Using jettyRun with a webapp that contains SLF4J bindings causes warnings to be printed since Gradle's bindings are also visible to the webapp:
:jettyRunSLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/local/share/java/gradle/lib/logback-classic-0.9.18.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/Users/jeppe/.gradle/cache/org.slf4j/slf4j-log4j12/jars/slf4j-log4j12-1.5.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
This may cause unpredictable logging since it is not clear which logging backend is being used....