From kan.izh at gmail.com  Wed Aug  2 23:30:22 2023
From: kan.izh at gmail.com (Anatoly Kupriyanov)
Date: Thu, 3 Aug 2023 00:30:22 +0100
Subject: [JEP 430] StringTemplate should be generic?
Message-ID: <CAGwStpC1BXpRhOHeesC4Wtu5=21xtDnqODOh12DLBSMTa3c4yw@mail.gmail.com>

As I see values are always Object. However, for type-safety it would be
good to have bounded types:

public interface StringTemplate<V> {
    List<V> values();
 ...
}


E.g. a Json template should require values to be JSONObject. In this case
it would be possible to compose fragments with type-safety like this:

String name = "Joan Smith";
String phone = null;
boolean residential = true;

JSONObject address = JSON."""
    {
        "residential": \{JSON.primitive(residential)},
        "postcode":    \{JSON.primitive(postcode)}
    }    """;

JSONObject doc = JSON."""
    {
        "name":    \{JSON.primitive(name)},
        "phone":   \{JSON.primitive(phone)},
        "address": \{address}
    }
    """;


There are some good ideas implemented in C# for type-safety, e.g. it allows
to have different overloads for different types for avoiding run-time type
matching. See AppendFormatted here
https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-10.0/improved-interpolated-strings

-- 
WBR, Anatoly.
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From duke at openjdk.org  Thu Aug  3 13:49:56 2023
From: duke at openjdk.org (duke)
Date: Thu, 3 Aug 2023 13:49:56 GMT
Subject: [patterns-instanceof-primitive] Withdrawn: 8303374: Compiler
 Implementation for Primitive types in patterns, instanceof, and switch
In-Reply-To: <dLFJCFUP1E_iAMc0RFMnY5VprCBzjZ3CKCjwztcpLHE=.7f243053-71ff-4d69-85b2-76c839ca000d@github.com>
References: <dLFJCFUP1E_iAMc0RFMnY5VprCBzjZ3CKCjwztcpLHE=.7f243053-71ff-4d69-85b2-76c839ca000d@github.com>
Message-ID: <5HQL42CtqO9cylAYBBusEGldej2jB1CuhT4TQlS8KLk=.d9d7f25a-1bee-46a6-aa52-392c5d4bfa59@github.com>

On Tue, 7 Mar 2023 13:23:29 GMT, Aggelos Biboudis <abimpoudis at openjdk.org> wrote:

> Prototype implementation for primitive types in patterns, instanceof, and switch.
> 
> draft JEP: https://openjdk.org/jeps/8288476
> 
> draft spec: https://cr.openjdk.org/~abimpoudis/instanceof/latest/

This pull request has been closed without being integrated.

-------------

PR: https://git.openjdk.org/amber/pull/91

From ice1000kotlin at foxmail.com  Sat Aug  5 04:45:44 2023
From: ice1000kotlin at foxmail.com (=?ISO-8859-1?B?VGVzbGEgWmhhbmc=?=)
Date: Sat, 5 Aug 2023 00:45:44 -0400
Subject: A potential JDK 20 bug
Message-ID: <tencent_45A3B479B3FB57DE53B495C48FE7FAB20508@qq.com>

Trying to run the following code with jdk 20 leads to java.lang.VerifyError:

public class Java20 {
  sealed interface AST {}
  record Lam(String name, AST ast) implements AST {}
  record Var(String name) implements AST {}
  record Pair(AST a, AST b) {}

  static void test(AST x, AST y) {
    System.out.println(switch (new Pair(x, y)) {
      case Pair(Lam(var a, var b), var c) -&gt; a + b + c;
      case Pair(var a, Lam b) -&gt; b.toString();
      default -&gt; "1919";
    });
  }

  public static void main(String[] args) {
    test(new Var("a"), new Var("b"));
  }
}


The exception is:


Error: Unable to initialize main class com.intellij.bug.Java20 in module intellij.bug.reports
Caused by: java.lang.VerifyError: Bad local variable type
Exception Details:
&nbsp; Location:
&nbsp; &nbsp; com/intellij/bug/Java20.test(Lcom/intellij/bug/Java20$AST;Lcom/intellij/bug/Java20$AST;)V @192: aload
&nbsp; Reason:
&nbsp; &nbsp; Type top (current frame, locals[10]) is not assignable to reference type
&nbsp; Current Frame:
&nbsp; &nbsp; bci: @192
&nbsp; &nbsp; flags: { }
&nbsp; &nbsp; locals: { 'com/intellij/bug/Java20$AST', 'com/intellij/bug/Java20$AST', 'com/intellij/bug/Java20$Pair', integer, 'com/intellij/bug/Java20$Pair', top, top, top, top, 'com/intellij/bug/Java20$AST', top, 'com/intellij/bug/Java20$AST', integer }
&nbsp; &nbsp; stack: { 'java/io/PrintStream' }
&nbsp; Bytecode:
&nbsp; &nbsp; 0000000: b200 07bb 000d 592a 2bb7 000f 59b8 0012
&nbsp; &nbsp; 0000010: 574d 033e 2c1d ba00 1800 00ab 0000 00b2
&nbsp; &nbsp; 0000020: 0000 0001 0000 0000 0000 0011 2c3a 0419
&nbsp; &nbsp; 0000030: 04b6 001c 3a0b 0336 0c19 0b15 0cba 0020
&nbsp; &nbsp; 0000040: 0000 aa00 0000 0086 ffff ffff 0000 0001
&nbsp; &nbsp; 0000050: 0000 0056 0000 001a 0000 0056 190b c000
&nbsp; &nbsp; 0000060: 213a 0519 04b6 0023 3a0d 190d 3a06 1905
&nbsp; &nbsp; 0000070: b600 263a 0d19 0d3a 0719 05b6 002a 3a0d
&nbsp; &nbsp; 0000080: 190d 3a08 1907 1908 b800 2d19 06b8 002d
&nbsp; &nbsp; 0000090: ba00 3300 00a7 003d 190b 3a09 1909 c600
&nbsp; &nbsp; 00000a0: 2219 04b6 0023 3a0d 190d c100 2199 000d
&nbsp; &nbsp; 00000b0: 190d c000 213a 0aa7 0009 0536 0ca7 ff7c
&nbsp; &nbsp; 00000c0: 190a b600 37a7 000d 043e a7ff 4a12 3aa7
&nbsp; &nbsp; 00000d0: 0003 b600 3ca7 0011 4dbb 0044 592c b600
&nbsp; &nbsp; 00000e0: 462c b700 47bf b1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;
&nbsp; Exception Handler Table:
&nbsp; &nbsp; bci [49, 52] =&gt; handler: 216
&nbsp; &nbsp; bci [101, 104] =&gt; handler: 216
&nbsp; &nbsp; bci [112, 115] =&gt; handler: 216
&nbsp; &nbsp; bci [123, 126] =&gt; handler: 216
&nbsp; &nbsp; bci [163, 166] =&gt; handler: 216
&nbsp; Stackmap Table:
&nbsp; &nbsp; full_frame(@20,{Object[#97],Object[#97],Object[#13],Integer},{Object[#61]})
&nbsp; &nbsp; same_locals_1_stack_item_frame(@44,Object[#61])
&nbsp; &nbsp; full_frame(@57,{Object[#97],Object[#97],Object[#13],Integer,Object[#13],Top,Top,Top,Top,Top,Top,Object[#97],Integer},{Object[#61]})
&nbsp; &nbsp; same_locals_1_stack_item_frame(@92,Object[#61])
&nbsp; &nbsp; same_locals_1_stack_item_frame(@152,Object[#61])
&nbsp; &nbsp; full_frame(@186,{Object[#97],Object[#97],Object[#13],Integer,Object[#13],Top,Top,Top,Top,Object[#97],Top,Object[#97],Integer},{Object[#61]})
&nbsp; &nbsp; same_locals_1_stack_item_frame(@192,Object[#61])
&nbsp; &nbsp; full_frame(@200,{Object[#97],Object[#97],Object[#13],Integer,Object[#13],Top,Top,Top,Top,Top,Top,Object[#97],Integer},{Object[#61]})
&nbsp; &nbsp; full_frame(@205,{Object[#97],Object[#97],Object[#13],Integer},{Object[#61]})
&nbsp; &nbsp; full_frame(@210,{Object[#97],Object[#97]},{Object[#61],Object[#46]})
&nbsp; &nbsp; same_locals_1_stack_item_frame(@216,Object[#66])
&nbsp; &nbsp; same_frame(@230)



