when i run a simple webapplication using jboss hibernate & eclipse then i gives error that written below but i that jar file it is present (class)
what will i do for it
actually i added that collection jar files in my class path but still it giver that error my struture is
src
/test
Name.java
Name.hbm.xml
hibernate.cfg.xml(it is in srs folder)

java.lang.NoClassDefFoundError: org/apache/commons/collections/SequencedHashMap
at org.hibernate.mapping.Table.<init>(Table.java:33)
at org.hibernate.cfg.Mappings.addTable(Mappings.java:116)
at org.hibernate.cfg.HbmBinder.bindRootPersistentClassCommonValues(HbmBinder.java:250)
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 pack.HibernateSessionFactory.initSessionFactory(HibernateSessionFactory.java:52)
at pack.HibernateSessionFactory.getInstance(HibernateSessionFactory.java:26)
at pack.serve.doGet(serve.java:36)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
at java.lang.Thread.run(Unknown Source)

Double and triple check classpath to include all the necessary jars, and then recheck again that the classpath is actually used in the runtime.