IllegalAccessError org.apache.log4j

Issue

2010-09-30 18:57:15,046 ERROR [org.apache.catalina.core.ContainerBase] Error configuring application listener of class org.springframework.web.context.request.RequestContextListener
java.lang.IllegalAccessError: tried to access field org.apache.log4j.Priority.level from class org.apache.log4j.Hierarchy
at org.apache.log4j.Hierarchy.setThreshold(Hierarchy.java:185)
at org.apache.log4j.Hierarchy.<init>(Hierarchy.java:95)
at org.apache.log4j.LogManager.<clinit>(LogManager.java:82)
at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:73)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:242)
at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:156)
at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:132)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:645)
at org.springframework.web.context.request.RequestContextListener.<init>(RequestContextListener.java:55)