Caused by: java.lang.LinkageError: loader constraint violation: when resolving method "org.slf4j.impl.StaticLoggerBinder.getLoggerFactory()Lorg/slf4j/ILoggerFactory;"

[visola]

I started having this problem after I updated from version 0.0.17 to 0.0.24. It seems that it started happening between version 0.0.23 and 0.0.24.

It seems to be some conflict between SLF4J versions from Jetty and the one I and Spring are using. I'm using only API version 1.7.6. You can see the whole code here: https://github.com/visola/bearprogrammer-examples/tree/master/gradle-integration-test

It's a sample that I've been working for a blog post that I'm writing. If you download that code and run jettyRun you should get the the error and the stack trace. I'm attaching a part of the log:

I'm running in Oracle Java 7.0.60:

------------------------------------------------------------
Gradle 1.10
------------------------------------------------------------

Build time:   2013-12-17 09:28:15 UTC
Build number: none
Revision:     36ced393628875ff15575fa03d16c1349ffe8bb6

Groovy:       1.8.6
Ant:          Apache Ant(TM) version 1.9.2 compiled on July 8 2013
Ivy:          2.2.0
JVM:          1.7.0_60 (Oracle Corporation 24.60-b09)
OS:           Mac OS X 10.9.3 x86_64

[akhikhl]

OK, I'll have a look at the problem and find a solution.

[akhikhl]

The problem is reproducible on jdk-7, not reproducible on jdk-8.
Fix for jdk-7:

runtime 'ch.qos.logback:logback-classic:1.1.2'

[visola]

Thanks for looking into this. I was stuck for a few days until I finally managed to scope down the problem. Do you know what exactly this is all about? Adding logback sounds more like a work around. If someone would like to use some other logging implementation with SLF4J, this may not be an option.

[akhikhl]

That was a quick and dirty solution, yes. I'll look deeper into dependencies of your project to understand what's the root of the problem.

[alexejk]

I'm actually getting this problem on JDK-8.. it was working perfectly until today and now the whole hell broke loose and it doesn't seem to be working for me anymore :(

Did you have a chance to dig into this more?

[akhikhl]

@alexejk, please open a new issue and post the complete log (if inconvenient to post it on github, send it over email).