On Fri, 27 Oct 2023 17:40:12 GMT, Alan Bateman <al...@openjdk.org> wrote:
>> I reran the script you sent me few days ago and got the expected results
>> with the latest changes.
>> The checking of the main module name matches between dump time and runtime
>> is performed in the VM code. If an archive (even the default CDS archive
>> classes.jsa) is created with the -m option, running with just `java
>> -version` will disable the optimized module handling.
>>
>> [0.136s][info ][cds ] _archived_main_module_name m
>> [0.136s][info ][cds ] Module m specified during dump time but not
>> during runtime
>> [0.136s][info ][cds ] Disabling optimized module handling
>> [0.136s][info ][cds ] optimized module handling: disabled
>> [0.136s][info ][cds ] full module graph: disabled
>
>> I reran the script you sent me few days ago and got the expected results
>> with the latest changes. The checking of the main module name matches
>> between dump time and runtime is performed in the VM code. If an archive
>> (even the default CDS archive classes.jsa) is created with the -m option,
>> running with just `java -version` will disable the optimized module handling.
>>
>> ```
>> [0.136s][info ][cds ] _archived_main_module_name m
>> [0.136s][info ][cds ] Module m specified during dump time but not
>> during runtime
>> [0.136s][info ][cds ] Disabling optimized module handling
>> [0.136s][info ][cds ] optimized module handling: disabled
>> [0.136s][info ][cds ] full module graph: disabled
>> ```
>
> Can you check that ArchivedModuleGraph.archivedModuleGraph is null when
> disabled? When I tried it, it wasn't null so ModuleBootstrap has a module
> graph containing the modules for m.
The `ArchivedModuleGraph.java` wasn't changed. So if `-m` is not specified, the
`archivedModuleGraph` is non-null; if `-m` is specified, the
`archivedModuleGraph` is null.
So running `java -version`, the archivedModuleGraph is non-null, but the module
m won't be loaded from the archive. I'm seeing the following log output:
`[0.220s][debug][module ] define_module(): creation of module: m, version:
null, location: jrt:/m, loader data: 0x00007f201819dd60 for instance a
'jdk/internal/loader/ClassLoaders$AppClassLoader'{0x000000011f010500}, package
#: 1`
-------------
PR Review Comment: https://git.openjdk.org/jdk/pull/16016#discussion_r1374951369
