classlist different from OpenJDK built by Oracle

[marschall]

When I compare the lib/classlist files of OpenJDK 11 built by Oracle and AdoptOpenJDK 11 the contents are different (the contents seem to be unsorted first, so I had to pipe the through sort first)

The following is the output of diff

< java/time/DayOfWeek
< java/time/Month
< java/time/temporal/TemporalAdjusters
< java/time/zone/ZoneOffsetTransition
< java/time/zone/ZoneOffsetTransitionRule$1
< java/time/zone/ZoneOffsetTransitionRule$TimeDefinition
< java/util/zip/CRC32
< java/util/zip/Checksum
< java/util/zip/Checksum$1
< sun/nio/cs/Surrogate
< sun/nio/cs/Surrogate$Parser
< sun/nio/cs/US_ASCII$Encoder
> sun/nio/cs/UTF_8$Encoder
< sun/util/calendar/ZoneInfoFile$Checksum

• < means present in OpenJDK 11 built by Oracle but missing in AdoptOpenJDK 11
• > means missing in OpenJDK 11 built by Oracle but present in AdoptOpenJDK 11, only sun/nio/cs/UTF_8$Encoder

[johnoliver]

well even if it is not listed in lib/classlist. At least for DayOfWeek, it is present in src.zip.
The class is present when you run jmod list jmods/java.base.jmod

And the following program successfully compiles and runs

import java.time.DayOfWeek;
public class TestDayOfWeek {
    public static void main(String[] args) {
        DayOfWeek day = DayOfWeek.of(1);
        System.out.println(day.toString());
    }
}

So why it is not in lib/classlist I dont know, but that class is present

[apjanke]

I am seeing similar, but apparently backward results. Many of these classes are present in the lib/classlist for an AdoptOpenJDK build I did from source, but are absent from the Oracle JDK 11.0.1 that I downloaded from oracle.com.

This is on macOS 10.13.6.

$ cd tmp
[~/tmp]
$ sort ~/local/repos/openjdk-build/workspace/build/src/build/macosx-x86_64-normal-server-release/images/jdk/lib/classlist > classlist-adoptopenjdk
[~/tmp]
$ sort /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home/lib/classlist > classlist-oracle
[~/tmp]
$ diff classlist-adoptopenjdk classlist-oracle
5d4
< java/io/ByteArrayOutputStream
14d12
< java/io/Externalizable
375d372
< java/security/CodeSigner
419d415
< java/time/DayOfWeek
427d422
< java/time/Month
479d473
< java/time/temporal/TemporalAdjusters
493,495d486
< java/time/zone/Ser
< java/time/zone/TzdbZoneRulesProvider
< java/time/zone/ZoneOffsetTransition
497,498d487
< java/time/zone/ZoneOffsetTransitionRule$1
< java/time/zone/ZoneOffsetTransitionRule$TimeDefinition
500,501d488
< java/time/zone/ZoneRulesProvider
< java/time/zone/ZoneRulesProvider$1
736d722
< java/util/jar/JarVerifier
848,850d833
< java/util/zip/CRC32
< java/util/zip/Checksum
< java/util/zip/Checksum$1
1025a1009,1010
> jdk/internal/vm/PostVMInitHook
> jdk/internal/vm/PostVMInitHook$1
1089d1073
< sun/security/util/ManifestEntryVerifier
1105d1088
< sun/util/calendar/ZoneInfoFile$Checksum

Does anyone know where the code that generates lib/classlist lives?

[karianna]

Adopt hasn't released an 11.0.1 yet....

[gdams]

@marschall can this be closed?

[karianna]

I think this warrants further investigation.

[marschall]

I checked with 11.0.2 and the following classes are sill missing from classlist compared to the builds by Oracle

< java/time/DayOfWeek
< java/time/Month
< java/time/temporal/TemporalAdjusters
< java/time/zone/ZoneOffsetTransition
< java/time/zone/ZoneOffsetTransitionRule$1
< java/time/zone/ZoneOffsetTransitionRule$TimeDefinition
< java/util/zip/Checksum
< java/util/zip/Checksum$1
< java/util/zip/CRC32
< sun/nio/cs/Surrogate
< sun/nio/cs/Surrogate$Parser
< sun/nio/cs/US_ASCII$Encoder
> sun/nio/cs/UTF_8$Encoder
< sun/util/calendar/ZoneInfoFile$Checksum

So the situation remains unchanged.

[marschall]

I am not sure but I believe this file is used for the default CDS archive:
https://archive.fosdem.org/2018/schedule/event/class_data_sharing/