Sbt 为什么触发任务中引发的异常不是'；在构建过程中没有报告？

具有以下生成定义文件和

sbt 0.13.1

：

name := "foobar"

val foo = taskKey[Unit]("foo")
val bar = taskKey[Unit]("bar")

foo := { println("foo") }

bar := { println("bar"); throw new Exception("bar exception") }

bar <<= bar triggeredBy foo

相反，当我直接执行

bar

任务时，中的异常会按预期报告：

$ sbt bar            
Loading /opt/local/sbt/bin/sbt-launch-lib.bash
[info] Loading global plugins from /home/s.savulchik/.sbt/0.13/plugins
[info] Loading project definition from /home/s.savulchik/projects/foobar/project
[info] Updating {file:/home/s.savulchik/projects/foobar/project/}foobar-build...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.
[info] Set current project to foobar (in build file:/home/s.savulchik/projects/foobar/)
bar
java.lang.Exception: bar exception
    at $df74d6ea1c7cfacc5a14$$anonfun$$sbtdef$1.apply(/home/s.savulchik/projects/foobar/build.sbt:8)
    at $df74d6ea1c7cfacc5a14$$anonfun$$sbtdef$1.apply(/home/s.savulchik/projects/foobar/build.sbt:8)
    at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:45)
    at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:45)
    at sbt.std.Transform$$anon$4.work(System.scala:64)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
    at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:18)
    at sbt.Execute.work(Execute.scala:244)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
    at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:160)
    at sbt.CompletionService$$anon$2.call(CompletionService.scala:30)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
[error] (*:bar) java.lang.Exception: bar exception
[error] Total time: 0 s, completed Mar 12, 2014 6:33:45 PM

非常感谢您的帮助！

---

谢谢。

正如@jsuereth评论的那样，这不是故意的行为，就是一个bug

似乎这一定是sbt错误…是的，这可能是sbt错误。你应该开一张罚单，我们会弄清楚UX应该是什么。我开了下面的罚单。

$ sbt bar            
Loading /opt/local/sbt/bin/sbt-launch-lib.bash
[info] Loading global plugins from /home/s.savulchik/.sbt/0.13/plugins
[info] Loading project definition from /home/s.savulchik/projects/foobar/project
[info] Updating {file:/home/s.savulchik/projects/foobar/project/}foobar-build...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.
[info] Set current project to foobar (in build file:/home/s.savulchik/projects/foobar/)
bar
java.lang.Exception: bar exception
    at $df74d6ea1c7cfacc5a14$$anonfun$$sbtdef$1.apply(/home/s.savulchik/projects/foobar/build.sbt:8)
    at $df74d6ea1c7cfacc5a14$$anonfun$$sbtdef$1.apply(/home/s.savulchik/projects/foobar/build.sbt:8)
    at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:45)
    at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:45)
    at sbt.std.Transform$$anon$4.work(System.scala:64)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
    at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:18)
    at sbt.Execute.work(Execute.scala:244)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
    at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:160)
    at sbt.CompletionService$$anon$2.call(CompletionService.scala:30)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
[error] (*:bar) java.lang.Exception: bar exception
[error] Total time: 0 s, completed Mar 12, 2014 6:33:45 PM