Env:
openjdk version "20.0.2" 2023-07-18
OpenJDK Runtime Environment (build 20.0.2+10)
OpenJDK 64-Bit Server VM (build 20.0.2+10, mixed mode, sharing)



Best regards,
Tesla Zhang
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From davidalayachew at gmail.com  Sun Aug  6 23:31:14 2023
From: davidalayachew at gmail.com (David Alayachew)
Date: Sun, 6 Aug 2023 19:31:14 -0400
Subject: Illegal field name when trying to compile with a
 javax.swing.Action
In-Reply-To: <CAA9v-_MBDgM+Ns6iOORwF1y7Z_u4-769Psto8FZc-iY=-dJraw@mail.gmail.com>
References: <CAA9v-_Oo39GDpyXTDFrmbEGDBEWgTbD4WALFgOO2YweRJ1Nv_g@mail.gmail.com>
 <CAA9v-_OiVNJFNMUSj191YjEB5-Qn79wRkSZTTD6fF5WEszq=tw@mail.gmail.com>
 <CAA9v-_NNkg=+odbd7G6bOyy20H5rOkSBuRoa1SGSLSELEqnpRg@mail.gmail.com>
 <CABe8uE0Ncw9UkqcM4QPs4kyEAG+G+6divKwGPHgWtSJYiH+YKA@mail.gmail.com>
 <CAA9v-_MBDgM+Ns6iOORwF1y7Z_u4-769Psto8FZc-iY=-dJraw@mail.gmail.com>
Message-ID: <CAA9v-_NEz6P=y9Aq28DRFJZWE6EB6o7GBEetqSBLbSJhsz+N3g@mail.gmail.com>

Hello Amber Dev Team,

I ran into a problem that I am not sure what the cause is. It only seems to
occur when I am using unnamed variables.


Here are the commands that I am using, as well as their outputs.


$ javac -g -Xlint:all,-preview,-serial -Xdiags:verbose --enable-preview
--source 21 GUI.java
Note: GUI.java uses preview features of Java SE 21.
Note: Recompile with -Xlint:preview for details.


$ java --enable-preview GUI
Error: LinkageError occurred while loading main class GUI
        java.lang.ClassFormatError: Illegal field name "" in class GUI

And here is the file that I am using.


import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JButton;
import java.util.function.BiFunction;

public class GUI
{

   public static void main(String[] args)
   {

      new GUI(null, null);

   }

   public GUI(final Object characterType, final Object icon)
   {

   }

   private Object createConstraintPanel()
   {

      final JPanel constraintPanel = new JPanel();
      final JButton              button = new JButton();

      CREATE_INPUT_SANITIZATION:
      {

         BUTTON_ACTION_LISTENER:
         {

            button
               .addActionListener
               (
                  _ ->
                  {

                     final BiFunction<String, Integer, JLabel> createLabel =
                        (text, width) ->
                        {

                           return null;

                        }
                        ;

                     final JButton remove = new JButton();
                     remove
                        .addActionListener
                        (
                           _ ->
                           {


                           }
                        );

                  }
               )
               ;

         }

      }

      return constraintPanel;

   }

}

Technically, this issue also occurs if even 1 of the 2 unnamed variables is
turned into a real variable. But regardless, the point is, this fails at
run time.

Please let me know if there is anything I am missing.

Thank you for your time and help!
David Alayachew


On Tue, Jul 18, 2023 at 1:54?AM David Alayachew <davidalayachew at gmail.com>
wrote:

> Ok, ty for the heads up.
>
> On Tue, Jul 18, 2023 at 1:18?AM - <liangchenblue at gmail.com> wrote:
>
>> Hi David,
>> Please do not ask for technical support in the development mailing list.
>> There's no proof that this issue is with the core libraries instead of the
>> Java compiler or another component.
>> I have already downloaded your zip, compiled the 4 files with JDK 22 (my
>> local dev build for another unrelated patch) javac --enable-preview
>> -release 22 *.java and java --enable-preview ToDoList, which just shows up
>> a UI without any crash. Without enable-preview, yoru code does not compile
>> at all for the usage of _ as an identifier.
>>
>> This is most likely a problem with the compiler you are using; you have a
>> gpj file, which probably means you are using jGrasp. Please report this
>> issue to the relevant parties (i.e. the 3rd-party IDE or whatever supports
>> using _ as identifer without --enable-preview) instead.
>>
>> Chen Liang
>>
>> On Tue, Jul 18, 2023 at 11:43?AM David Alayachew <
>> davidalayachew at gmail.com> wrote:
>>
>>> Wait, nevermind. Don't ignore. I was able to recreate this issue on the
>>> command line using the abovementioned JDK. Could someone come back and take
>>> a look at this please?
>>>
>>> Sorry for jerking everyone around here. I have multiple JDK's and got
>>> mixed up on which one I was using.
>>>
>>> On Sun, Jul 16, 2023 at 2:26?AM David Alayachew <
>>> davidalayachew at gmail.com> wrote:
>>>
>>>> Hmmmm, this one might actually be IDE specific. Please ignore.
>>>>
>>>
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From davidalayachew at gmail.com  Sun Aug  6 23:31:54 2023
From: davidalayachew at gmail.com (David Alayachew)
Date: Sun, 6 Aug 2023 19:31:54 -0400
Subject: Illegal field name when trying to compile with a
 javax.swing.Action
In-Reply-To: <CAA9v-_NEz6P=y9Aq28DRFJZWE6EB6o7GBEetqSBLbSJhsz+N3g@mail.gmail.com>
References: <CAA9v-_Oo39GDpyXTDFrmbEGDBEWgTbD4WALFgOO2YweRJ1Nv_g@mail.gmail.com>
 <CAA9v-_OiVNJFNMUSj191YjEB5-Qn79wRkSZTTD6fF5WEszq=tw@mail.gmail.com>
 <CAA9v-_NNkg=+odbd7G6bOyy20H5rOkSBuRoa1SGSLSELEqnpRg@mail.gmail.com>
 <CABe8uE0Ncw9UkqcM4QPs4kyEAG+G+6divKwGPHgWtSJYiH+YKA@mail.gmail.com>
 <CAA9v-_MBDgM+Ns6iOORwF1y7Z_u4-769Psto8FZc-iY=-dJraw@mail.gmail.com>
 <CAA9v-_NEz6P=y9Aq28DRFJZWE6EB6o7GBEetqSBLbSJhsz+N3g@mail.gmail.com>
Message-ID: <CAA9v-_NaM03g5oDhTsJ-93Ce8Z5jTTPCVq7uzJitTZboORVezg@mail.gmail.com>

