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org/apache/log4j/Layout
java.lang.NoClassDefFoundError: org/apache/log4j/Layout	at org.apache.commons.logging.impl.Log4jFactory.getInstance(Log4jFactory.java:140)	at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:257)	at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:390)	at net.sf.navigator.taglib.UseMenuDisplayerTag.(UseMenuDisplayerTag.java:38)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:140)