Logging from plugin framework does not get sent to log file, instead goes to standard error with unusual format

Jul 5, 2010 1:09:36 PM org.springframework.osgi.extender.internal.activator.ContextLoaderListener start
INFO: Starting [org.springframework.osgi.extender] bundle v.[1.2.1]
Jul 5, 2010 1:09:36 PM org.springframework.osgi.extender.internal.support.ExtenderConfiguration <init>
INFO: Detected extender custom configurations at {bundle://2.0:0/META-INF/spring/extender/spring-event-bridge.xml}
Jul 5, 2010 1:09:36 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.osgi.context.support.OsgiBundleXmlApplicationContext@210a5750: display name [OsgiBundleXmlApplicationContext(bundle=org.springframework.osgi.extender, config=bundle://2.0:0/META-INF/spring/extender/spring-event-bridge.xml)]; startup date [Mon Jul 05 13:09:36 EST 2010]; root of context hierarchy
Jul 5, 2010 1:09:36 PM org.springframework.osgi.context.support.AbstractOsgiBundleApplicationContext unpublishContextAsOsgiService
INFO: Application Context service already unpublished
Jul 5, 2010 1:09:36 PM org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
INFO: Bean factory for application context [org.springframework.osgi.context.support.OsgiBundleXmlApplicationContext@210a5750]: org.springframework.beans.factory.support.DefaultListableBeanFactory@1201f5bc
Jul 5, 2010 1:09:36 PM org.springframework.osgi.context.support.AbstractOsgiBundleApplicationContext publishContextAsOsgiServiceIfNecessary
INFO: Publishing application context as OSGi service with properties {org.springframework.context.service.name=org.springframework.osgi.extender, Bundle-SymbolicName=org.springframework.osgi.extender, Bundle-Version=1.2.1}
Jul 5, 2010 1:09:36 PM org.springframework.scheduling.timer.TimerTaskExecutor afterPropertiesSet
INFO: Initializing Timer