Why do "Oracle JDK 10 builds" not support AppCDS?

[Jiangli Zhou]

Hi Volker,

This is intentional for JDK 10. According to the license of Oracle JDK 10, the UseAppCDS option requires -XX:+UnlockCommercialFeatures. For OpenJDK, UseAppCDS can be enabled without -XX:+UnlockCommercialFeatures. The CDS/AppCDS functionality in both Oracle JDK 10 and OpenJDK 10 are identical.

Thanks,
Jiangli

> On Feb 15, 2018, at 7:48 AM, Volker Simonis <volker.simonis at gmail.com> wrote:
> 
> Hi,
> 
> I know that this is an OpenJDK mailing list but maybe this is still
> interesting for some of us :)
> 
> I'm a little surprised to see that the "Oracle JDK 10" early access
> builds from http://jdk.java.net/10 do not support AppCDS:
> 
> ./jre-10-ea+43/bin/java -version
> java version "10" 2018-03-20
> Java(TM) SE Runtime Environment 18.3 (build 10+43)
> Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10+43, mixed mode)
> 
> ./jre-10-ea+43/bin/java -XX:+UseAppCDS -version
> Error: Trying to use 'UseAppCDS', but commercial features are not
> available in this VM.
> 
> while the OpenJDK builds do support it:
> 
> ./jdk-10/bin/java -XX:+UseAppCDS -version
> openjdk version "10" 2018-03-20
> OpenJDK Runtime Environment 18.3 (build 10+43)
> OpenJDK 64-Bit Server VM 18.3 (build 10+43, mixed mode)
> 
> Is this intentional or a mistake? I thought the goal was that Oracle
> and OpenJDK builds should be the same apart from the license under
> which they are provided. AppCDS is on the list of JEPs included in
> OpenJDK 10 and it seems strange if some of them will not be in Oracle
> JDK 10 (until now it was usually t he other way round :)
> 
> Regards,
> Volker