问题
I have a following function:
def removeLast(list: List[Int]): List[Int] = list match {
case List() => List()
case List(x) => List()
case x :: xs => x :: removeLast(xs)
}
When I define it and use it from the sbt console everything works just fine. But when I create a worksheet in Intellij IDEA and try to run it then the following exception appears:
java.lang.NoSuchMethodError: scala.collection.immutable.$colon$colon.hd$1()Ljava/lang/Object; at week5.A$A26$A$A26.removeLast(lists.sc8362409100671270508.tmp:30) at #worksheet#.#worksheet#(lists.sc8362409100671270508.tmp:33)
In addition, when I change last line to:
case x :: xs => 1 :: removeLast(xs)}
then it works.
What might the problem be?
回答1:
I had this issue. Agree with Andrzej, idea uses its own compiler, so you have to disable it somehow. Go to Settings->Scala->Worksheet and uncheck "Run worksheet in the compiler process".
回答2:
Any answer wasn't usefull in my case. Still i found a solution which worked for me.. It was problem with scalatest version. In pom.xml uprade to
<dependency>
<groupId>org.scalatest</groupId>
<artifactId>scalatest_2.11</artifactId>
<version>2.2.4</version>
<scope>test</scope>
</dependency>
helped
回答3:
So, although the above didn't solve my problem it is related to intellij.
Basically, it was preferring the Scala SDK to resolve the Class::method instead of loading from the dependencies.
I used
-verbose:class
in the JVM switch to have it show me where it was looking; immediately cluing me into it being because it's trying to load the class from the Scala SDK (it would expect it to pull in libs from Maven).
I literally just deleted the Scala SDK from my project settings and the problem went away. So far, my experience with Scala (and definitely in a mixed Java environment) leads me to believe it has a ways to go to mature. This is such a fundamental class/method I can't believe it vanished between versions. The scala version I had installed was 2.11. Apparently what get's pulled in is 2.10.4 from maven.
Anytime you see "NoSuchMethodError" it always means there is a version conflict; it's a question of why.
回答4:
Like others said here, I was having the same problem due I had some libraries using 2.10 in spite of having scalatest at 2.11.
<!-- http://www.scalactic.org/ -->
<dependency>
<groupId>org.scalactic</groupId>
<artifactId>scalactic_2.11</artifactId>
<version>${scalactic.version}</version>
<scope>test</scope>
</dependency>
<!-- http://www.scalatest.org/ -->
<dependency>
<groupId>org.scalatest</groupId>
<artifactId>scalatest_2.11</artifactId>
<version>${scalactic.version}</version>
<scope>test</scope>
</dependency>
Chech that all libraries that you are using are in same Scala version
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.10</artifactId>
<version>${spark.version}</version>
<scope>provided</scope>
</dependency>
To
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>${spark.version}</version>
<scope>provided</scope>
</dependency>
Having as properties
<properties>
<scala.tools.version>2.11.8</scala.tools.version>
<scala.version>2.11.8</scala.version>
<scalactic.version>3.0.0</scalactic.version>
<!-- Library Versions -->
<spark.version>2.0.0</spark.version>
....
</properties>
回答5:
I just encountered the same problem. Turned out that I had downloaded the wrong version of Akka which included scala-library-2.10.x, while my project uses 2.11.6. Grabbing the latest version of Akka, which includes 2.11.5, solved the problem.
So, it seems this is a compatibility issue, so I would check dependencies in the future.
回答6:
Error java.lang.NoSuchMethodError: scala.collection.immutable.$colon$colon.hd$1()Ljava/lang/Object
Reason This error is specifically due to version mismatch between spark and scala. I faced the error while I was using spark 2.2.0 and scala 2.10.6. Then I changed to different scala versions but I got no success.
Resolution This error is resolved only when I changed the scala version to 2.11.6 . This version was a perfect match for spark 2.2.0. May be you can try higher versions of scala for the same issue , but I tried for 2.12.x but didnt work.
Suggestion Request you to set the below versions before doing any coding: spark - 2.2.0 scala - 2.11.6
Also I used the below pom :
<dependencies>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>2.2.0</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming_2.11</artifactId>
<version>2.2.0</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.11</artifactId>
<version>2.2.0</version>
</dependency>
</dependencies>
回答7:
I have the same problem. When you change it to using map function it works! I don't know why but thats how to fix it.
回答8:
I have found that this can be caused by having differing versions of scalatest and scalamock. The Following Maven
<dependency>
<groupId>org.scalatest</groupId>
<artifactId>scalatest_2.11</artifactId><!-- this was previously 2.10 -->
<version>2.2.4</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.scalamock</groupId>
<artifactId>scalamock-scalatest-support_2.11</artifactId>
<version>3.2</version>
<scope>test</scope>
</dependency>
回答9:
I had the same thing when adding json4. i solved it by changing the artifactId from json4s-native_2.12 to - json4s-native_2.11.
I guess this is related to the scala version you are using mine was 2.11 and not 2.12 (you can see yours in the properties xml node in the pom.xml file, mine is : <scala.version>2.11</scala.version>.)
回答10:
I solved this by set my scala sdk version in my project from 2.12 to 2.11.
回答11:
it is version problem, just use scala sdk version to 2.11.
来源：https://stackoverflow.com/questions/26390219/intellij-idea-java-lang-nosuchmethoderror-scala-collection-immutable-coloncol