NullpointerException when compiling my project

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Dirceu Semighini Filho

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May 20, 2016, 5:14:10 PM5/20/16

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Hi all,

I work with a project on top of Apache Spark, totally written in Scala and today I start receiving some NullPointerException when compiling the project.

unhandled exception while transforming ClassName.scala

[error] uncaught exception during compilation: java.lang.NullPointerException

I use scala 2.10.6 (I was using 2.10.5 and updated after the error), and sbt 0.13.11 (also updated it from 0.13.9 after this start happening)

JVM 1.8 b91

In Intellij Idea the project compile fine, but in sbt it doesn't, it throws a NullPointerException

My first shot was to compile it in another workstation, but the error remains.

Debugging the compiler I found that some of my matches wasn't working, code like this

properties.toMap.map {
            f =>
//            case (key, value) =>

The commented line throws the exception, and to fix it I'll have to modify it to f =>

My problem is that I have a lot of this cases into my code, and changing every one will be a nightmare.

I can't tell which change I've done in code to start throwing this errors.

Does anybody has a clue on what should be throwing this exception?

The NullPointerException stack trace is:

java.lang.NullPointerException

at scala.tools.nsc.transform.patmat.MatchCodeGen$OptimizedCodegen$optimizedCodegen$.matcher(MatchCodeGen.scala:162)

at scala.tools.nsc.transform.patmat.MatchTreeMaking$TreeMakers$class.combineCasesNoSubstOnly(MatchTreeMaking.scala:547)

at scala.tools.nsc.transform.patmat.PatternMatching$OptimizingMatchTranslator.combineCasesNoSubstOnly(PatternMatching.scala:87)

at scala.tools.nsc.transform.patmat.MatchTranslation$MatchTranslator$class.translateTry(MatchTranslation.scala:192)

at scala.tools.nsc.transform.patmat.PatternMatching$OptimizingMatchTranslator.translateTry(PatternMatching.scala:87)

at scala.tools.nsc.transform.patmat.PatternMatching$MatchTransformer.transform(PatternMatching.scala:70)

at scala.tools.nsc.transform.patmat.PatternMatching$MatchTransformer.transform(PatternMatching.scala:55)

at scala.reflect.internal.Trees$class.itransform(Trees.scala:1238)

at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:13)

at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2897)

at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:48)

at scala.tools.nsc.transform.patmat.PatternMatching$MatchTransformer.transform(PatternMatching.scala:71)

at scala.tools.nsc.transform.patmat.PatternMatching$MatchTransformer.transform(PatternMatching.scala:55)

at scala.reflect.internal.Trees$$anonfun$itransform$3.apply(Trees.scala:1251)

at scala.reflect.api.Trees$Transformer.atOwner(Trees.scala:2936)

at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:34)

at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:28)

at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.atOwner(TypingTransformers.scala:19)

at scala.reflect.internal.Trees$class.itransform(Trees.scala:1250)

at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:13)

at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2897)

at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:48)

at scala.tools.nsc.transform.patmat.PatternMatching$MatchTransformer.transform(PatternMatching.scala:71)

at scala.tools.nsc.transform.patmat.PatternMatching$MatchTransformer.transform(PatternMatching.scala:55)

at scala.reflect.api.Trees$Transformer$$anonfun$transformTrees$1.apply(Trees.scala:2900)

at scala.collection.immutable.List.loop$1(List.scala:170)

at scala.collection.immutable.List.mapConserve(List.scala:186)

at scala.reflect.api.Trees$Transformer.transformTrees(Trees.scala:2900)

at scala.reflect.internal.Trees$class.itransform(Trees.scala:1219)

at scala.reflect.internal.SymbolTable.itransform(SymbolTable.scala:13)

at scala.reflect.api.Trees$Transformer.transform(Trees.scala:2897)

at scala.tools.nsc.transform.TypingTransformers$TypingTransformer.transform(TypingTransformers.scala:48)

at scala.tools.nsc.transform.patmat.PatternMatching$MatchTransformer.transform(PatternMatching.scala:71)

at scala.tools.nsc.transform.patmat.PatternMatching$MatchTransformer.transform(PatternMatching.scala:55)

at scala.reflect.internal.Trees$class.itransform(Trees.scala:1217)