Records are called „methods“ in JShell

Thu Jul 16 10:39:57 UTC 2020

> ...Please, can anybody on the list recommend a thorough
> resource on advanced use of JShell?...

This [1] is very good. Anybody know of any others?

---- 

[1] https://docs.oracle.com/javase/9/jshell/JSHEL.pdf

-------- Original Message --------
Subject: Re: Records are called „methods“ in JShell
From: "Lingo Coder" <plugins at lingocoder.com>
Date: Thu, July 16, 2020 2:47 am
To: "Robert Field" <robert.field at oracle.com>, "Lingo Coder"
<plugins at lingocoder.com>, "kulla-dev at openjdk.java.net"
<kulla-dev at openjdk.java.net>, "jorn.vernee at oracle.com"
<jorn.vernee at oracle.com>

Thank you Robert, Jorn, and Jan,

A couple last things. Please?

1. How is that `mymode` has persisted so long and
 is configured for every one of my JDKs since JDK9?
 Even though they are all in their own folders? 

 I set `mymode` way back in 2017 in a JDK 9 install; 
 that was so long ago that I'd forgotten it. Since
 then, I've used JDKs 10-15. They're all in their
 own folders. 

2. Please, can anybody on the list recommend a thorough
 resource on advanced use of JShell? I've learned
 a lot about JShell from Java 9 Revealed — For Early
 Adoption and Migration by Kishor Sharan

By „advanced“ I mean things like: How to configure the
built-in default snippet editor on Windows, to open
centered in the screen; instead of opening at an X * Y
position that has most of the editor off screen at the
bottom-right of the window.

TIA.

-------- Original Message --------
Subject: Re:_Records_are_called_„methods“_in_JSh ell
From: Robert Field <robert.field at oracle.com>
Date: Wed, July 15, 2020 9:04 pm
To: Lingo Coder <plugins at lingocoder.com>, 
"kulla-dev at openjdk.java.net" <kulla-dev at openjdk.java.net>, 
"jorn.vernee at oracle.com" <jorn.vernee at oracle.com>

 Thanks for persisting with this!
 I have filed a bug:
 https://bugs.openjdk.java.net/browse/JDK-8249566
 I am able to reproduce it (see bug).
 You should be able to see it working correctly by doing:
 jshell> /set feedback normal

 jshell> public record ConstExpr(Expr e) implements Expr{}
 See work-around suggestions in bug.
 I will be looking into fixes.
 Thanks,
 Robert

 On 2020-07-15 13:47, Lingo Coder wrote:

