Problem with typing square brackets

[Kolja Richter]

Hello everyone, 

I am a Newbie, trying to learn how to code with scala. Currently, I using the introductory book "Programming in Scala" by Martin Odersky. 

I have a problem, typing square brackets in the REPL. I use a Thinkpad Laptop with German keyboard layout. Normally, square brackets are produced by typing AltGr+8 and AltGr+9. (AltGr is the Alt key in the right side.) Normally, this works without difficulties, but not in the REPL. 

What happens is this: 
When I press AltGr+8 for the first time, nothing happens. When I press it for the second time, I get the opening square bracket "[". At the beginning, I just thought I had missed a key, but I really have to press 8 twice. 
When I press AltGr+9 nothing happens. I tried, pressing it twice, but it doesn't work. By complete chance I found out, how to produce the closing square bracket "]". I have to press AltGr+8, keep AltGr pressed and then press 9! This reliably produces the closing square bracket "]". 

As you can probably imagine, this is quite annoying. 

It only happens in the REPL, not in other applications, e.g. editors, wordprocessors etc. 

Since Scala relies on the JVM, I believe, that the problem might have something to do with the JVM. Out of interest, I downloaded Clojure, which is also based on the JVM and features an REPL. Et voila, the same problem in Clojure. 

OK, this problem is obviously not about programming. But if any of you has any ideas, what I could do in order to have normal keyboard response in the REPL, I would be glad to hear (read) them. 

Thanks in advance 

Kolja

[Oliver Ruebenacker]

     Hello,

  When you say this does not happen in other applications, did you also check applications running in the same terminal window as the REPL?

     Best, Oliver

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Oliver Ruebenacker

Solutions Architect at Altisource Labs

Be always grateful, but never satisfied.

[Oliver Ruebenacker]

     Hello,

  Actually, which OS and which kind of terminal do you use?

     Best, Oliver

[Simon Schäfer]

This is a known bug: https://issues.scala-lang.org/browse/SI-8759

[Kolja Richter]

Hello, Oliver nice to have some reactions. My machine is a Lenovo Thinkpad Edge E555 running with Windows 7. I use Java 8. The keyboard layout is German. I also have a desktop PC running with Linux Mint, but on this machine everything works just fine.

Hello Simon, thanks for your link, which looks promising.

[Kolja Richter]

I replaced jline-2.12.jar in scala/lib with  jlin-2.11. Now everything  works as it should.

Hope  other people  like me will read this. The bug  is  quite annoying, since square brackets are often needed.

Thanks for your help.

Kolja

[Som Snytt]

Is it safe to say that this is not a problem with the Swiss keyboard?

Or is the dotty repl using jline-2.11?

Since this has come up a few times, it will be interesting to see if a fix is induced upstream. It would probably have to be a contribution.

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[Kolja Richter]

Hello som-snyt,

I wouldn't know whether the same issue arises with a Swiss keyboard layout, since I am located in Germany.

Greetings

Kolja

[Bjorn Regnell]

I have been hit by this bug many times when trying to help people getting started with Scala. This bug gives a bad impression to newcomers as it seems so basic and plausible to be able to type a simple type annotation... I would really like the next Scala release to go back to jline 2.11 and the problem would be solved...
/B

[Grzegorz Kossakowski]

For people following this thread, we are getting closer to fix for this annoying bug:

https://issues.scala-lang.org/browse/SI-8759?focusedCommentId=71632&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-71632

https://github.com/jline/jline2/pull/175

Do not hesitate to express your excitement of Michael's patch on the pull request. Hopefully, in return of a bit of positive vibe we'll get a faster release of Jline.

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Grzegorz Kossakowski

Scalac hacker at Typesafe

twitter: @gkossakowski

github: @gkossakowski