Compiling Lift with -Ydelambdafy:method fails

[Andreas Joseph Krogh]

Hi all.

 

I'm trying to compile Lift with the following options to enable class-file generation using java8-lambdas:

 

// Added to build.sbt

scalaVersion in ThisBuild          := "2.11.7"

crossScalaVersions in ThisBuild    := Seq("2.11.7")

scalacOptions in ThisBuild := Seq("-Ydelambdafy:method", "-Ybackend:GenBCode", "-target:jvm-1.8")

libraryDependencies in ThisBuild ++= Seq("org.scala-lang.modules" %% "scala-java8-compat" % "0.5.0")

 

AFAIU this should be sufficient to make scalac generate java8 specific byte-code taking advantage of "native lambdas" using java-1.8.

 

It fails to compile however, yielding this error:

 

[warn] /home/andreak/dev/lift/framework/core/common/src/main/scala/net/liftweb/common/LRU.scala:108: Could not find any member to link for "NullPointerException".scala.tools.asm.tree.analysis.AnalyzerException: Execution can fall off end of the code
       at scala.tools.asm.tree.analysis.Analyzer.findSubroutine(Analyzer.java:314)
       at scala.tools.asm.tree.analysis.Analyzer.findSubroutine(Analyzer.java:330)
       at scala.tools.asm.tree.analysis.Analyzer.findSubroutine(Analyzer.java:330)
       at scala.tools.asm.tree.analysis.Analyzer.findSubroutine(Analyzer.java:330)
       at scala.tools.asm.tree.analysis.Analyzer.findSubroutine(Analyzer.java:330)
       at scala.tools.asm.tree.analysis.Analyzer.findSubroutine(Analyzer.java:330)
       at scala.tools.asm.tree.analysis.Analyzer.findSubroutine(Analyzer.java:330)
       at scala.tools.asm.tree.analysis.Analyzer.findSubroutine(Analyzer.java:330)
       at scala.tools.asm.tree.analysis.Analyzer.findSubroutine(Analyzer.java:330)
       at scala.tools.asm.tree.analysis.Analyzer.findSubroutine(Analyzer.java:330)
       at scala.tools.asm.tree.analysis.Analyzer.findSubroutine(Analyzer.java:330)
       at scala.tools.asm.tree.analysis.Analyzer.findSubroutine(Analyzer.java:330)
       at scala.tools.asm.tree.analysis.Analyzer.analyze(Analyzer.java:140)
       at scala.tools.nsc.backend.jvm.opt.LocalOptImpls$.removeUnreachableCodeImpl(LocalOpt.scala:196)
       at scala.tools.nsc.backend.jvm.opt.LocalOpt.removalRound$2(LocalOpt.scala:143)
       at scala.tools.nsc.backend.jvm.opt.LocalOpt.methodOptimizations(LocalOpt.scala:159)
       at scala.tools.nsc.backend.jvm.opt.LocalOpt$$anonfun$methodOptimizations$1.apply(LocalOpt.scala:94)
       at scala.tools.nsc.backend.jvm.opt.LocalOpt$$anonfun$methodOptimizations$1.apply(LocalOpt.scala:93)
       at scala.collection.TraversableOnce$$anonfun$foldLeft$1.apply(TraversableOnce.scala:155)
       at scala.collection.TraversableOnce$$anonfun$foldLeft$1.apply(TraversableOnce.scala:155)
       at scala.collection.Iterator$class.foreach(Iterator.scala:742)
       at scala.collection.AbstractIterator.foreach(Iterator.scala:1194)
       at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
       at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
       at scala.collection.TraversableOnce$class.foldLeft(TraversableOnce.scala:155)
       at scala.collection.AbstractTraversable.foldLeft(Traversable.scala:104)
       at scala.tools.nsc.backend.jvm.opt.LocalOpt.methodOptimizations(LocalOpt.scala:93)
       at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker2$$anonfun$localOptimizations$1.apply$mcZ$sp(GenBCode.scala:228)
       at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker2$$anonfun$localOptimizations$1.apply(GenBCode.scala:228)
       at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker2$$anonfun$localOptimizations$1.apply(GenBCode.scala:228)
       at scala.tools.nsc.backend.jvm.BackendStats$.timed(BackendStats.scala:22)
       at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker2.localOptimizations(GenBCode.scala:228)
       at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase$Worker2.run(GenBCode.scala:242)
       at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.buildAndSendToDisk(GenBCode.scala:350)
       at scala.tools.nsc.backend.jvm.GenBCode$BCodePhase.run(GenBCode.scala:316)
       at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1501)
       at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1486)
       at scala.tools.nsc.Global$Run.compileSources(Global.scala:1481)
       at scala.tools.nsc.Global$Run.compile(Global.scala:1582)
       at xsbt.CachedCompiler0.run(CompilerInterface.scala:116)
       at xsbt.CachedCompiler0.run(CompilerInterface.scala:95)
       at xsbt.CompilerInterface.run(CompilerInterface.scala:26)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
       at java.lang.reflect.Method.invoke(Method.java:497)
       at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:101)
       at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:47)
       at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:41)
       at sbt.compiler.MixedAnalyzingCompiler$$anonfun$compileScala$1$1.apply$mcV$sp(MixedAnalyzingCompiler.scala:51)
       at sbt.compiler.MixedAnalyzingCompiler$$anonfun$compileScala$1$1.apply(MixedAnalyzingCompiler.scala:51)
       at sbt.compiler.MixedAnalyzingCompiler$$anonfun$compileScala$1$1.apply(MixedAnalyzingCompiler.scala:51)
       at sbt.compiler.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:75)
       at sbt.compiler.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:50)
       at sbt.compiler.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:65)
       at sbt.compiler.IC$$anonfun$compileInternal$1.apply(IncrementalCompiler.scala:160)
       at sbt.compiler.IC$$anonfun$compileInternal$1.apply(IncrementalCompiler.scala:160)
       at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:66)
       at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:64)
       at sbt.inc.IncrementalCommon.cycle(IncrementalCommon.scala:31)
       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$2.call(CompletionService.scala:28)
       at java.util.concurrent.FutureTask.run(FutureTask.java:266)
       at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
       at java.util.concurrent.FutureTask.run(FutureTask.java:266)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
       at java.lang.Thread.run(Thread.java:745)

[warn]   /**
[warn]   ^
[error] Error while emitting net/liftweb/actor/SpecializedLiftActor$class
[error] Execution can fall off end of the code
[info] Done packaging.
[error] one error found
 

 

Has anyone successfully done this?

 

Thanks.

 

--

Andreas Joseph Krogh

CTO / Partner - Visena AS

Mobile: +47 909 56 963

and...@visena.com

www.visena.com