why is log4 appender member is null? cannot init log4j
问题 I have this log4j.properties file # Root logger log4j.rootLogger=INFO, sift log4j.throwableRenderer=org.apache.log4j.OsgiThrowableRenderer log4j.configDebug = true # Sift appender log4j.appender.sift=org.apache.log4j.sift.MDCSiftingAppender log4j.appender.sift.key=session_id log4j.appender.sift.default=no_session_id log4j.appender.sift.appender=org.apache.log4j.FileAppender log4j.appender.sift.appender.layout=org.apache.log4j.PatternLayout log4j.appender.sift.appender.layout.ConversionPattern