[jdk11u-dev] It is no longer possible to build jdk11u with a jdk10 boot JDK and --with-jtreg

[Jonathan Gibbons]

The philosophy behind the N-1 rule is to use a recent GA version.

With our current fast cadence of releases, half the time you need N-2 to 
get a recent GA version.   Fir example, later this week, after we fork 
the repos for JDK 23, it will be the case that because 23 is not 
released yet, you will need 22 to build the dev versions of 24.

All of which is to say the N-1 is not absolute. For update releases, it 
would seem to be reasonable to use a GA release of N to build an update 
release of N.

-- Jon


On 6/5/24 12:53 AM, Frederic Thevenet wrote:
> Hi,
>
> The build guide over on openjdk.org states that the "the boot JDK for 
> building JDK major version N should be a JDK of major version N-1".
> This, however, appears to no longer be possible for 11u since 
> 11.0.24+3 under certain circumstances.
> Starting with the backport of 8314495[2], 'configure' now enforces 
> that the version of jtreg passed using '--with-jtreg' is 7.3.1 or 
> higher  as it now requires jtreg 7.3.1 [1] and fails if this is not 
> the case.
> Jtreg 7.x, however, requires jdk11 or higher.
>
> As a result, when attempting to build jdk11u from the latest tag with  
> a jdk 10 bootJDK, you'll either be presented with the following error 
> when running configure with jtreg 6.x:
> "configure: error: jtreg version is too old, at least version 7.3.1 is 
> required"
>
> Or the following error when using jtreg 7.3.1:
> "checking jtreg version number... Error: LinkageError occurred while 
> loading main class com.sun.javatest.regtest.Main
>     java.lang.UnsupportedClassVersionError: 
> com/sun/javatest/regtest/Main has been compiled by a more recent 
> version of the Java Runtime (class file version 55.0), this version of 
> the Java Runtime only recognizes class file versions up to 54.0"
>
> As a result, it is only possible to successfully run configure using 
> jdk11 as the bootJDK, which is in direct contradiction with the 
> statement from the openjdk build guide, so I think it is important 
> that things are clarified in one way or another.
>
> Regards,
> Frederic
>
> [1] 
> https://htmlpreview.github.io/?https://raw.githubusercontent.com/openjdk/jdk/master/doc/building.html#boot-jdk-requirements
> [2] https://github.com/openjdk/jdk11u-dev/pull/2612
>