JEL 477 Issue

[Jan Lahoda]

I've filled:

https://bugs.openjdk.org/browse/JDK-8338301


Thanks,

    Jan


On 13. 08. 24 13:06, Magnus Ihse Bursie wrote:
>
> If this is something that should be fixed, do we have a JBS issue 
> tracking it?
>
> /Magnus
>
> On 2024-07-30 19:43, Jonathan Gibbons wrote:
>>
>> Even without special-casing `main`, the error message is misleading 
>> because it says `class, interface, enum, or record expected` and does 
>> not admit the possibility of `void` in this particular circumstance.
>>
>> -- Jon
>>
>>
>> On 7/30/24 9:57 AM, Remi Forax wrote:
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
>>>     *From: *"Jaikiran Pai" <jai.forums2013 at gmail.com>
>>>     *To: *"jdk-dev" <jdk-dev at openjdk.org>
>>>     *Sent: *Tuesday, July 30, 2024 5:43:34 PM
>>>     *Subject: *Re: JEL 477 Issue
>>>
>>>     > import module java.base;
>>>     >
>>>     > main() {
>>>     >
>>>     >    println("Moose");
>>>     >
>>>     >}
>>>
>>>     It appears that you are missing a "void" return type before the
>>>     main() method name. As noted in the JEP-477, it should be:
>>>
>>>     import module java.base;
>>>     void main() {
>>>         println("Moose");
>>>     }
>>>
>>>
>>> that said, if we want beginners to be able to use that syntax, the 
>>> error message should be changed because the current message is 
>>> misleading and not very helpfull (javac should recognize "main" and 
>>> have a tailored error message).
>>>
>>> @Ken, you do not need to import module java.base, it's done by 
>>> default and --source 23 is not needed anymore since 23.
>>>
>>>
>>>     -Jaikiran
>>>
>>>
>>> regards,
>>> Rémi
>>>
>>>
>>>     On 30/07/24 9:05 pm, omniprof at gmail.com wrote:
>>>
>>>         I apologize for posting what is likely a trivial question
>>>         that may be inappropriate for this list but I cannot find
>>>         anywhere in my searches to explain what is going wrong.
>>>         Simply put JEP 477 does not work in the pre-release version
>>>         of Java 23 on a Windows 11 PC. There is a lot written that
>>>         all show a similar example.
>>>
>>>         *>> Here is the program*
>>>
>>>         import module java.base;
>>>
>>>         main() {
>>>
>>>             println("Moose");
>>>
>>>         }
>>>
>>>         *>> Here is the version of Java I am running*
>>>
>>>         C:\dev\Onramptesting\OnRamptest\src>java --version
>>>
>>>         openjdk 23-ea 2024-09-17
>>>
>>>         OpenJDK Runtime Environment (build 23-ea+34-2361)
>>>
>>>         OpenJDK 64-Bit Server VM (build 23-ea+34-2361, mixed mode,
>>>         sharing)
>>>
>>>         *>> Here I run the code with all the required switches. The
>>>         errors are the same with or without Xlint*
>>>
>>>         C:\dev\Onramptesting\OnRamptest\src>javac --enable-preview
>>>         --source 23 -Xlint:preview Main.java
>>>
>>>         Main.java:1: warning: [preview] module imports are a preview
>>>         feature and may be removed in a future release.
>>>
>>>         import module java.base;
>>>
>>>                ^
>>>
>>>         Main.java:3: error: class, interface, enum, or record expected
>>>
>>>         main() {
>>>
>>>         ^
>>>
>>>         Main.java:5: error: class, interface, enum, or record expected
>>>
>>>         }
>>>
>>>         ^
>>>
>>>         2 errors
>>>
>>>         1 warning
>>>
>>>         Note that I get the same results for –source 23 and –release 23
>>>
>>>         Trying single file:
>>>
>>>         java –enable-preview Main.java
>>>
>>>         does not work as well.
>>>
>>>         Same result using Console or PowerShell in Windows.
>>>
>>>         What am I doing wrong?
>>>
>>>         Ken Fogel
>>>
>>>         omniprof at gmail.com
>>>
>>>
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