jibBuildTar is wrongly UP-TO-DATE

Environment:

• Jib version: 3.2.1
• Build tool: Gradle
• OS: MacOS, M1

Description of the issue: The jibBuildTar is UP-TO-DATE although the compileJava task is not.

Expected behavior:

• Changes to the code will cause the jibBuildTar to not be UP-TO-DATE

Steps to reproduce:

1. Change code
2. ./gradlew jibBuildTar
3. Change code again
4. ./gradlew jibBuildTar => UP-TO-DATE

build.gradle.kts

plugins {
    java
    id("com.google.cloud.tools.jib")
}

jib {
    from {
        image = "openjdk:11-jre-slim"
    }
}

settings.gradle.kts

rootProject.name = "jib-reproducer"

pluginManagement {
    plugins {
        id("com.google.cloud.tools.jib") version "3.2.1"
    }
}

Log output:

Run 1:

> Task :compileJava
Caching disabled for task ':compileJava' because:
  Build cache is disabled
Task ':compileJava' is not up-to-date because:
  Output property 'destinationDirectory' file /Users/yannick/IdeaProjects/jib-r?producer/build/classes/java/main has been removed.
  Output property 'destinationDirectory' file /Users/yannick/IdeaProjects/jib-r?producer/build/classes/java/main/org has been removed.
  Output property 'destinationDirectory' file /Users/yannick/IdeaProjects/jib-r?producer/build/classes/java/main/org/test has been removed.
The input changes require a full rebuild for incremental task ':compileJava'.
Full recompilation is required because no incremental change information is available. This is usually caused by clean builds or changing compiler arguments.
Compiling with toolchain '/Library/Java/JavaVirtualMachines/zulu-11.jdk/Contents/Home'.
Compiling with JDK Java compiler API.
Class dependency analysis for incremental compilation took 0.0 secs.
Created classpath snapshot for incremental compilation in 0.0 secs.
:compileJava (Thread[Execution worker for ':',5,main]) completed. Took 0.036 secs.
:processResources (Thread[Execution worker for ':',5,main]) started.

> Task :processResources NO-SOURCE
Skipping task ':processResources' as it has no source files and no previous output files.
:processResources (Thread[Execution worker for ':',5,main]) completed. Took 0.0 secs.
:classes (Thread[Execution worker for ':',5,main]) started.

> Task :classes
Skipping task ':classes' as it has no actions.
:classes (Thread[Execution worker for ':',5,main]) completed. Took 0.0 secs.
:jibBuildTar (Thread[Execution worker for ':',5,main]) started.

> Task :jibBuildTar
Caching disabled for task ':jibBuildTar' because:
  Build cache is disabled
Task ':jibBuildTar' is not up-to-date because:
  Implementation of input property 'jib.from.platforms.$0' has changed for task ':jibBuildTar'
  Value of input property 'jib.from.platforms.$0.architecture' has changed for task ':jibBuildTar'
Tagging image with generated image reference jib-reproducer:latest. If you'd like to specify a different tag, you can set the jib.to.image parameter in your build.gradle, or use the --image=<MY IMAGE> commandline flag.
Searching for main class... Add a 'mainClass' configuration to 'jib' to improve build speed.
Could not find a valid main class from 'jar' task; looking into all class files to infer main class.

Run 2:

> Task :compileJava
Caching disabled for task ':compileJava' because:
  Build cache is disabled
Task ':compileJava' is not up-to-date because:
  Input property 'stableSources' file /Users/yannick/IdeaProjects/jib-r?producer/src/main/java/org/test/Main.java has changed.
Created classpath snapshot for incremental compilation in 0.0 secs.
Compiling with toolchain '/Library/Java/JavaVirtualMachines/zulu-11.jdk/Contents/Home'.
Compiling with JDK Java compiler API.
Incremental compilation of 1 classes completed in 0.009 secs.
Class dependency analysis for incremental compilation took 0.0 secs.
:compileJava (Thread[Execution worker for ':',5,main]) completed. Took 0.015 secs.
:processResources (Thread[Execution worker for ':',5,main]) started.

> Task :processResources NO-SOURCE
Skipping task ':processResources' as it has no source files and no previous output files.
:processResources (Thread[Execution worker for ':',5,main]) completed. Took 0.0 secs.
:classes (Thread[Execution worker for ':',5,main]) started.

> Task :classes
Skipping task ':classes' as it has no actions.
:classes (Thread[Execution worker for ':',5,main]) completed. Took 0.0 secs.
:jibBuildTar (Thread[Execution worker for ':',5,main]) started.

> Task :jibBuildTar UP-TO-DATE
Caching disabled for task ':jibBuildTar' because:
  Build cache is disabled
Skipping task ':jibBuildTar' as it is up-to-date.
:jibBuildTar (Thread[Execution worker for ':',5,main]) completed. Took 0.0 secs.

[chanseokoh]

Yeah, looks like this is an easily reproducible bug.

[SgtSilvio]

classes is a lifecycle task (https://docs.gradle.org/current/userguide/more_about_tasks.html#sec:lifecycle_tasks) and never executes, it only “combines” tasks (in this case compileJava and processResources).

Did you really make a meaningful change to the code?

Yes, see this line:

Task ':compileJava' is not up-to-date because:
  Input property 'stableSources' file /Users/yannick/IdeaProjects/jib-r?producer/src/main/java/org/test/Main.java has changed.