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我在我的 mutliproject Gradle 构建中遇到了奇怪的行为。有问题的项目是开源的，所以欢迎那些想深入了解构建的人在这里查看，在分支开发上。

在父项目中，我定义了一个fatJar任务如下：

task fatJar(type: Jar, dependsOn: subprojects.compileJava) {
    manifest {
        attributes 'Implementation-Title': 'Alchemist',
        'Implementation-Version': rootProject.version,
        'Main-Class': 'it.unibo.alchemist.Alchemist'
    }
    baseName = "${rootProject.name}-redist"
    from(configurations.runtime.collect { it.isDirectory() ? it : zipTree(it) }) {
        // remove all signature files
        exclude "META-INF/*.SF"
        exclude "META-INF/*.DSA"
        exclude "META-INF/*.RSA"
        exclude 'build'
        exclude '.gradle'
        exclude 'build.gradle'
        exclude 'gradle'
        exclude 'gradlew'
        exclude 'gradlew.bat'
    }
    with jar
}

生成失败的一个子项目有点特殊，因为它使用了 ANTLR（我省略了依赖项和其他我认为对理解手头问题没有必要的代码）。

apply plugin: 'antlr'
sourceSets {
    antlr
}
generateGrammarSource {
    arguments += ["-visitor", "-package", "it.unibo.alchemist.biochemistrydsl"]
    def target = new File('src/antlr/java/')
    if ((target.exists() && target.isDirectory()) || target.mkdirs()) {
        outputDirectory = target
    } else {
        throw new IllegalStateException("$target is not an existing directory and could not be created as such.")
    }
}
compileAntlrJava.dependsOn('generateGrammarSource')
compileJava.dependsOn('compileAntlrJava')

现在，./gradlew clean && ./gradlew fatJar从父项目中运行时，我遇到了失败，但有以下异常（为简洁起见，省略了某些部分）：

> Failed to create MD5 hash for file '[my project folder]/alchemist/alchemist-incarnation-biochemistry/build/classes/java/antlr' as it does not exist.
* Exception is:
org.gradle.api.UncheckedIOException: Failed to capture snapshot of input files for task ':fatJar' property 'rootSpec$1$1' during up-to-date check.
        at org.gradle.api.internal.changedetection.state.CacheBackedTaskHistoryRepository.snapshotTaskFiles(CacheBackedTaskHistoryRepository.java:331)
<snip>
Caused by: org.gradle.api.UncheckedIOException: Failed to create MD5 hash for file '[my project folder]/alchemist/alchemist-incarnation-biochemistry/build/classes/java/antlr' as it does not exist.
        at org.gradle.internal.hash.DefaultFileHasher.hash(DefaultFileHasher.java:45)
<snip>
Caused by: java.io.FileNotFoundException: [my project folder]/alchemist/alchemist-incarnation-biochemistry/build/classes/java/antlr (Is a directory)
        at org.gradle.internal.hash.DefaultFileHasher.hash(DefaultFileHasher.java:38)

系统抱怨为文件夹的文件实际上存在并且实际上是一个文件夹，但它应该确实存在。现在，让我感到困惑的是，如果./gradlew fatJar第二次调用它，它就会成功完成。这可以在不同的系统上重现，不同的 Gradle 版本（保留在 4.x 版本上）和操作系统（Arch Linux 和 MacOS X）。

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