Codegen fails when command contains field with argGroup annotation (4.0.1)

[eomeara]

Sample argGroup code in documentation causes codegen to fail during gradle build.
Also don't know why warning is present.
Sample project attached.

build.gradle.kts

plugins {
    `java-library`
}

repositories {
    mavenLocal()
    maven {
        url = uri("http://repo.maven.apache.org/maven2")
    }
}

dependencies {
    implementation("info.picocli:picocli-spring-boot-starter:4.0.1")
    annotationProcessor("info.picocli:picocli-codegen:4.0.1")
}

MutuallyExclusiveOptionsDemo.java

package bug.codegen.ArgGroup;

import picocli.CommandLine.*;

@Command(name = "exclusivedemo")
public class MutuallyExclusiveOptionsDemo {

    @ArgGroup(exclusive = true, multiplicity = "1")
    Exclusive exclusive;

    static class Exclusive {
        @Option(names = "-a", required = true) int a;
        @Option(names = "-b", required = true) int b;
        @Option(names = "-c", required = true) int c;
    }
}

Gradle console output

.\gradlew clean build

> Task :compileJava FAILED
warning: Supported source version 'RELEASE_6' from annotation processor 'org.gradle.api.internal.tasks.compile.processing.TimeTrackingProcessor' less than -source '1.8'
C:\Users\auser\Documents\args-bug\src\main\java\bug\codegen\ArgGroup\MutuallyExclusiveOptionsDemo.java:9: error: @ArgGroups must be enclosed in a @Command or @ArgGroup-annotated element, but was bug.codegen.ArgGroup.MutuallyExclusiveOptionsDemo: MutuallyExclusiveOptionsDemo
    Exclusive exclusive;
              ^
Note: ReflectConfigGen writing to: CLASS_OUTPUT/META-INF/native-image/picocli-generated/reflect-config.json
Note: ResourceConfigGen writing to: CLASS_OUTPUT/META-INF/native-image/picocli-generated/resource-config.json
Note: ProxyConfigGen writing to: CLASS_OUTPUT/META-INF/native-image/picocli-generated/proxy-config.json
1 error
1 warning

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s
2 actionable tasks: 1 executed, 1 up-to-date

args-bug.zip

[remkop]

Thanks for reporting this!
This looks like a bug in the annotation processor. I’ll take a look.

[remkop]

I was able to reproduce the problem. There are several issues with argument groups in the annotation processor. I am looking at how to address this.

About the warning: The picocli annotation processor is compiled with Java 6, and by default has a supported source version of RELEASE_6. Looking at this StackOverflow question, there may not much that can be done about it. I agree this is annoying.

[remkop]

It took a while, but I pushed a fix for this issue to master.
It would be great if you can confirm.

I will add some more tests and hope to do a 4.0.2 release with this fix later this week.

[remkop]

Fixed in master.
@eomeara It would be great if you could confirm. The easiest way to do this is to check out the project in git, then run gradlew publishToMavenLocal on the command line. (Or gradlew -x check publishToMavenLocal to skip the tests.)

After that you can use the picocli-4.0.2-SNAPSHOT dependency in your project.

[eomeara]

Will try to check this evening. Was on bank holiday weekend Saturday to Monday.

[eomeara]

My build now succeeds and all tests pass. In future I intend to move my code to GraalVM, though not yet.
Using the annotation processor is my first step.
P.S. Thanks for a great library.

[remkop]

Thank you for the confirmation!