I agree, but it also may be more than a simple project structure and dependency problems
Flink currently has six files that import `scala.reflect.macros.Context`. With 2.11, Scala has deprecated this import in favor of `scala.reflect.macros.blackbox.Context` and `scala.reflect.macros.whitebox.Context`. http://docs.scala-lang.org/overviews/macros/changelog211.html <http://docs.scala-lang.org/overviews/macros/changelog211.html> http://docs.scala-lang.org/overviews/macros/blackbox-whitebox.html <http://docs.scala-lang.org/overviews/macros/blackbox-whitebox.html> I’m still getting my head wrapped around macros in the first place, but I’ve at instrumented a gradle build in my take on the canonical Flink quickstart to illustrate the issue. https://github.com/OCExercise/wordcount-processing/blob/master/build.gradle <https://github.com/OCExercise/wordcount-processing/blob/master/build.gradle> The error resulting from this is long, truncated at the most important part, and doesn’t give any direct hint as to where it might be emerging within the Flink dependencies. https://gist.github.com/revprez/298a0302711908975add <https://gist.github.com/revprez/298a0302711908975add> Prez Cannady p: 617 500 3378 e: revp...@opencorrelate.org <mailto:revp...@opencorrelate.org> GH: https://github.com/opencorrelate <https://github.com/opencorrelate> LI: https://www.linkedin.com/in/revprez <https://www.linkedin.com/in/revprez> > On Jan 18, 2016, at 3:57 AM, Till Rohrmann <trohrm...@apache.org> wrote: > > This might be related to the problem mentioned in > https://issues.apache.org/jira/browse/FLINK-3241 and > http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/flink-1-0-SNAPSHOT-scala-2-11-compilation-error-td4303.html > . > > Cheers, > Till > > On Sun, Jan 17, 2016 at 6:26 PM, Prez Cannady <revp...@correlatesystems.com> > wrote: > >> I concur. Already had "import org.apache.flink.streaming.api.scala._”, >> and just tried adding "import org.apache.flink.api.scala._”. Same issue. >> >> >> >> Prez Cannady >> p: 617 500 3378 >> e: revp...@opencorrelate.org <mailto:revp...@opencorrelate.org> >> GH: https://github.com/opencorrelate <https://github.com/opencorrelate> >> LI: https://www.linkedin.com/in/revprez < >> https://www.linkedin.com/in/revprez> >> >> >> >> >> >> >> >> >> >>> On Jan 17, 2016, at 8:59 AM, Aljoscha Krettek <aljos...@apache.org> >> wrote: >>> >>> Hi, >>> I think it’s more complicated than a missing import statement (the code >> has the correct import statement). I’ll look into it. >>> >>> Cheers, >>> Aljoscha >>>> On 17 Jan 2016, at 13:32, Stephan Ewen <se...@apache.org> wrote: >>>> >>>> Hi! >>>> >>>> I think this no Scala version issue, you probably miss an import >> statement: >>>> >>>> "import org.apache.flink.streaming.api.scala._" or "import >>>> org.apache.flink.api.scala._" >>>> >>>> See also here: >>>> >> http://flink.apache.org/faq.html#in-scala-api-i-get-an-error-about-implicit-values-and-evidence-parameters >>>> >>>> Greetings, >>>> Stephan >>>> >>>> On Sat, Jan 16, 2016 at 9:09 PM, Prez Cannady < >> revp...@opencorrelate.org> >>>> wrote: >>>> >>>>> Attempting to get settled with Flink under Scala 2.11, but running into >>>>> some odd issues with macro expansion in a project that depends on >>>>> flink-scala_2.11 and flink-runtime_211. >>>>> >>>>> I’ve instrumented the SocketStreamWordCount quick start < >>>>> https://github.com/OCExercise/wordcount-processing> to test this >> issue. >>>>> It depends on Flink 1.0-SNAPSHOT, so you can test against a local >> build of >>>>> Flink for 2.11. >>>>> >>>>> Steps taken >>>>> >>>>> Cloned source and checked out release-0.1 >>>>> Ran tools/change-scala-version.sh 2.11 >>>>> Ran mvn clean install -Dscala.version=2.11.4 >> -Dscala.binary.version=2.11 >>>>> -Dakka.version=2.4.1 -DskipTests=true at Flink root; build succeeds >>>>> Ran my spring-booted downstream project’s build and boot run. >>>>> Expected result >>>>> >>>>> Success >>>>> >>>>> Actual result >>>>> >>>>> During compilation, I get the following error: >>>>> >>>>> [ERROR] >>>>> >> /Users/revprez/dev/exercise/systems/jvm/flink/wordcount-processing/src/main/scala/org/opencorrelate/jvm/scala/SocketTextStreamWordCount.scala:73: >>>>> error: could not find implicit value for evidence parameter of type >>>>> org.apache.flink.api.common.typeinfo.TypeInformation[String] >>>>> [ERROR] val counts = text.flatMap { _.toLowerCase.split("\\W+") >>>>> filter { _.nonEmpty } } >>>>> [ERROR] ^ >>>>> [ERROR] >>>>> >> /Users/revprez/dev/exercise/systems/jvm/flink/wordcount-processing/src/main/scala/org/opencorrelate/jvm/scala/WordCount.scala:40: >>>>> error: can't expand macros compiled by previous versions of Scala >>>>> [ERROR] val text = env.fromElements("To be, or not to be,--that is >> the >>>>> question:--", >>>>> >>>>> >>>>> Discussion >>>>> >>>>> I’m not sure how the Maven build actually succeeded, as there doesn’t >> seem >>>>> to be any quasiquotes_2.11 under org.scalamacros < >>>>> http://central.maven.org/maven2/org/scalamacros/> of any version in >> the >>>>> public repos, nor in the four vendor repos configured in flink-parent’s >>>>> pom.xml. Unless I’m missing something, >>>>> >>>>> <dependencies> >>>>> <dependency> >>>>> <groupId>org.scalamacros</groupId> >>>>> >>>>> <artifactId>quasiquotes_${scala.binary.version}</artifactId> >>>>> <version>${scala.macros.version}</version> >>>>> </dependency> >>>>> </dependencies> >>>>> >>>>> >>>>> I recall an earlier discussion about issues with 2.10 stuff polluting >> the >>>>> 2.11 build. Not sure if this is related–I’m able to get through >> everything >>>>> I’ve identified up to this point by simply overriding properties in >>>>> flunk-parent with command line arguments. >>>>> >>>>> Also not sure what next steps to take. Don’t know enough about Scala >>>>> Macros to know if substituting, say, >> org.scalameta:quasiquotes_2.11:0.0.4 >>>>> is a viable option (actually tried it, seems to be more trouble than >> it’s >>>>> worth). >>>>> >>>>> If anyone has any ideas, I’m more than willing to try thing—Flink’s on >> our >>>>> critical path and if we can get it operational under 2.11 then we’er >> golden. >>>>> >>>>> >>>>> >>>>> Prez Cannady >>>>> p: 617 500 3378 >>>>> e: revp...@opencorrelate.org <mailto:revp...@opencorrelate.org> >>>>> GH: https://github.com/opencorrelate <https://github.com/opencorrelate >>> >>>>> LI: https://www.linkedin.com/in/revprez < >>>>> https://www.linkedin.com/in/revprez> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>> >> >>