Also, here is my version info.


$ java --version
openjdk 21-ea 2023-09-19
OpenJDK Runtime Environment (build 21-ea+31-2444)
OpenJDK 64-Bit Server VM (build 21-ea+31-2444, mixed mode, sharing)


$ javac --version
javac 21-ea



On Sun, Aug 6, 2023 at 7:31?PM David Alayachew <davidalayachew at gmail.com>
wrote:

> Hello Amber Dev Team,
>
> I ran into a problem that I am not sure what the cause is. It only seems
> to occur when I am using unnamed variables.
>
>
> Here are the commands that I am using, as well as their outputs.
>
>
> $ javac -g -Xlint:all,-preview,-serial -Xdiags:verbose --enable-preview
> --source 21 GUI.java
> Note: GUI.java uses preview features of Java SE 21.
> Note: Recompile with -Xlint:preview for details.
>
>
> $ java --enable-preview GUI
> Error: LinkageError occurred while loading main class GUI
>         java.lang.ClassFormatError: Illegal field name "" in class GUI
>
> And here is the file that I am using.
>
>
> import javax.swing.JPanel;
> import javax.swing.JLabel;
> import javax.swing.JButton;
> import java.util.function.BiFunction;
>
> public class GUI
> {
>
>    public static void main(String[] args)
>    {
>
>       new GUI(null, null);
>
>    }
>
>    public GUI(final Object characterType, final Object icon)
>    {
>
>    }
>
>    private Object createConstraintPanel()
>    {
>
>       final JPanel constraintPanel = new JPanel();
>       final JButton              button = new JButton();
>
>       CREATE_INPUT_SANITIZATION:
>       {
>
>          BUTTON_ACTION_LISTENER:
>          {
>
>             button
>                .addActionListener
>                (
>                   _ ->
>                   {
>
>                      final BiFunction<String, Integer, JLabel> createLabel
> =
>                         (text, width) ->
>                         {
>
>                            return null;
>
>                         }
>                         ;
>
>                      final JButton remove = new JButton();
>                      remove
>                         .addActionListener
>                         (
>                            _ ->
>                            {
>
>
>                            }
>                         );
>
>                   }
>                )
>                ;
>
>          }
>
>       }
>
>       return constraintPanel;
>
>    }
>
> }
>
> Technically, this issue also occurs if even 1 of the 2 unnamed variables
> is turned into a real variable. But regardless, the point is, this fails at
> run time.
>
> Please let me know if there is anything I am missing.
>
> Thank you for your time and help!
> David Alayachew
>
>
> On Tue, Jul 18, 2023 at 1:54?AM David Alayachew <davidalayachew at gmail.com>
> wrote:
>
>> Ok, ty for the heads up.
>>
>> On Tue, Jul 18, 2023 at 1:18?AM - <liangchenblue at gmail.com> wrote:
>>
>>> Hi David,
>>> Please do not ask for technical support in the development mailing list.
>>> There's no proof that this issue is with the core libraries instead of the
>>> Java compiler or another component.
>>> I have already downloaded your zip, compiled the 4 files with JDK 22 (my
>>> local dev build for another unrelated patch) javac --enable-preview
>>> -release 22 *.java and java --enable-preview ToDoList, which just shows up
>>> a UI without any crash. Without enable-preview, yoru code does not compile
>>> at all for the usage of _ as an identifier.
>>>
>>> This is most likely a problem with the compiler you are using; you have
>>> a gpj file, which probably means you are using jGrasp. Please report this
>>> issue to the relevant parties (i.e. the 3rd-party IDE or whatever supports
>>> using _ as identifer without --enable-preview) instead.
>>>
>>> Chen Liang
>>>
>>> On Tue, Jul 18, 2023 at 11:43?AM David Alayachew <
>>> davidalayachew at gmail.com> wrote:
>>>
>>>> Wait, nevermind. Don't ignore. I was able to recreate this issue on the
>>>> command line using the abovementioned JDK. Could someone come back and take
>>>> a look at this please?
>>>>
>>>> Sorry for jerking everyone around here. I have multiple JDK's and got
>>>> mixed up on which one I was using.
>>>>
>>>> On Sun, Jul 16, 2023 at 2:26?AM David Alayachew <
>>>> davidalayachew at gmail.com> wrote:
>>>>
>>>>> Hmmmm, this one might actually be IDE specific. Please ignore.
>>>>>
>>>>
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From forax at univ-mlv.fr  Mon Aug  7 19:10:49 2023
From: forax at univ-mlv.fr (Remi Forax)
Date: Mon, 7 Aug 2023 21:10:49 +0200 (CEST)
Subject: Illegal field name when trying to compile with a
 javax.swing.Action
In-Reply-To: <CAA9v-_NaM03g5oDhTsJ-93Ce8Z5jTTPCVq7uzJitTZboORVezg@mail.gmail.com>
References: <CAA9v-_Oo39GDpyXTDFrmbEGDBEWgTbD4WALFgOO2YweRJ1Nv_g@mail.gmail.com>
 <CAA9v-_OiVNJFNMUSj191YjEB5-Qn79wRkSZTTD6fF5WEszq=tw@mail.gmail.com>
 <CAA9v-_NNkg=+odbd7G6bOyy20H5rOkSBuRoa1SGSLSELEqnpRg@mail.gmail.com>
 <CABe8uE0Ncw9UkqcM4QPs4kyEAG+G+6divKwGPHgWtSJYiH+YKA@mail.gmail.com>
 <CAA9v-_MBDgM+Ns6iOORwF1y7Z_u4-769Psto8FZc-iY=-dJraw@mail.gmail.com>
 <CAA9v-_NEz6P=y9Aq28DRFJZWE6EB6o7GBEetqSBLbSJhsz+N3g@mail.gmail.com>
 <CAA9v-_NaM03g5oDhTsJ-93Ce8Z5jTTPCVq7uzJitTZboORVezg@mail.gmail.com>
Message-ID: <1734640837.9801388.1691435449049.JavaMail.zimbra@univ-eiffel.fr>

Hi David, 
thanks for the bug report. 