 Thank you so much, Robert! Hopefully,/set format mymode typeKind
"record" recordWill fix your issue. I had high hopes for that [1]
but...jshell> /set format mymode typeKind| /set format mymode typeKind
"class" class| /set format mymode typeKind "interface" interface| /set
format mymode typeKind "enum" enum| /set format mymode typeKind
"annotation interface" annotationjshell> public record ConstExpr(Expr e)
implements Expr{}| created method ConstExpr(), however, it cannot be
referenced untilclass Expr is declaredjshell> /set format mymode
typeKind "record" recordjshell> /set format mymode typeKind| /set format
mymode typeKind "class" class| /set format mymode typeKind "interface"
interface| /set format mymode typeKind "enum" enum| /set format mymode
typeKind "annotation interface" annotation| /set format mymode typeKind
"record" recordjshell> public record ConstExpr(Expr e) implements
Expr{}| modified method ConstExpr(), however, it cannot be referenced
untilclass Expr is declared----[1] https://imgur.com/GaIgkOb--------
Original Message --------Subject:
Re:_Records_are_called_„methods“_in_JSh ellFrom: Robert Field
<robert.field at oracle.com>Date: Wed, July 15, 2020 11:09 amTo: Lingo
Coder <plugins at lingocoder.com>, "kulla-dev at openjdk.java.net"
<kulla-dev at openjdk.java.net>, "jorn.vernee at oracle.com"
<jorn.vernee at oracle.com>OK! There is the root of your issue. You have
your own mode, but it probably hasn't been updated for records. You
aren't using normal mode so, instead, show the output of: /set format
mymode typeKindHopefully,/set format mymode typeKind "record" recordWill
fix your issue.-RobertOn 7/15/20 7:33 AM, Lingo Coder wrote: Thank you
Robert, „...And send us what it prints...“ You'll see below that
right after I did `/set format normal typeKind`it still said, „created
*method*...“. I also recorded it. [1]But then right after `/set
feedback verbose`, it said „created*record*“.However, after an
`/exit` and a relaunch of `jshell --enable-preview`,itreverted back to
„created *method*...“/„dropped *method*... “.I _vaguely_ recall
creating `mymode` and doing `/set feedback -retainmymode`way back in
2017 when JShell first came out. I think. I'm not 100% suretho.So I'm
guessing I need to do `/set feedback -retain verbose` topermanentlyget
„created *record*...“ Correct?TIA.----...jshell> /set feedback| /set
feedback -retain mymode|| Retained feedback modes:| mymode| Available
feedback modes:| concise| mymode| normal| silent| verbosejshell> /set
format normal typeKind| /set format normal typeKind "class" class| /set
format normal typeKind "interface" interface| /set format normal
typeKind "enum" enum| /set format normal typeKind "annotation interface"
annotation| /set format normal typeKind "record" recordjshell> public
record ConstExpr(Expr e) implements Expr{}| created method ConstExpr(),
however, it cannot be referenced untilclass Expr is declaredjshell>
/type| record ConstExpr| which cannot be referenced until class Expr is
declaredjshell> /types| record ConstExpr| which cannot be referenced
until class Expr is declaredjshell> /method| void print(boolean)| void
print(char)| void print(int)| void print(long)| void print(float)| void
print(double)| void print(char s[])| void print(String)| void
print(Object)| void println()| void println(boolean)| void
println(char)| void println(int)| void println(long)| void
println(float)| void println(double)| void println(char s[])| void
println(String)| void println(Object)| void
printf(java.util.Locale,String,Object...)| void
printf(String,Object...)jshell> /drop ConstExpr| dropped method
ConstExpr()jshell> /set feedback verbose| Feedback mode: verbosejshell>
public record ConstExpr(Expr e) implements Expr{}| created record
ConstExpr, however, it cannot be referenced untilclass Expr is
declaredjshell> /type| record ConstExpr| which cannot be referenced
until class Expr is declaredjshell> class Expr{}| created class
Exprjshell> /types| record ConstExpr| which cannot be referenced until
this error is corrected:| interface expected here| public record
ConstExpr(Expr e) implements Expr{}| ^--^| class Exprjshell> /drop Expr|
dropped class Exprjshell> interface Expr{}| created interface Expr|
update replaced record ConstExprjshell> /types| record ConstExpr|
interface Exprjshell> /drop ConstExpr| dropped record
ConstExpr...----[1] https://imgur.com/ePyilYo-------- Original Message
--------Subject: Re:_Records_are_called_„methods“_in_JSh ellFrom:
Robert Field <robert.field at oracle.com>Date: Tue, July 14, 2020 8:07
pmTo: Lingo Coder <plugins at lingocoder.com>,"kulla-dev at openjdk.java.net"
<kulla-dev at openjdk.java.net>,"jorn.vernee at oracle.com"
<jorn.vernee at oracle.com>I have a theory, maybe the following can
illuminate...Couple more things to try:/set feedback/set format normal
typeKindAnd send us what it prints.Also, after you have entered:public
record ConstExpr(Expr e) implements
Expr{}Type:/typeand/methodSeparately, what do they print?Oh, and if you
want to try one more thing:/set feedback verbosepublic record
ConstExpr(Expr e) implements Expr{}Sorry, I don't have Windows, but I
believe Jan has access.-RobertOn 2020-07-14 18:35, Lingo Coder wrote: 
Thanks Robert, „...Can you do:jshell --full-version...“ I did
that. It says jshell 15-ea+31-1502 [1]What version of Windows are you
other guys trying this in? I'm onWindows 7. „...I'm guessing you may
be using an older JDK...“ As I show in [1] and in earlier screen
recordings, I completelyclear my $PATH to confirm that there is no other
jshell.exe onthe $PATH.I have not installed any JDKs with an installer
or anythinglike that. For that reason, I rule out anything
registry-related.I do have an early access release of 14-Valhallabuild
14-valhalla+4-55 on my workstation. But, that wasinstalled by simply
unzipping the archive into ajdk-14.L.world.Build.14-valhalla+4-55
folder. More importantly,that build doesn't even have the records nor
the sealed typesfeatures.I also have GA releases of OpenJDK 12 & 13 in
their own folders.But again, not only are they isolated well out of the
way ofthe $PATH I run jshell 15 in, they don't even have records
andsealed types functionality.If _any_ other JDK were somehow in the
$PATH, it would besurprising if records and sealed types even worked _at
all_;let alone the misnaming as „methods“ issue Right? Pleasecorrect
me if I'm wrong?[1] https://imgur.com/cMsAl5f-------- Original Message
--------Subject: Re:_Records_are_called_„methods“_in_JSh ellFrom:
Robert Field <robert.field at oracle.com>Date: Tue, July 14, 2020 3:57
pmTo: kulla-dev at openjdk.java.net,
jorn.vernee at oracle.com,plugins at lingocoder.comI'm guessing you may be
using an older JDK. I get:jshell> public record ConstExpr(Expr e)
implements Expr{}| created record ConstExprjshell> /drop ConstExpr|
dropped record ConstExprCan you do:jshell --full-versionThanks,Robert