On Thu, 25 Jan 2018 13:21:06 +0000, sebb wrote:
On 25 January 2018 at 13:01, Gilles <[email protected]>
wrote:
On Thu, 25 Jan 2018 12:21:25 +0000, sebb wrote:
On 25 January 2018 at 11:57, Gilles <[email protected]>
wrote:
On Thu, 25 Jan 2018 11:44:49 +0000, sebb wrote:
...
There are two ways to compile of Java 6:
Build with Java 6
Build with a later version, but use the profile: -Pjava-1.6
FTR: this does not seem to work anymore on Jenkins: Job
"commons-rng" had been failing for many days without notice.
What do you mean by 'without notice'?
- no notification to the mailing lists
- no-one seems to care about the failures
- something else?
Day "d", it worked; day "d+1" it didn't. No config change performed
by me. Remarks noted in the job description, not by me (by INFRA
people?).
And what is the failure?
AFAICT Commons-RNG is not using Java 6
Do you mean the library, or the Jenkins job (as currently
configured)?
The source code is certainly Java 6-compatible.
OK, I was fooled by the Jenkins -Pjava-1.8 setting.
A couple of days ago, I changed the Jenkins config to use JDK 8.
...
The POM directs the compiler to produce Java 6-compatible bytecode;
a local check confirmed that the class version was "50.0".
Yes, but it won't necessarily detect Java7+ syntax or methods.
so if there is a problem
related to Jenkins it is something different from problems using
-Pjava-1.6 which I assume also occur for local builds.
I suppose that Jenkins is there so that the projects can be compiled
and checked for compatibility in various consistent environments.
When configuring for Java 6, the following error occurs:
---CUT---
Exception in thread "main" java.lang.UnsupportedClassVersionError:
jenkins/maven3/agent/Maven35Main : Unsupported major.minor version
51.0
---CUT---
I seem to recall that newer versions of Jenkins and/or maven
required Java 7 (?).
Yes, that has been noted a few times on this list.
Jenkins needs Java 7+
So jobs that are targeted a Java 6 need special config e.g. with
-Pjava-1.6
Again, I think that was reported on this list a few months back.
That was my point above.
It worked when the config was modified according to the report.
Then, when I looked again a few days ago: build fails.
And unless I'm mistaken, no other _notice_ was reported here that
we should again update the Jenkins jobs.
Is there any project that still uses a Java 6 config on Jenkins?
[I had a look at the "Commons-ognl" job since no compilation has
been triggerred for more than 7 months, but although the description
indicates "-Pjava-1.5", it is actually configured for Java 7!]
Perhaps it could work with older versions of maven (?). But
how to concile old maven with new plugins (and keep up with
"commons-parent")?
Not sure what you mean here.
That perhaps it is not possible to run under Java 6 when the
tools require Java 7 or above...
If some combinations of tools is failing because of versions
incompatibilities, I'd suggest that Jenkins "templates" should
be provided (rather than having to attempt all sorts of doomed
combinations of the settings each time the build starts to fail
for unknown reasons).
Gilles
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