I was able to reproduce the issue with the latest early acces of 22, 
There is no issue if "-g" is not specified, so the bug seems to be in the debug information that are added to the classfile. 

javac -g --enable-preview --source 22 GUI.java 

Here is a simpler reproducer 
import java.util.function.Consumer ; 

public class GUI { 
public static void main ( String [] args) { 
Consumer < String > op = _ -> {}; 
} 
} 

javap shows the issue, the LocalVariableTable is generated with the name "" 

private static void lambda$main$0(java.lang.String); 
descriptor: (Ljava/lang/String;)V 
flags: (0x100a) ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC 
Code: 
stack=0, locals=1, args_size=1 
0: return 
LineNumberTable: 
line 5: 0 
LocalVariableTable: 
Start Length Slot Name Signature 
0 1 0 Ljava/lang/String; 

The JVM spec 4.7.13 said 
" 
name_index 

The value of the name_index item must be a valid index into the constant_pool table. The constant_pool entry at that index must contain a CONSTANT_Utf8_info structure representing a valid unqualified name denoting a local variable ( [ https://docs.oracle.com/javase/specs/jvms/se20/html/jvms-4.html#jvms-4.2.2 | ?4.2.2 ] ). 

" 

And 4.2.2 said that the string must have at least one code point, so "" is an invalid name, rightly rejected by the VM (the error message is just not great, it's not about a field but a local variable name, here a parameter inside the LocalVariableTable). 

So it's a bug in the compiler, I see two ways to fix it, either do not generate a line in the LocalVariableTable if the parameter is unamed or use "_" instead. 

regards, 
R?mi 

> From: "David Alayachew" <davidalayachew at gmail.com>
> To: "amber-dev" <amber-dev at openjdk.org>
> Sent: Sunday, August 6, 2023 4:31:54 PM
> Subject: Re: Illegal field name when trying to compile with a javax.swing.Action

> Also, here is my version info.

> $ java --version
> openjdk 21-ea 2023-09-19
> OpenJDK Runtime Environment (build 21-ea+31-2444)
> OpenJDK 64-Bit Server VM (build 21-ea+31-2444, mixed mode, sharing)

> $ javac --version
> javac 21-ea

> On Sun, Aug 6, 2023 at 7:31 PM David Alayachew < [
> mailto:davidalayachew at gmail.com | davidalayachew at gmail.com ] > wrote:

>> Hello Amber Dev Team,

>> I ran into a problem that I am not sure what the cause is. It only seems to
>> occur when I am using unnamed variables.

>> Here are the commands that I am using, as well as their outputs.

>> $ javac -g -Xlint:all,-preview,-serial -Xdiags:verbose --enable-preview --source
>> 21 GUI.java
>> Note: GUI.java uses preview features of Java SE 21.
>> Note: Recompile with -Xlint:preview for details.

>> $ java --enable-preview GUI
>> Error: LinkageError occurred while loading main class GUI
>> java.lang.ClassFormatError: Illegal field name "" in class GUI

>> And here is the file that I am using.

>> import javax.swing.JPanel;
>> import javax.swing.JLabel;
>> import javax.swing.JButton;
>> import java.util.function.BiFunction;

>> public class GUI
>> {

>> public static void main(String[] args)
>> {

>> new GUI(null, null);

>> }

>> public GUI(final Object characterType, final Object icon)
>> {

>> }

>> private Object createConstraintPanel()
>> {

>> final JPanel constraintPanel = new JPanel();
>> final JButton button = new JButton();

>> CREATE_INPUT_SANITIZATION:
>> {

>> BUTTON_ACTION_LISTENER:
>> {

>> button
>> .addActionListener
>> (
>> _ ->
>> {

>> final BiFunction<String, Integer, JLabel> createLabel =
>> (text, width) ->
>> {

>> return null;

>> }
>> ;

>> final JButton remove = new JButton();
>> remove
>> .addActionListener
>> (
>> _ ->
>> {

>> }
>> );

>> }
>> )
>> ;

>> }

>> }

>> return constraintPanel;

>> }

>> }

>> Technically, this issue also occurs if even 1 of the 2 unnamed variables is
>> turned into a real variable. But regardless, the point is, this fails at run
>> time.

>> Please let me know if there is anything I am missing.

>> Thank you for your time and help!
>> David Alayachew

>> On Tue, Jul 18, 2023 at 1:54 AM David Alayachew < [
>> mailto:davidalayachew at gmail.com | davidalayachew at gmail.com ] > wrote:

>>> Ok, ty for the heads up.

>>> On Tue, Jul 18, 2023 at 1:18 AM - < [ mailto:liangchenblue at gmail.com |
>>> liangchenblue at gmail.com ] > wrote:

>>>> Hi David,
>>>> Please do not ask for technical support in the development mailing list. There's
>>>> no proof that this issue is with the core libraries instead of the Java
>>>> compiler or another component.
>>>> I have already downloaded your zip, compiled the 4 files with JDK 22 (my local
>>>> dev build for another unrelated patch) javac --enable-preview -release 22
>>>> *.java and java --enable-preview ToDoList, which just shows up a UI without any
>>>> crash. Without enable-preview, yoru code does not compile at all for the usage
>>>> of _ as an identifier.

>>>> This is most likely a problem with the compiler you are using; you have a gpj
>>>> file, which probably means you are using jGrasp. Please report this issue to
>>>> the relevant parties (i.e. the 3rd-party IDE or whatever supports using _ as
>>>> identifer without --enable-preview) instead.

>>>> Chen Liang

>>>> On Tue, Jul 18, 2023 at 11:43 AM David Alayachew < [
>>>> mailto:davidalayachew at gmail.com | davidalayachew at gmail.com ] > wrote:

>>>>> Wait, nevermind. Don't ignore. I was able to recreate this issue on the command
>>>>> line using the abovementioned JDK. Could someone come back and take a look at
>>>>> this please?

>>>>> Sorry for jerking everyone around here. I have multiple JDK's and got mixed up
>>>>> on which one I was using.

