我有一个相对较大的PlayFramework应用程序，导致令人头疼。基本上，每隔一段时间，我就会得到以下例外：
java.io.FileNotFoundException: C:\...\source\target\scala-2.10\classes.bak\sbt81130890495
478.class (Access is denied)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
at java.io.FileOutputStream.<init>(FileOutputStream.java:171)
at sbt.Using$$anonfun$fileOutputChannel$1.apply(Using.scala:75)
at sbt.Using$$anonfun$fileOutputChannel$1.apply(Using.scala:75)
at sbt.Using$$anon$2.openImpl(Using.scala:65)
at sbt.OpenFile$class.open(Using.scala:43)
at sbt.Using$$anon$2.open(Using.scala:64)
at sbt.Using$$anon$2.open(Using.scala:64)
at sbt.Using.apply(Using.scala:23)
at sbt.IO$$anonfun$copyFile$3.apply(IO.scala:586)
at sbt.IO$$anonfun$copyFile$3.apply(IO.scala:585)
at sbt.Using.apply(Using.scala:24)
at sbt.IO$.copyFile(IO.scala:585)
at sbt.IO$.move(IO.scala:786)
at sbt.inc.ClassfileManager$$anonfun$transactional$1$$anon$2.sbt$inc$ClassfileManager$$anonfun$$anon$$move(ClassfileManager.scala:75)
at sbt.inc.ClassfileManager$$anonfun$transactional$1$$anon$2$$anonfun$delete$3.apply(ClassfileManager.scala:52)
at sbt.inc.ClassfileManager$$anonfun$transactional$1$$anon$2$$anonfun$delete$3.apply(ClassfileManager.scala:51)
at scala.collection.immutable.HashSet$HashSet1.foreach(HashSet.scala:153)
at scala.collection.immutable.HashSet$HashTrieSet.foreach(HashSet.scala:306)
at scala.collection.immutable.HashSet$HashTrieSet.foreach(HashSet.scala:306)
at sbt.inc.ClassfileManager$$anonfun$transactional$1$$anon$2.delete(ClassfileManager.scala:51)
at sbt.inc.Incremental$.prune(Incremental.scala:82)
at sbt.inc.IncrementalCommon.cycle(IncrementalCommon.scala:28)
at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:62)
at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:61)
at sbt.inc.Incremental$.manageClassfiles(Incremental.scala:89)
at sbt.inc.Incremental$.compile(Incremental.scala:61)
at sbt.inc.IncrementalCompile$.apply(Compile.scala:54)
at sbt.compiler.IC$.compileInternal(IncrementalCompiler.scala:160)
at sbt.compiler.IC$.incrementalCompile(IncrementalCompiler.scala:138)
at sbt.Compiler$.compile(Compiler.scala:128)
at sbt.Compiler$.compile(Compiler.scala:114)
at sbt.Defaults$.sbt$Defaults$$compileIncrementalTaskImpl(Defaults.scala:814)
at sbt.Defaults$$anonfun$compileIncrementalTask$1.apply(Defaults.scala:805)
at sbt.Defaults$$anonfun$compileIncrementalTask$1.apply(Defaults.scala:803)
at scala.Function1$$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$$anonfun$apply$1.apply(Execute.scala:226)
at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226)
at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
at sbt.Execute.work(Execute.scala:235)
at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226)
at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226)
at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)
at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.Executors$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:745)
[error] (PLCM/compile:compileIncremental) java.io.FileNotFoundException: C:\...\source\ta
\scala-2.10\classes.bak\sbt811308904953346478.class (Access is denied)
[error] Total time: 18 s, completed 28-Apr-2015 5:26:55 PM
一旦发生此错误，每次我尝试编译时都会不断发生。我必须做一个干净的编译，我的电脑需要25分钟。
我试过谷歌搜索，但我没有运气。 我认为如果我在运行时修改源代码就会发生这种情况，但鉴于这是游戏的假设好处之一......好吧，这很糟糕。
我正在运行带有游戏2.3.8的Windows 7。