playframework - Incremental compile errors after java class modifications -


i have relatively large playframework application causing headaches. basically, every often, following exception:

java.io.filenotfoundexception: c:\...\source\target\scala-2.10\classes.bak\sbt81130890495 478.class (access denied)         @ java.io.fileoutputstream.open(native method)         @ java.io.fileoutputstream.<init>(fileoutputstream.java:221)         @ java.io.fileoutputstream.<init>(fileoutputstream.java:171)         @ sbt.using$$anonfun$fileoutputchannel$1.apply(using.scala:75)         @ sbt.using$$anonfun$fileoutputchannel$1.apply(using.scala:75)         @ sbt.using$$anon$2.openimpl(using.scala:65)         @ sbt.openfile$class.open(using.scala:43)         @ sbt.using$$anon$2.open(using.scala:64)         @ sbt.using$$anon$2.open(using.scala:64)         @ sbt.using.apply(using.scala:23)         @ sbt.io$$anonfun$copyfile$3.apply(io.scala:586)         @ sbt.io$$anonfun$copyfile$3.apply(io.scala:585)         @ sbt.using.apply(using.scala:24)         @ sbt.io$.copyfile(io.scala:585)         @ sbt.io$.move(io.scala:786)         @ sbt.inc.classfilemanager$$anonfun$transactional$1$$anon$2.sbt$inc$classfilemanager$$anonfun$$anon$$move(classfilemanager.scala:75)         @ sbt.inc.classfilemanager$$anonfun$transactional$1$$anon$2$$anonfun$delete$3.apply(classfilemanager.scala:52)         @ sbt.inc.classfilemanager$$anonfun$transactional$1$$anon$2$$anonfun$delete$3.apply(classfilemanager.scala:51)         @ scala.collection.immutable.hashset$hashset1.foreach(hashset.scala:153)         @ scala.collection.immutable.hashset$hashtrieset.foreach(hashset.scala:306)         @ scala.collection.immutable.hashset$hashtrieset.foreach(hashset.scala:306)         @ sbt.inc.classfilemanager$$anonfun$transactional$1$$anon$2.delete(classfilemanager.scala:51)         @ sbt.inc.incremental$.prune(incremental.scala:82)         @ sbt.inc.incrementalcommon.cycle(incrementalcommon.scala:28)         @ sbt.inc.incremental$$anonfun$1.apply(incremental.scala:62)         @ sbt.inc.incremental$$anonfun$1.apply(incremental.scala:61)         @ sbt.inc.incremental$.manageclassfiles(incremental.scala:89)         @ sbt.inc.incremental$.compile(incremental.scala:61)         @ sbt.inc.incrementalcompile$.apply(compile.scala:54)         @ sbt.compiler.ic$.compileinternal(incrementalcompiler.scala:160)         @ sbt.compiler.ic$.incrementalcompile(incrementalcompiler.scala:138)         @ sbt.compiler$.compile(compiler.scala:128)         @ sbt.compiler$.compile(compiler.scala:114)         @ sbt.defaults$.sbt$defaults$$compileincrementaltaskimpl(defaults.scala:814)         @ sbt.defaults$$anonfun$compileincrementaltask$1.apply(defaults.scala:805)         @ sbt.defaults$$anonfun$compileincrementaltask$1.apply(defaults.scala:803)         @ scala.function1$$anonfun$compose$1.apply(function1.scala:47)         @ sbt.$tilde$greater$$anonfun$$u2219$1.apply(typefunctions.scala:40)         @ sbt.std.transform$$anon$4.work(system.scala:63)         @ sbt.execute$$anonfun$submit$1$$anonfun$apply$1.apply(execute.scala:226)         @ sbt.execute$$anonfun$submit$1$$anonfun$apply$1.apply(execute.scala:226)         @ sbt.errorhandling$.wideconvert(errorhandling.scala:17)         @ sbt.execute.work(execute.scala:235)         @ sbt.execute$$anonfun$submit$1.apply(execute.scala:226)         @ sbt.execute$$anonfun$submit$1.apply(execute.scala:226)         @ sbt.concurrentrestrictions$$anon$4$$anonfun$1.apply(concurrentrestrictions.scala:159)         @ sbt.completionservice$$anon$2.call(completionservice.scala:28)         @ java.util.concurrent.futuretask.run(futuretask.java:262)         @ java.util.concurrent.executors$runnableadapter.call(executors.java:471)         @ java.util.concurrent.futuretask.run(futuretask.java:262)         @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1145)         @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:615)         @ 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 denied) [error] total time: 18 s, completed 28-apr-2015 5:26:55 pm

once error occurs, occur every time try compile. have clean compile , takes 25 minutes on computer.

i've tried googling can't m haven't had luck. think occurs if modifying source while running given 1 of supposed benefits of play... well, suck.

i running windows 7 play 2.3.8.


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