>>>>> On Sun, Jul 16, 2023 at 2:26 AM David Alayachew < [
>>>>> mailto:davidalayachew at gmail.com | davidalayachew at gmail.com ] > wrote:

>>>>>> Hmmmm, this one might actually be IDE specific. Please ignore.
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From davidalayachew at gmail.com  Mon Aug  7 19:17:07 2023
From: davidalayachew at gmail.com (David Alayachew)
Date: Mon, 7 Aug 2023 15:17:07 -0400
Subject: Illegal field name when trying to compile with a
 javax.swing.Action
In-Reply-To: <1734640837.9801388.1691435449049.JavaMail.zimbra@univ-eiffel.fr>
References: <CAA9v-_Oo39GDpyXTDFrmbEGDBEWgTbD4WALFgOO2YweRJ1Nv_g@mail.gmail.com>
 <CAA9v-_OiVNJFNMUSj191YjEB5-Qn79wRkSZTTD6fF5WEszq=tw@mail.gmail.com>
 <CAA9v-_NNkg=+odbd7G6bOyy20H5rOkSBuRoa1SGSLSELEqnpRg@mail.gmail.com>
 <CABe8uE0Ncw9UkqcM4QPs4kyEAG+G+6divKwGPHgWtSJYiH+YKA@mail.gmail.com>
 <CAA9v-_MBDgM+Ns6iOORwF1y7Z_u4-769Psto8FZc-iY=-dJraw@mail.gmail.com>
 <CAA9v-_NEz6P=y9Aq28DRFJZWE6EB6o7GBEetqSBLbSJhsz+N3g@mail.gmail.com>
 <CAA9v-_NaM03g5oDhTsJ-93Ce8Z5jTTPCVq7uzJitTZboORVezg@mail.gmail.com>
 <1734640837.9801388.1691435449049.JavaMail.zimbra@univ-eiffel.fr>
Message-ID: <CAA9v-_O-igYFFHM6Zqz8Er+7d=o0fNOYo4_L4TRWb0jNj6TRgw@mail.gmail.com>

Hello R?mi,

Thank you for your response!

And thanks for checking. I had tried to debug this issue earlier on, but
couldn't quite pin down the source.

I am completely ignorant about the LocalVariableTable, so I can't respond
to that or the spec stuff.

If there is any info I can provide, please let me know.

Thank you for your time and help!
David Alayachew

On Mon, Aug 7, 2023 at 3:10?PM Remi Forax <forax at univ-mlv.fr> wrote:

> Hi David,
> thanks for the bug report.
>
> I was able to reproduce the issue with the latest early acces of 22,
> There is no issue if  "-g" is not specified, so the bug seems to be in the
> debug information that are added to the classfile.
>
>   javac -g --enable-preview --source 22 GUI.java
>
> Here is a simpler reproducer
>
>
> import java.util.function.Consumer;
>
> public class GUI {
>    public static void main(String[] args) {
>      Consumer<String> op = _ -> {};
>    }
> }
>
>
> javap shows the issue, the LocalVariableTable is generated with the name ""
>
>  private static void lambda$main$0(java.lang.String);
>     descriptor: (Ljava/lang/String;)V
>     flags: (0x100a) ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC
>     Code:
>       stack=0, locals=1, args_size=1
>          0: return
>       LineNumberTable:
>         line 5: 0
>       LocalVariableTable:
>         Start  Length  Slot  Name   Signature
>             0       1     0         Ljava/lang/String;
>
> The JVM spec 4.7.13 said
> "
> name_index
>
> The value of the name_index item must be a valid index into the
> constant_pool table. The constant_pool entry at that index must contain a
> CONSTANT_Utf8_info structure representing a valid unqualified name
> denoting a local variable (?4.2.2
> <https://docs.oracle.com/javase/specs/jvms/se20/html/jvms-4.html#jvms-4.2.2>
> ).
>
> "
>
> And 4.2.2 said that the string must have at least one code point, so "" is
> an invalid name, rightly rejected by the VM (the error message is just not
> great, it's not about a field but a local variable name, here a parameter
> inside the LocalVariableTable).
>
> So it's a bug in the compiler, I see two ways to fix it, either do not
> generate a line in the LocalVariableTable if the parameter is unamed or use
> "_" instead.
>
> regards,
> R?mi
>
> ------------------------------
>
> *From: *"David Alayachew" <davidalayachew at gmail.com>
> *To: *"amber-dev" <amber-dev at openjdk.org>
> *Sent: *Sunday, August 6, 2023 4:31:54 PM
> *Subject: *Re: Illegal field name when trying to compile with a
> javax.swing.Action
>
> Also, here is my version info.
>
>
> $ java --version
> openjdk 21-ea 2023-09-19
> OpenJDK Runtime Environment (build 21-ea+31-2444)
> OpenJDK 64-Bit Server VM (build 21-ea+31-2444, mixed mode, sharing)
>
>
> $ javac --version
> javac 21-ea
>
>
>
> On Sun, Aug 6, 2023 at 7:31?PM David Alayachew <davidalayachew at gmail.com>
> wrote:
>
>> Hello Amber Dev Team,
>>
>> I ran into a problem that I am not sure what the cause is. It only seems
>> to occur when I am using unnamed variables.
>>
>>
>> Here are the commands that I am using, as well as their outputs.
>>
>>
>> $ javac -g -Xlint:all,-preview,-serial -Xdiags:verbose --enable-preview
>> --source 21 GUI.java
>> Note: GUI.java uses preview features of Java SE 21.
>> Note: Recompile with -Xlint:preview for details.
>>
>>
>> $ java --enable-preview GUI
>> Error: LinkageError occurred while loading main class GUI
