If you want to run on JDK 11 you will need to make sure you have a
reasonably recent scala version installed. These work: 2.11.12, 2.12.11
and of course 2.13.2. It wouldn't hurt to use a recent sbt version as well.
Kind regards,
Erik.
--
Erik van Oosten
https://day-to-day-stuff.blogspot.com/
Op 02-06-20 om 23:39 schreef Jeremiah Malina:
I experienced this as well on Xubuntu 20.04 where I had JDK 11
installed. I found this and was able to install JDK 8 and switch to
it:
https://linuxconfig.org/how-to-install-java-on-ubuntu-20-04-lts-focal-fossa-linux
sbt runs and code compiles now
On Monday, November 4, 2019 at 3:03:49 PM UTC-5, Gabe Lafontant wrote:
I think I _know_ what the source of my issue is but want to ask if
anyone else has seen this problem. Prior to purchasing the book, I
had installed scala on my local machine. My JDK version is 11 and
the scala version I have installed is 2.12.7. I followed the steps
in the wiki:
```
$ chmod a+x ./sbt
$ ./sbt
```
When I execute the last command I receive the
NullPointerException. I think this is due to my machine have JDK
11 installed and I should uninstall it and revert to JDK 8. I
think the version of Scala in the book is not supported by the JDK
version I have. My analysis is based on these findings:
https://docs.scala-lang.org/overviews/jdk-compatibility/overview.html
<https://docs.scala-lang.org/overviews/jdk-compatibility/overview.html>
https://github.com/ProjectSidewalk/SidewalkWebpage/issues/1346
<https://github.com/ProjectSidewalk/SidewalkWebpage/issues/1346>
https://stackoverflow.com/questions/32152431/sbt-gives-java-lang-nullpointerexception-when-trying-to-run-simple-hello-exam
<https://stackoverflow.com/questions/32152431/sbt-gives-java-lang-nullpointerexception-when-trying-to-run-simple-hello-exam>
Once I got back to an older version of the JDK I think I should be
fine. Does that make sense?
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