Version 2.12 of the Scala programming language.
Version 2.12 of the scala programming language. Notable is that it will require Java 8.
Questions tagged [scala-2.12]
75 questions
20
votes
3 answers
java.lang.NoClassDefFoundError: javax/xml/bind/DatatypeConverter
After installing JDK9, I get this exception when running my Scala projects. Upgrading Scala to 2.12.2 also didn't resolve my problem.
abshar
- 467
- 1
- 4
- 8
14
votes
2 answers
Scala-Cats Validated: value mapN is not a member of ValidatedNel tuple
Scala community.
Currently I'm trying to implement custom model/single parameter validation using cats Validated Monad. But, after removal of Cartesian product since 1.0 I'm unable to use (v1 |@| v2) map (f) and unable to compile my code:
import…
dev
- 145
- 1
- 7
7
votes
2 answers
Scala hex literal for bytes
Hex literal containing A-F digit are converting to int by default. When I am trying to declear an Int with 0x it is creating correctly.
val a: Int = 0x34
val b: Int = 0xFF
But when I am trying to declear a Byte with 0x second line is not…
Nafeez Abrar
- 1,045
- 10
- 27
7
votes
1 answer
Scala Script: Explain this class cast error to ScalaClassLoader on Windows
Consider following scala script:
import scala.reflect.internal.util.ScalaClassLoader
object Test {
def main(args: Array[String]) {
val classloaderForScalaLibrary = classOf[ScalaClassLoader.URLClassLoader].getClassLoader
…
Kshitiz Sharma
- 17,947
- 26
- 98
- 169
7
votes
1 answer
Implicit ExecutionContext priority in Scala 2.12
In Scala 2.12 importing the global execution context and then having another implicit execution context defined in the scope results in an ambiguous implicit, while in 2.11 it works just fine.
import scala.concurrent._
import…
ochrons
- 691
- 5
- 10
7
votes
1 answer
Scala 2.12 uses Java 1.8; what should we do if we are unable to upgrade to Java 1.8?
The release of Scala 2.12 Milestone 1 indicates it requires Java 1.8. What should Scala users who are not able to go to Java 1.8 at this moment plan to do?
Daniel C. Sobral
- 295,120
- 86
- 501
- 681
5
votes
2 answers
Scala incompatible nested types created in implicit class
The code fragment provided is a made-up minimalistic example just to demonstrate the issue, not related to actual business logic types.
In the code below we have a nested Entry type inside Registry type.
class Registry[T](name: String) {
case…
Ivan Klass
- 6,407
- 3
- 30
- 28
5
votes
1 answer
For comprehensions Future and Either
I am struggling in how to compose a sequence of asynchronous processes in a nice monadic way. Each step of the process could fail so it is retrieving a Future[Either[String, T]].
def firstStep(input: Int): Future[Either[String, Long]] = ???
def…
Mikel San Vicente
- 3,831
- 2
- 21
- 39
5
votes
1 answer
Scala get the line and file of a functions invocation at compile-time
What I want to have is a function that is able to print the lines + file from where it was called.
The behavior would be something like this:
log("x") //Called at line 15 of file Blax.scala
Should print
Blax.scala, line 15, message: x
Something…
George
- 3,521
- 4
- 30
- 75
5
votes
3 answers
WS in Play become incredible complex for 2.6.X
For Play 2.3.X the WS module is very easy to be used:
WS.url(s"http://$webEndpoint/hand/$handnumber").get()
For the such simple and strightforward usage.
While in Play 2.6.x according to the link :…
wherby
- 704
- 1
- 5
- 16
5
votes
0 answers
Implicit argument getting SAM'd?
Here's some code that compiles in 2.11, but fails in 2.12:
object Main extends App {
implicit val c: Configured[String] = new Configured[String] { def apply(v: CfgValue): Option[String] = None }
val a = Configured[String]
}
sealed trait…
Reactormonk
- 21,472
- 14
- 74
- 123
5
votes
4 answers
How to add a time based watcher to a Scala Future?
I want to add an after(d: FiniteDuration)(callback: => Unit) util to Scala Futures that would enable me to do this:
val f = Future(someTask)
f.after(30.seconds) {
println("f has not completed in 30 seconds!")
}
f.after(60.seconds) {
println("f…
pathikrit
- 32,469
- 37
- 142
- 221
5
votes
1 answer
Scala parser cuts last bracket
Welcome to Scala 2.12.1 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_121).
Type in expressions for evaluation. Or try :help.
scala> :paste
// Entering paste mode (ctrl-D to finish)
import scala.reflect.runtime._
import…
Andrzej Jozwik
- 14,331
- 3
- 59
- 68
4
votes
0 answers
Regex named capturing groups throw IllegalStateException in Scala
Edit 1: @GoodDok I can't use val regex = """(\d+) (\S+)""".r("Id", "Name") because regex pattern and matched string are supplied by user. Number of groups and naming is custom every time.
Edit 2: @Wiktor Stribiżew The question is different than…
Krzysztof Piekutowski
- 646
- 2
- 6
- 17
4
votes
1 answer
Scala Future.find
Scala 2.12 has 2 Future.find methods.
@deprecated("use the overloaded version of this method that takes a scala.collection.immutable.Iterable instead", "2.12.0")
def find[T](@deprecatedName('futurestravonce) futures:…
suish
- 3,253
- 1
- 15
- 34