>>         java.lang.ClassFormatError: Illegal field name "" in class GUI
>>
>> And here is the file that I am using.
>>
>>
>> import javax.swing.JPanel;
>> import javax.swing.JLabel;
>> import javax.swing.JButton;
>> import java.util.function.BiFunction;
>>
>> public class GUI
>> {
>>
>>    public static void main(String[] args)
>>    {
>>
>>       new GUI(null, null);
>>
>>    }
>>
>>    public GUI(final Object characterType, final Object icon)
>>    {
>>
>>    }
>>
>>    private Object createConstraintPanel()
>>    {
>>
>>       final JPanel constraintPanel = new JPanel();
>>       final JButton              button = new JButton();
>>
>>       CREATE_INPUT_SANITIZATION:
>>       {
>>
>>          BUTTON_ACTION_LISTENER:
>>          {
>>
>>             button
>>                .addActionListener
>>                (
>>                   _ ->
>>                   {
>>
>>                      final BiFunction<String, Integer, JLabel>
>> createLabel =
>>                         (text, width) ->
>>                         {
>>
>>                            return null;
>>
>>                         }
>>                         ;
>>
>>                      final JButton remove = new JButton();
>>                      remove
>>                         .addActionListener
>>                         (
>>                            _ ->
>>                            {
>>
>>
>>                            }
>>                         );
>>
>>                   }
>>                )
>>                ;
>>
>>          }
>>
>>       }
>>
>>       return constraintPanel;
>>
>>    }
>>
>> }
>>
>> Technically, this issue also occurs if even 1 of the 2 unnamed variables
>> is turned into a real variable. But regardless, the point is, this fails at
>> run time.
>>
>> Please let me know if there is anything I am missing.
>>
>> Thank you for your time and help!
>> David Alayachew
>>
>>
>> On Tue, Jul 18, 2023 at 1:54?AM David Alayachew <davidalayachew at gmail.com>
>> wrote:
>>
>>> Ok, ty for the heads up.
>>>
>>> On Tue, Jul 18, 2023 at 1:18?AM - <liangchenblue at gmail.com> wrote:
>>>
>>>> Hi David,
>>>> Please do not ask for technical support in the development mailing
>>>> list. There's no proof that this issue is with the core libraries instead
>>>> of the Java compiler or another component.
>>>> I have already downloaded your zip, compiled the 4 files with JDK 22
>>>> (my local dev build for another unrelated patch) javac --enable-preview
>>>> -release 22 *.java and java --enable-preview ToDoList, which just shows up
>>>> a UI without any crash. Without enable-preview, yoru code does not compile
>>>> at all for the usage of _ as an identifier.
>>>>
>>>> This is most likely a problem with the compiler you are using; you have
>>>> a gpj file, which probably means you are using jGrasp. Please report this
>>>> issue to the relevant parties (i.e. the 3rd-party IDE or whatever supports
>>>> using _ as identifer without --enable-preview) instead.
>>>>
>>>> Chen Liang
>>>>
>>>> On Tue, Jul 18, 2023 at 11:43?AM David Alayachew <
>>>> davidalayachew at gmail.com> wrote:
>>>>
>>>>> Wait, nevermind. Don't ignore. I was able to recreate this issue on
>>>>> the command line using the abovementioned JDK. Could someone come back and
>>>>> take a look at this please?
>>>>>
>>>>> Sorry for jerking everyone around here. I have multiple JDK's and got
>>>>> mixed up on which one I was using.
>>>>>
>>>>> On Sun, Jul 16, 2023 at 2:26?AM David Alayachew <
>>>>> davidalayachew at gmail.com> wrote:
>>>>>
>>>>>> Hmmmm, this one might actually be IDE specific. Please ignore.
>>>>>>
>>>>>
>
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From florent.guillaume at gmail.com  Tue Aug  8 17:59:34 2023
From: florent.guillaume at gmail.com (Florent Guillaume)
Date: Tue, 8 Aug 2023 19:59:34 +0200
Subject: Illegal field name when trying to compile with a
 javax.swing.Action
In-Reply-To: <1734640837.9801388.1691435449049.JavaMail.zimbra@univ-eiffel.fr>
References: <CAA9v-_Oo39GDpyXTDFrmbEGDBEWgTbD4WALFgOO2YweRJ1Nv_g@mail.gmail.com>
 <CAA9v-_OiVNJFNMUSj191YjEB5-Qn79wRkSZTTD6fF5WEszq=tw@mail.gmail.com>
 <CAA9v-_NNkg=+odbd7G6bOyy20H5rOkSBuRoa1SGSLSELEqnpRg@mail.gmail.com>
 <CABe8uE0Ncw9UkqcM4QPs4kyEAG+G+6divKwGPHgWtSJYiH+YKA@mail.gmail.com>
 <CAA9v-_MBDgM+Ns6iOORwF1y7Z_u4-769Psto8FZc-iY=-dJraw@mail.gmail.com>
 <CAA9v-_NEz6P=y9Aq28DRFJZWE6EB6o7GBEetqSBLbSJhsz+N3g@mail.gmail.com>
 <CAA9v-_NaM03g5oDhTsJ-93Ce8Z5jTTPCVq7uzJitTZboORVezg@mail.gmail.com>
 <1734640837.9801388.1691435449049.JavaMail.zimbra@univ-eiffel.fr>
Message-ID: <CAGqi2WmFST_nfto+n58YMc7dVmAgxFpYHOz64ARW2_o-pkbEzQ@mail.gmail.com>

