After git clone https://github.com/digama0/mmj2,
Success: compile with openjdk-11-jdk and runtime openjdk-11-jdk.
Every other combination of compiling/runtime I have available fails.
Here is the error message from compiling and running under openjdk-17-jdk:
Error: LinkageError occurred while loading main class mmj.util.BatchMMJ2
java.lang.UnsupportedClassVersionError: mmj/util/BatchMMJ2 has been
compiled by a more recent version of the Java Runtime (class file version
65.0), this version of the Java Runtime only recognizes class file versions
up to 61.0
William
On Friday, March 3, 2023 at 6:33:32 PM UTC-5 [email protected] wrote:
> By the way, if you are thinking about modernizing mmj2 there are two known
> issues with newer versions of the JDK. One is the missing nashorn support
> as already mentioned, and the other is an issue in the undo system which
> causes ComposedEdits to not work correctly (the required class doesn't
> exist on JDK 10+). It is being version-checked now so you shouldn't get any
> build failures, but the user experience is that undo goes one character at
> a time which is pretty miserable. Maybe there is something in newer
> versions of the JDK for this but I couldn't find anything useful in JDK 10.
> That's why I recommend JDK 9 for most mmj2 users.
>
> On Fri, Mar 3, 2023 at 6:26 PM David Crisp <[email protected]> wrote:
>
>>
>> On Friday, 3 March 2023 at 22:41:54 UTC [email protected] wrote:
>>
>> openjdk-11-jdk works on my system.
>>
>> Debian Sid
>> arm64
>> Java versions available to me: openjdk-8-jdk, openjdk-11-jdk,
>> openjdk-17-jdk, openjdk-18-jdk, openjdk-19-jdk, openjdk-20-jdk,
>> openjdk-21-jdk.
>>
>> openjdk-8-jdk: fails (error message posted below)
>> openjdk-11-jdk: success
>> openjdk-17-jdk: fails (error message posted below)
>> openjdk-18-jdk through openjdk-21-jdk: fails (all with the same error
>> message posted below)
>>
>>
>> The issue with JDK8 is what Mario suggests, and the issues with JDK18+
>> are what I'd expect from missing Nashorn support, but 17 is a weird one.
>> I'd expect it to fail for the same reason as 18 (Nashorn was removed in 14)
>> but it looks like it's not even getting that far and is instead having
>> trouble with loading the GUI libraries (libawt_xawt.so is the library that
>> implements Java's low-level windowing functionality on top of X11).
>>
>> I suspect this is an issue with your install of 17, but I don't currently
>> have an ARM system available to me so I can't test it myself with your
>> exact setup - would you mind please trying to uninstall and reinstall 17
>> for me and seeing if you get the same stacktrace? If you do I'll add it to
>> my list of things to investigate once I start diving into the code - 17 is
>> the most recent LTS version, so it's one that we really want mmj2 to work
>> with if at all possible.
>>
>> Thanks
>>
>> Dave
>>
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