class': 'your_package_name.YOUR_MAIN_CLASS'
    }
    from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
}

2. go to View > Tool Windows > Gradle

3. A panel at the right side will be shown, now click the build for more task. Under the build task double click the build option and wait until the task is done.

5. Now, go to your project directory and open the build > libs and the executable Jar file will be there.

I'm not sure if this is the right way.
No need to accept if it works, hope this help the others.

Answer 3

Step 1 : Add these lines on your build.gradle

jar {
from {
    configurations.runtime.collect {
        it.isDirectory() ? it : zipTree(it)
    }
    configurations.compile.collect {
        it.isDirectory() ? it : zipTree(it)
    }
}
manifest {
    attributes 'Main-Class': 'YOUR MAIN CLASS'
}

exclude 'META-INF/*.RSA', 'META-INF/*.SF','META-INF/*.DSA'
}

Step 2: clean and build .

I'm sure it will work, Regards

Answer 4

If you are using Intellij you can just open the Gradle plugin (it is on the right side of your IDE) and execute a command: bootRepackage. With this you will have a jar in: your_project_folder/build/libs.