Hi,

I believe this is https://github.com/openjdk/jdk/pull/15083

Florent

On Mon, Aug 7, 2023 at 9:12?PM Remi Forax <forax at univ-mlv.fr> wrote:

> Hi David,
> thanks for the bug report.
>
> I was able to reproduce the issue with the latest early acces of 22,
> There is no issue if  "-g" is not specified, so the bug seems to be in the
> debug information that are added to the classfile.
>
>   javac -g --enable-preview --source 22 GUI.java
>
> Here is a simpler reproducer
>
>
> import java.util.function.Consumer;
>
> public class GUI {
>    public static void main(String[] args) {
>      Consumer<String> op = _ -> {};
>    }
> }
>
>
> javap shows the issue, the LocalVariableTable is generated with the name ""
>
>  private static void lambda$main$0(java.lang.String);
>     descriptor: (Ljava/lang/String;)V
>     flags: (0x100a) ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC
>     Code:
>       stack=0, locals=1, args_size=1
>          0: return
>       LineNumberTable:
>         line 5: 0
>       LocalVariableTable:
>         Start  Length  Slot  Name   Signature
>             0       1     0         Ljava/lang/String;
>
> The JVM spec 4.7.13 said
> "
> name_index
>
> The value of the name_index item must be a valid index into the
> constant_pool table. The constant_pool entry at that index must contain a
> CONSTANT_Utf8_info structure representing a valid unqualified name
> denoting a local variable (?4.2.2
> <https://docs.oracle.com/javase/specs/jvms/se20/html/jvms-4.html#jvms-4.2.2>
> ).
>
> "
>
> And 4.2.2 said that the string must have at least one code point, so "" is
> an invalid name, rightly rejected by the VM (the error message is just not
> great, it's not about a field but a local variable name, here a parameter
> inside the LocalVariableTable).
>
> So it's a bug in the compiler, I see two ways to fix it, either do not
> generate a line in the LocalVariableTable if the parameter is unamed or use
> "_" instead.
>
> regards,
> R?mi
>
> ------------------------------
>
> *From: *"David Alayachew" <davidalayachew at gmail.com>
> *To: *"amber-dev" <amber-dev at openjdk.org>
> *Sent: *Sunday, August 6, 2023 4:31:54 PM
> *Subject: *Re: Illegal field name when trying to compile with a
> javax.swing.Action
>
> Also, here is my version info.
>
>
> $ java --version
> openjdk 21-ea 2023-09-19
> OpenJDK Runtime Environment (build 21-ea+31-2444)
> OpenJDK 64-Bit Server VM (build 21-ea+31-2444, mixed mode, sharing)
>
>
> $ javac --version
> javac 21-ea
>
>
>
> On Sun, Aug 6, 2023 at 7:31?PM David Alayachew <davidalayachew at gmail.com>
> wrote:
>
>> Hello Amber Dev Team,
>>
>> I ran into a problem that I am not sure what the cause is. It only seems
>> to occur when I am using unnamed variables.
>>
>>
>> Here are the commands that I am using, as well as their outputs.
>>
>>
>> $ javac -g -Xlint:all,-preview,-serial -Xdiags:verbose --enable-preview
>> --source 21 GUI.java
>> Note: GUI.java uses preview features of Java SE 21.
>> Note: Recompile with -Xlint:preview for details.
>>
>>
>> $ java --enable-preview GUI
>> Error: LinkageError occurred while loading main class GUI
>>         java.lang.ClassFormatError: Illegal field name "" in class GUI
>>
>> And here is the file that I am using.
>>
>>
>> import javax.swing.JPanel;
>> import javax.swing.JLabel;
>> import javax.swing.JButton;
>> import java.util.function.BiFunction;
>>
>> public class GUI
>> {
>>
>>    public static void main(String[] args)
>>    {
>>
>>       new GUI(null, null);
>>
>>    }
>>
>>    public GUI(final Object characterType, final Object icon)
>>    {
>>
>>    }
>>
>>    private Object createConstraintPanel()
>>    {
>>
>>       final JPanel constraintPanel = new JPanel();
>>       final JButton              button = new JButton();
>>
>>       CREATE_INPUT_SANITIZATION:
>>       {
>>
>>          BUTTON_ACTION_LISTENER:
>>          {
>>
>>             button
>>                .addActionListener
>>                (
>>                   _ ->
>>                   {
>>
>>                      final BiFunction<String, Integer, JLabel>
>> createLabel =
>>                         (text, width) ->
>>                         {
>>
>>                            return null;
>>
>>                         }
>>                         ;
>>
>>                      final JButton remove = new JButton();
>>                      remove
>>                         .addActionListener
>>                         (
>>                            _ ->
>>                            {
>>
>>
>>                            }
>>                         );
>>
>>                   }
>>                )
>>                ;
>>
>>          }
>>
>>       }
>>
>>       return constraintPanel;
>>
>>    }
>>
>> }
>>
>> Technically, this issue also occurs if even 1 of the 2 unnamed variables
>> is turned into a real variable. But regardless, the point is, this fails at
>> run time.
>>
>> Please let me know if there is anything I am missing.
>>
>> Thank you for your time and help!
>> David Alayachew
>>
>>
>> On Tue, Jul 18, 2023 at 1:54?AM David Alayachew <davidalayachew at gmail.com>
>> wrote:
>>
>>> Ok, ty for the heads up.
>>>
>>> On Tue, Jul 18, 2023 at 1:18?AM - <liangchenblue at gmail.com> wrote:
>>>
>>>> Hi David,
>>>> Please do not ask for technical support in the development mailing
>>>> list. There's no proof that this issue is with the core libraries instead
>>>> of the Java compiler or another component.
>>>> I have already downloaded your zip, compiled the 4 files with JDK 22
>>>> (my local dev build for another unrelated patch) javac --enable-preview
>>>> -release 22 *.java and java --enable-preview ToDoList, which just shows up
>>>> a UI without any crash. Without enable-preview, yoru code does not compile
>>>> at all for the usage of _ as an identifier.
>>>>
>>>> This is most likely a problem with the compiler you are using; you have
>>>> a gpj file, which probably means you are using jGrasp. Please report this
>>>> issue to the relevant parties (i.e. the 3rd-party IDE or whatever supports
>>>> using _ as identifer without --enable-preview) instead.
>>>>
>>>> Chen Liang
>>>>
>>>> On Tue, Jul 18, 2023 at 11:43?AM David Alayachew <
>>>> davidalayachew at gmail.com> wrote:
>>>>
>>>>> Wait, nevermind. Don't ignore. I was able to recreate this issue on
>>>>> the command line using the abovementioned JDK. Could someone come back and
>>>>> take a look at this please?
>>>>>
>>>>> Sorry for jerking everyone around here. I have multiple JDK's and got
>>>>> mixed up on which one I was using.
>>>>>
>>>>> On Sun, Jul 16, 2023 at 2:26?AM David Alayachew <
>>>>> davidalayachew at gmail.com> wrote:
>>>>>
>>>>>> Hmmmm, this one might actually be IDE specific. Please ignore.
>>>>>>
>>>>>
>
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From davidalayachew at gmail.com  Tue Aug  8 20:28:55 2023
From: davidalayachew at gmail.com (David Alayachew)
Date: Tue, 8 Aug 2023 16:28:55 -0400
Subject: Illegal field name when trying to compile with a
 javax.swing.Action
In-Reply-To: <CAGqi2WmFST_nfto+n58YMc7dVmAgxFpYHOz64ARW2_o-pkbEzQ@mail.gmail.com>
References: <CAA9v-_Oo39GDpyXTDFrmbEGDBEWgTbD4WALFgOO2YweRJ1Nv_g@mail.gmail.com>
 <CAA9v-_OiVNJFNMUSj191YjEB5-Qn79wRkSZTTD6fF5WEszq=tw@mail.gmail.com>
 <CAA9v-_NNkg=+odbd7G6bOyy20H5rOkSBuRoa1SGSLSELEqnpRg@mail.gmail.com>
 <CABe8uE0Ncw9UkqcM4QPs4kyEAG+G+6divKwGPHgWtSJYiH+YKA@mail.gmail.com>
 <CAA9v-_MBDgM+Ns6iOORwF1y7Z_u4-769Psto8FZc-iY=-dJraw@mail.gmail.com>
 <CAA9v-_NEz6P=y9Aq28DRFJZWE6EB6o7GBEetqSBLbSJhsz+N3g@mail.gmail.com>
 <CAA9v-_NaM03g5oDhTsJ-93Ce8Z5jTTPCVq7uzJitTZboORVezg@mail.gmail.com>
 <1734640837.9801388.1691435449049.JavaMail.zimbra@univ-eiffel.fr>
 <CAGqi2WmFST_nfto+n58YMc7dVmAgxFpYHOz64ARW2_o-pkbEzQ@mail.gmail.com>
Message-ID: <CAA9v-_M3uOHzLyWoNuCUcXQ43vQX-CKzjKa1Zr4YtrgPu_0Kdg@mail.gmail.com>

I think you are correct. Regardless, another example to test against is
good to have.

