I'm doing some web application which using displatag taglib which is depends on slf4j lib.

The problem is when i startup my application, it failed and shows the following error :

[2007/11/30 12:25:41] C:\dev\workspace\CheltenhamWeb\src\webapp\WEB-INF\web.xml:52: java.lang.NoSuchMethodError: org.apache.log4j.Logger.isTraceEnabled()Z
java.lang.NoSuchMethodError: org.apache.log4j.Logger.isTraceEnabled()Z
at org.slf4j.impl.Log4jLoggerAdapter.isTraceEnabled(Log4jLoggerAdapter.java:81)
at org.apache.commons.logging.impl.SLF4JLocationAwareLog.isTraceEnabled(SLF4JLocationAwareLog.java:61)
at org.hibernate.type.NullableType.<clinit>(NullableType.java:28)
at org.hibernate.Hibernate.<clinit>(Hibernate.java:76)
at org.hibernate.type.TypeFactory.<clinit>(TypeFactory.java:46)
at org.hibernate.mapping.ManyToOne.getType(ManyToOne.java:22)
at org.hibernate.mapping.ManyToOne.createForeignKey(ManyToOne.java:32)
at org.hibernate.cfg.HbmBinder.createProperty(HbmBinder.java:1782)
at org.hibernate.cfg.HbmBinder.createClassProperties(HbmBinder.java:1751)
at org.hibernate.cfg.HbmBinder.bindRootPersistentClassCommonValues(HbmBinder.java:317)
at org.hibernate.cfg.HbmBinder.bindRootClass(HbmBinder.java:235)
at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:151)
at org.hibernate.cfg.Configuration.add(Configuration.java:360)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:397)
at org.hibernate.cfg.Configuration.addResource(Configuration.java:446)
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1313)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1285)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1267)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1234)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1162)
at com.vcint.persistence.hibernate.HibernateSessionFactory.buildNConfigure(HibernateSessionFactory.java:116)
at com.vcint.persistence.hibernate.HibernateSessionFactory.<init>(HibernateSessionFactory.java:65)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
at java.lang.Class.newInstance0(Class.java:308)
at java.lang.Class.newInstance(Class.java:261)
at com.vcint.persistence.hibernate.HibernateFactory.instantiateClass(HibernateFactory.java:40)
at com.vcint.commons.locator.ResourceBinder.bindLocator(ResourceBinder.java:42)
at com.vcint.persistence.hibernate.HibernateFactory.getHibernateManager(HibernateFactory.java:29)
at com.vcint.persistance.HibernateInitialiser.init(HibernateInitialiser.java:15)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.caucho.util.BeanUtil.configure(BeanUtil.java:401)
at com.caucho.util.BeanUtil.createBean(BeanUtil.java:153)
...

is that something to do with the slf4j library??