| Re: [cross-project-issues-dev] Can SLF4J be made the official logging API for Eclipse projects? |
Hi
Indeed, and java.util.logging and logback.
My attempts to use SLF4J in OCL have foundered. Migrating the
plugins was easy, although RSI-inducing. Test harnesses which
represent an 'overall application' must continue to use their
log4j proprietary tweaks, but making this work enters a hotchpotch
world of fragments and smart class loaders. Eventually I gave up;
too time consuming for purely cosmetic value. It is far from clear
which of the three rival LOG4J for SLF4J in Orbit is the right
one. After major failures with Apache conflicts, I settled on the
fragment, whose fragment-host readme-bundles suggests an out of
date predecessor to Require-Capability that doesn't seem to work
for all the class loaders. AFAICT SLF4J and/or P2 fragment
declarations are not yet ready for prime time. I never even got as
far as struggling to make the migrated tests work on Tycho.
Wrt Xtext, there will almost certainly be some new magic to ensure that an Xtext application has a fallback Log4j logger rather than the default NOP logger.
Regards
Ed Willink
On Sat, Jan 25, 2020 at 10:56 AM Ed Willink <ed@xxxxxxxxxxxxx> wrote:
Hi
I've started to action this for OCL;
https://bugs.eclipse.org/bugs/show_bug.cgi?id=559532
and hit a silly problem; who redistributes SLF4J?
If it's standard, surely the platform should redistribute so that a copy
can be found in e.g. eclipse-SDK-4.14-win32-x86_64.zip ?
Platform doesn't use slf4j nor log4j thus it makes no sense to redistribute them. I should add to the mix that there is the OSGi LogService which might be the proper API to use in OSGi projects as it will not add yet another dependency. I'm not an expert in the area so I would appreciate some more guidance in case what I said is not correct.
There is no SLF4J there. There is no log4j either. Where does log4j come
form? It turns out that EGit redistributes both log4j and SLF4J. Very
helpful, but surely not right?
What is the preferred policy for redistribution of SLF4J? Does every
project need to redistribute it itself to avoid piggy-backing on EGit or
mandating that users manually add Orbit to their Install sites?
Regards
Ed Willink
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Alexander KurtakovRed Hat Eclipse Team
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