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I use Scala 2.10.0RC1 and sbt 0.12.1. What causes and how can I fix this runtime error (runs fine on 2.9.2)?
The exact error message is:
java.lang.NoSuchMethodError: scala.Predef$ArrowAssoc$.extension$$minus$greater(Ljava/lang/Object;Ljava/lang/Object;)Lscala/Tuple2;
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Dig into the do. something code, decompiling it if you don't have the source, and see what is actually thrown by it. Possibly if the exception gets thrown it might get wrapped in another exception. Make sure that anything thrown by the method does not get eaten (including by your own logging of it).
NoSuchMethodError is a runtime error in Java which occurs when a method is called that exists at compile-time, but does not exist at runtime. The Java Garbage Collector (GC) cannot free up the space required for a new object, which causes a java. lang.
lang. NoClassDefFoundError, which means the Class Loader file responsible for dynamically loading classes can not find the . class file. So to remove this error, you should set your classpath to the location where your Class Loader is present.
You're running the code with the wrong Scala version. This can have several causes:
sbt reboot
If you meticulously check all your sbt configuration files for 2.9.2 and then wipe out all caches, things should run better. Dependencies usually have a version number in the name of the jar file, so running a find on your system will likely point you to the ones you missed.
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