On Tue, Aug 8, 2023 at 1:59?PM Florent Guillaume <
florent.guillaume at gmail.com> wrote:

> Hi,
>
> I believe this is https://github.com/openjdk/jdk/pull/15083
>
> Florent
>
> On Mon, Aug 7, 2023 at 9:12?PM Remi Forax <forax at univ-mlv.fr> wrote:
>
>> Hi David,
>> thanks for the bug report.
>>
>> I was able to reproduce the issue with the latest early acces of 22,
>> There is no issue if  "-g" is not specified, so the bug seems to be in
>> the debug information that are added to the classfile.
>>
>>   javac -g --enable-preview --source 22 GUI.java
>>
>> Here is a simpler reproducer
>>
>>
>> import java.util.function.Consumer;
>>
>> public class GUI {
>>    public static void main(String[] args) {
>>      Consumer<String> op = _ -> {};
>>    }
>> }
>>
>>
>> javap shows the issue, the LocalVariableTable is generated with the name
>> ""
>>
>>  private static void lambda$main$0(java.lang.String);
>>     descriptor: (Ljava/lang/String;)V
>>     flags: (0x100a) ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC
>>     Code:
>>       stack=0, locals=1, args_size=1
>>          0: return
>>       LineNumberTable:
>>         line 5: 0
>>       LocalVariableTable:
>>         Start  Length  Slot  Name   Signature
>>             0       1     0         Ljava/lang/String;
>>
>> The JVM spec 4.7.13 said
>> "
>> name_index
>>
>> The value of the name_index item must be a valid index into the
>> constant_pool table. The constant_pool entry at that index must contain
>> a CONSTANT_Utf8_info structure representing a valid unqualified name
>> denoting a local variable (?4.2.2
>> <https://docs.oracle.com/javase/specs/jvms/se20/html/jvms-4.html#jvms-4.2.2>
>> ).
>>
>> "
>>
>> And 4.2.2 said that the string must have at least one code point, so ""
>> is an invalid name, rightly rejected by the VM (the error message is just
>> not great, it's not about a field but a local variable name, here a
>> parameter inside the LocalVariableTable).
>>
>> So it's a bug in the compiler, I see two ways to fix it, either do not
>> generate a line in the LocalVariableTable if the parameter is unamed or use
>> "_" instead.
>>
>> regards,
>> R?mi
>>
>> ------------------------------
>>
>> *From: *"David Alayachew" <davidalayachew at gmail.com>
>> *To: *"amber-dev" <amber-dev at openjdk.org>
>> *Sent: *Sunday, August 6, 2023 4:31:54 PM
>> *Subject: *Re: Illegal field name when trying to compile with a
>> javax.swing.Action
>>
>> Also, here is my version info.
>>
>>
>> $ java --version
>> openjdk 21-ea 2023-09-19
>> OpenJDK Runtime Environment (build 21-ea+31-2444)
>> OpenJDK 64-Bit Server VM (build 21-ea+31-2444, mixed mode, sharing)
>>
>>
>> $ javac --version
>> javac 21-ea
>>
>>
>>
>> On Sun, Aug 6, 2023 at 7:31?PM David Alayachew <davidalayachew at gmail.com>
>> wrote:
>>
>>> Hello Amber Dev Team,
>>>
>>> I ran into a problem that I am not sure what the cause is. It only seems
>>> to occur when I am using unnamed variables.
>>>
>>>
>>> Here are the commands that I am using, as well as their outputs.
>>>
>>>
>>> $ javac -g -Xlint:all,-preview,-serial -Xdiags:verbose --enable-preview
>>> --source 21 GUI.java
>>> Note: GUI.java uses preview features of Java SE 21.
>>> Note: Recompile with -Xlint:preview for details.
>>>
>>>
>>> $ java --enable-preview GUI
>>> Error: LinkageError occurred while loading main class GUI
>>>         java.lang.ClassFormatError: Illegal field name "" in class GUI
>>>
>>> And here is the file that I am using.
>>>
>>>
>>> import javax.swing.JPanel;
>>> import javax.swing.JLabel;
>>> import javax.swing.JButton;
>>> import java.util.function.BiFunction;
>>>
>>> public class GUI
>>> {
>>>
>>>    public static void main(String[] args)
>>>    {
>>>
>>>       new GUI(null, null);
>>>
>>>    }
>>>
>>>    public GUI(final Object characterType, final Object icon)
>>>    {
>>>
>>>    }
>>>
>>>    private Object createConstraintPanel()
>>>    {
>>>
>>>       final JPanel constraintPanel = new JPanel();
>>>       final JButton              button = new JButton();
>>>
>>>       CREATE_INPUT_SANITIZATION:
>>>       {
>>>
>>>          BUTTON_ACTION_LISTENER:
>>>          {
>>>
>>>             button
>>>                .addActionListener
>>>                (
>>>                   _ ->
>>>                   {
>>>
>>>                      final BiFunction<String, Integer, JLabel>
>>> createLabel =
>>>                         (text, width) ->
>>>                         {
>>>
>>>                            return null;
>>>
>>>                         }
>>>                         ;
>>>
>>>                      final JButton remove = new JButton();
>>>                      remove
>>>                         .addActionListener
>>>                         (
>>>                            _ ->
>>>                            {
>>>
>>>
>>>                            }
>>>                         );
>>>
>>>                   }
>>>                )
>>>                ;
>>>
>>>          }
>>>
>>>       }
>>>
>>>       return constraintPanel;
>>>
>>>    }
>>>
>>> }
>>>
>>> Technically, this issue also occurs if even 1 of the 2 unnamed variables
>>> is turned into a real variable. But regardless, the point is, this fails at
>>> run time.
>>>
>>> Please let me know if there is anything I am missing.
>>>
>>> Thank you for your time and help!
>>> David Alayachew
>>>
>>>
>>> On Tue, Jul 18, 2023 at 1:54?AM David Alayachew <
>>> davidalayachew at gmail.com> wrote:
>>>
>>>> Ok, ty for the heads up.
>>>>
>>>> On Tue, Jul 18, 2023 at 1:18?AM - <liangchenblue at gmail.com> wrote:
>>>>
>>>>> Hi David,
>>>>> Please do not ask for technical support in the development mailing
>>>>> list. There's no proof that this issue is with the core libraries instead
>>>>> of the Java compiler or another component.
>>>>> I have already downloaded your zip, compiled the 4 files with JDK 22
>>>>> (my local dev build for another unrelated patch) javac --enable-preview
>>>>> -release 22 *.java and java --enable-preview ToDoList, which just shows up
>>>>> a UI without any crash. Without enable-preview, yoru code does not compile
>>>>> at all for the usage of _ as an identifier.
>>>>>
>>>>> This is most likely a problem with the compiler you are using; you
>>>>> have a gpj file, which probably means you are using jGrasp. Please report
>>>>> this issue to the relevant parties (i.e. the 3rd-party IDE or whatever
>>>>> supports using _ as identifer without --enable-preview) instead.
>>>>>
>>>>> Chen Liang
>>>>>
>>>>> On Tue, Jul 18, 2023 at 11:43?AM David Alayachew <
>>>>> davidalayachew at gmail.com> wrote:
>>>>>
>>>>>> Wait, nevermind. Don't ignore. I was able to recreate this issue on
>>>>>> the command line using the abovementioned JDK. Could someone come back and
>>>>>> take a look at this please?
>>>>>>
>>>>>> Sorry for jerking everyone around here. I have multiple JDK's and got
>>>>>> mixed up on which one I was using.
>>>>>>
>>>>>> On Sun, Jul 16, 2023 at 2:26?AM David Alayachew <
>>>>>> davidalayachew at gmail.com> wrote:
>>>>>>
>>>>>>> Hmmmm, this one might actually be IDE specific. Please ignore.
>>>>>>>
>>>>>>
>>
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