[logback-user] Jetty conflict

[Aleksey Didik]

Hello,
I have caught a problem of using embedded Jetty and slf4j, may be you 
can help me.

Jetty tell me this one:

  java.lang.LinkageError: loader constraint violation: when resolving 
method 
"org.slf4j.impl.StaticLoggerBinder.getLoggerFactory()Lorg/slf4j/ILoggerFactory;" 
the
  class loader (instance of org/eclipse/jetty/webapp/WebAppClassLoader) 
of the current class, org/slf4j/LoggerFactory, and the class loader 
(instance of sun/misc
/Launcher$AppClassLoader) for resolved class, 
org/slf4j/impl/StaticLoggerBinder,  have different Class objects for the 
type org/slf4j/ILoggerFactory used in the
signature [main o.e.j.u.l.Slf4jLog.warn:111]

I have next jars:

Embedded Jetty classpath:
      slf4j-api-1.5.10.jar
      logback-classic-0.9.18.jar

War libs:
      slf4j-api-1.5.10.jar

But I add
      slf4j-api-1.5.10.jar
      logback-classic-0.9.18.jar
to WAR libs and delete
     logback-classic-0.9.18.jar
from jetty classpath, all work fine.

Best regards,
Aleksey Didik