Scala - What is this NoSuchMethodError telling me?

Question

I get a NoSuchMethodError when I run my unit test. My Scala code compiles, so why does it fail to find a method during runtime?

java.lang.NoSuchMethodError: com.twitter.algebird.Analytics$.mean(Lscala/Function2;)Lscala/Function1;

What does the (Lscala/Function2;) and Lscala/Function1; mean?

The second question is a duplicate of https://stackoverflow.com/questions/8343593/understanding-method-signature-in-nosuchmethod-exception — Chris Martin, Jul 17 '15 at 22:23
When using incremental build (like in IntelliJ IDE) it can also mean a broken build after some signature change. A full Rebuild fixes this. — Suma, Jul 18 '15 at 14:47

score 1 · Answer 1 · answered Jul 18 '15 at 13:42

1

This usually indicates that you are using a binary incompatible library, e.g. your dependencies don't match (you have library A version X and library B that assumes library A version Y).

If you build with sbt, you can run sbt evicted that will give you warnings about possibly incompatible libraries.

answered Jul 18 '15 at 13:42

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If you're using maven you can look at `mvn dependency:tree`, or eclipse has a nice UI for seeing what pulls in a particular library. – lmm Jul 20 '15 at 09:07

Scala - What is this NoSuchMethodError telling me?

1 Answers1