Question

我在我的mutliproject Gradle构建中遇到了一种奇怪的行为。有问题的项目是开源的，所以那些想要深入了解构建的人欢迎在分支开发上查看here。

在父项目中，我定义了fatJar任务，如下所示：

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奇怪，因为它使用了ANTLR（我省略了依赖关系和其他我认为不需要理解手头问题的代码）。

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，当从父项目中运行./gradlew clean && ./gradlew fatJar时，我遇到了一个失败，出现以下异常（为简洁起见省略了一些部分）：

> 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)

系统抱怨的文件实际上是文件夹，实际上是一个文件夹，但它确实应该是。现在，让我感到困惑的是，如果第二次调用./gradlew fatJar，它就会成功完成。这在不同的系统上是可重现的，改变了Gradle版本（保留在版本4.x）和操作系统（Arch Linux和MacOS X）。

Gradle在清理后无法在antlr sourceset上创建胖jar，否则成功

0 个答案: