unable to delete directory from sbt

Question

I have written the following rule in sbt to delete a directory but the code doesn't delete the directory. What I am doing wrong?

def clearOldUiBuild(implicit dir:File):Boolean = {
  println(s"Deleting ui directory. Implicit directory ${dir}")
  val uiBuildDirectory = dir / "public/ui"
  println(s"ui build path ${uiBuildDirectory}")
  val directoryExists = uiBuildDirectory.exists() && uiBuildDirectory.isDirectory()
  println(s"ui exists? ${directoryExists}")
  if(directoryExists){
    println(s"deleting directory ${uiBuildDirectory}")
    val retExecutable = uiBuildDirectory.setExecutable(true)
    val retRead = uiBuildDirectory.setReadable(true)
    val retWrite = uiBuildDirectory.setWritable(true)
    println(s"set executable result ${retExecutable}, ${retRead}, ${retWrite}")
    val ret = uiBuildDirectory.delete()
    println(s"delete result ${ret}")
    ret
  } else {
    println(s"directory doesn't exist")
    true
  }
}

output

[IJ][projectname] $ clear-old-ui-build
Deleting ui directory. Implicit directory C:...frontendweb
ui build path C:...frontendwebpublicui

ui exists? true
deleting directory C:..ui
set executable result true, true, false
delete result false
[trace] Stack trace suppressed: run 'last *:clearOldUiBuild' for the full output.
[error] (*:clearOldUiBuild) java.lang.Exception: Oops! UI Build crashed.
[error] Total time: 0 s, completed 08-Jan-2021 18:26:44


[IJ][myproject] $ last *:clearOldUiBuild
java.lang.Exception: Oops! UI Build crashed.
        at $6ac9788b23c613fff84d$$anonfun$$sbtdef$1.apply(C:...frontendwebuild.sbt:341)
        at $6ac9788b23c613fff84d$$anonfun$$sbtdef$1.apply(C:...uild.sbt:339)
        at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
        at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40)
        at sbt.std.Transform$$anon$4.work(System.scala:63)
        at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
        at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
        at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
        at sbt.Execute.work(Execute.scala:237)
        at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
        at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
        at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)
        at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
[error] (*:clearOldUiBuild) java.lang.Exception: Oops! UI Build crashed.

Answer 1

等待大神答复