从Gradle Fat Jar加载Kotlin主类失败

如何解决从Gradle Fat Jar加载Kotlin主类失败

基于此处的其他答案，我正在使用此Gradle构建通过我的命令行工具和许多JDBC驱动程序来创建一个胖/超级/阴影的Jar：

import org.gradle.jvm.tasks.Jar

dependencies {
    api(project(":db2xls"))
    api("ch.qos.logback:logback-classic:1.2.3")
    api("com.h2database:h2:1.4.200")
    api("org.postgresql:postgresql:42.2.16")
    api("MysqL:mysql-connector-java:8.0.21")
    api("com.microsoft.sqlserver:mssql-jdbc:8.4.1.jre11")
}

val fatJar = task("fatJar",type = Jar::class) {
    manifest {
        attributes["Implementation-Title"] = "DB2XLS Bundle"
        attributes["Implementation-Version"] = "0.1-SNAPSHOT"
        attributes["Main-Class"] = "de.peterbecker.xls.Db2XlsKt"
    }
    from(
        configurations.compile.get().map { if (it.isDirectory) it else zipTree(it) },configurations.runtimeClasspath.get().map { if (it.isDirectory) it else zipTree(it) }
    )
    with(tasks.jar.get() as copySpec)
}

tasks {
    "build" {
        dependsOn(fatJar)
    }
}

该版本会生成一个JAR文件，当使用ZIP工具进行检查时看起来不错，但无法执行：

$ java -jar db2xls-bundle-0.1-SNAPSHOT.jar 
Error: Could not find or load main class de.peterbecker.xls.Db2XlsKt
Caused by: java.lang.classNotFoundException: de.peterbecker.xls.Db2XlsKt

如果我改用类路径，也是如此：

$ java -cp db2xls-bundle-0.1-SNAPSHOT.jar de.peterbecker.xls.Db2XlsKt
Error: Could not find or load main class de.peterbecker.xls.Db2XlsKt
Caused by: java.lang.classNotFoundException: de.peterbecker.xls.Db2XlsKt

该类文件似乎在那里，

$ jar -t --file db2xls-bundle-0.1-SNAPSHOT.jar  | grep Db2XlsKt
de/peterbecker/xls/Db2XlsKt$logger$1.class
de/peterbecker/xls/Db2XlsKt$processQuery$1.class
de/peterbecker/xls/Db2XlsKt$toLists$$inlined$use$lambda$1.class
de/peterbecker/xls/Db2XlsKt.class

正常的JAR似乎找到了按预期加载的类（然后由于缺乏依赖而失败）：

$ java -cp db2xls-0.1-SNAPSHOT.jar de.peterbecker.xls.Db2XlsKt
Error: Unable to initialize main class de.peterbecker.xls.Db2XlsKt
Caused by: java.lang.NoClassDefFoundError: kotlin/NowhenBranchMatchedException

我在做什么错了？

完整的代码位于https://github.com/peterbecker/xls-utils/tree/fat_jar