java - Hibernate persitantBag class not found -

while trying deploy war file in tomcat 7, exception occur everytime java.lang.classnotfoundexception: org.hibernate.collection.persistentbag.

although using hibernate 4.3.2 jar file , class in other package (inside org.hibernate.collection.internal.persistentbag) in new version of hibernate jar file.

can 1 please let me know why searching file in package? have checked pom file , there no file related older hibernate version.

here stack trace :

nov 18, 2014 4:17:08 pm org.apache.catalina.session.standardmanager doload severe: classnotfoundexception while loading persisted sessions: java.lang.classnotfoundexception: org.hibernate.collection.persistentbag java.lang.classnotfoundexception: org.hibernate.collection.persistentbag     @ org.apache.catalina.loader.webappclassloader.loadclass(webappclassloader.java:1720)     @ org.apache.catalina.loader.webappclassloader.loadclass(webappclassloader.java:1571)     @ java.lang.class.forname0(native method)     @ java.lang.class.forname(class.java:270)     @ org.apache.catalina.util.customobjectinputstream.resolveclass(customobjectinputstream.java:74)     @ java.io.objectinputstream.readnonproxydesc(objectinputstream.java:1611)     @ java.io.objectinputstream.readclassdesc(objectinputstream.java:1516)     @ java.io.objectinputstream.readordinaryobject(objectinputstream.java:1770)     @ java.io.objectinputstream.readobject0(objectinputstream.java:1349)     @ java.io.objectinputstream.defaultreadfields(objectinputstream.java:1989)     @ java.io.objectinputstream.readserialdata(objectinputstream.java:1914)     @ java.io.objectinputstream.readordinaryobject(objectinputstream.java:1797)     @ java.io.objectinputstream.readobject0(objectinputstream.java:1349)     @ java.io.objectinputstream.readobject(objectinputstream.java:369)     @ org.apache.catalina.session.standardsession.readobject(standardsession.java:1595)     @ org.apache.catalina.session.standardsession.readobjectdata(standardsession.java:1060)     @ org.apache.catalina.session.standardmanager.doload(standardmanager.java:282)     @ org.apache.catalina.session.standardmanager.load(standardmanager.java:202)     @ org.apache.catalina.session.standardmanager.startinternal(standardmanager.java:489)     @ org.apache.catalina.util.lifecyclebase.start(lifecyclebase.java:150)     @ org.apache.catalina.core.standardcontext.startinternal(standardcontext.java:5476)     @ org.apache.catalina.util.lifecyclebase.start(lifecyclebase.java:150)     @ org.apache.catalina.core.containerbase.addchildinternal(containerbase.java:901)     @ org.apache.catalina.core.containerbase.addchild(containerbase.java:877)     @ org.apache.catalina.core.standardhost.addchild(standardhost.java:632)     @ org.apache.catalina.startup.hostconfig.deploywar(hostconfig.java:1073)     @ org.apache.catalina.startup.hostconfig$deploywar.run(hostconfig.java:1857)     @ java.util.concurrent.executors$runnableadapter.call(executors.java:471)     @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:334)     @ java.util.concurrent.futuretask.run(futuretask.java:166)     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1146)     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:615)     @ java.lang.thread.run(thread.java:701) nov 18, 2014 4:17:08 pm org.apache.catalina.session.standardmanager startinternal severe: exception loading sessions persistent storage java.lang.classnotfoundexception: org.hibernate.collection.persistentbag     @ org.apache.catalina.loader.webappclassloader.loadclass(webappclassloader.java:1720)     @ org.apache.catalina.loader.webappclassloader.loadclass(webappclassloader.java:1571)     @ java.lang.class.forname0(native method)     @ java.lang.class.forname(class.java:270)     @ org.apache.catalina.util.customobjectinputstream.resolveclass(customobjectinputstream.java:74)     @ java.io.objectinputstream.readnonproxydesc(objectinputstream.java:1611)     @ java.io.objectinputstream.readclassdesc(objectinputstream.java:1516)     @ java.io.objectinputstream.readordinaryobject(objectinputstream.java:1770)     @ java.io.objectinputstream.readobject0(objectinputstream.java:1349)     @ java.io.objectinputstream.defaultreadfields(objectinputstream.java:1989)     @ java.io.objectinputstream.readserialdata(objectinputstream.java:1914)     @ java.io.objectinputstream.readordinaryobject(objectinputstream.java:1797)     @ java.io.objectinputstream.readobject0(objectinputstream.java:1349)     @ java.io.objectinputstream.readobject(objectinputstream.java:369)     @ org.apache.catalina.session.standardsession.readobject(standardsession.java:1595)     @ org.apache.catalina.session.standardsession.readobjectdata(standardsession.java:1060)     @ org.apache.catalina.session.standardmanager.doload(standardmanager.java:282)     @ org.apache.catalina.session.standardmanager.load(standardmanager.java:202)     @ org.apache.catalina.session.standardmanager.startinternal(standardmanager.java:489)     @ org.apache.catalina.util.lifecyclebase.start(lifecyclebase.java:150)     @ org.apache.catalina.core.standardcontext.startinternal(standardcontext.java:5476)     @ org.apache.catalina.util.lifecyclebase.start(lifecyclebase.java:150)     @ org.apache.catalina.core.containerbase.addchildinternal(containerbase.java:901)     @ org.apache.catalina.core.containerbase.addchild(containerbase.java:877)     @ org.apache.catalina.core.standardhost.addchild(standardhost.java:632)     @ org.apache.catalina.startup.hostconfig.deploywar(hostconfig.java:1073)     @ org.apache.catalina.startup.hostconfig$deploywar.run(hostconfig.java:1857)     @ java.util.concurrent.executors$runnableadapter.call(executors.java:471)     @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:334)     @ java.util.concurrent.futuretask.run(futuretask.java:166)     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1146)     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:615)     @ java.lang.thread.run(thread.java:701) nov 18, 2014 4:17:09 pm org.apache.catalina.startup.hostconfig deploywar 

thanks abhishek