tomcat - hibernate.jpa.HibernatePersistenceProvider cannot be cast to javax.persistence.spi.PersistenceProvider -

im using vaadin develop ui application running hibernate 4.3.1 i'm trying bind data vaadin jpacontainer use in grid component allow lazy-loading. when try , create entitymanager throws following error

java.lang.classcastexception: org.hibernate.ejb.hibernatepersistence cannot cast javax.persistence.spi.persistenceprovider @ javax.persistence.persistence.createentitymanagerfactory(persistence.java:54) @ javax.persistence.persistence.createentitymanagerfactory(persistence.java:39) @ com.vaadin.addon.jpacontainer.jpacontainerfactory.createentitymanagerforpersistenceunit(jpacontainerfactory.java:122) @ com.vaadin.addon.jpacontainer.jpacontainerfactory.make(jpacontainerfactory.java:105) 

i used hibernate-jpa-2.1-api-1.0.0.final.jar persistence-api-1.0.2.jar import enitymanager keep getting same error

here class create entitymanager

 public class workmanager{     public static void create() {     dataaccess dao= new dataaccess();      entitymanager em = persistence  //error here             .createentitymanagerfactory("myui")             .createentitymanager();      em.gettransaction().begin();     dao.init();     list<work> list = dao.findall(); //get rows in table     em.persist(list);     dao.close();     em.gettransaction().commit(); } 

persistence.xml

 <?xml version="1.0" encoding="utf-8"?>  <persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">  <persistence-unit name="myproject">     <!-- specify jpa provider use -->     <provider>org.hibernate.jpa.hibernatepersistenceprovider</provider>      <!-- entity beans go here -->     <class>com.dao.model.work</class>       <properties>         <!-- db connection properties -->         <property name="javax.persistence.jdbc.url" value="jdbc:sqlserver://s12345:1111;databasename=dbname" />         <!-- property name="javax.persistence.jdbc.url" value="jdbc:sqlserver://l71111:1111;databasename=dbname" / -->         <property name="javax.persistence.jdbc.user" value="iasys" />         <property name="javax.persistence.jdbc.password" value="password" />         <property name="javax.persistence.jdbc.driver" value="com.microsoft.sqlserver.jdbc.sqlserverdriver" />          <!-- settings c3p0 connection pooling -->         <property name="hibernate.connection.provider_class" value="org.hibernate.connection.c3p0connectionprovider" />         <property name="hibernate.c3p0.max_size" value="100" />         <property name="hibernate.c3p0.min_size" value="0" />         <property name="hibernate.c3p0.acquire_increment" value="1" />         <property name="hibernate.c3p0.idle_test_period" value="300" />         <property name="hibernate.c3p0.max_statements" value="0" />         <property name="hibernate.c3p0.timeout" value="100" />     </properties> </persistence-unit> 

in class create jpacontainer

 private jpacontainer<work> container = jpacontainerfactory.make(work.class,             jpaprojectui.persistence_unit);  grid.setcontainerdatasource(container); 

and here entitymanager called

public class jpapojectui extends ui { private static final long serialversionuid = 1l; public static final string persistence_unit = "myproject";  static {     workmanager.create(); }  @override protected void init(vaadinrequest request) {     setcontent(new mainui()); } 

i following addressbook demo came jpacontainer add-on

i'm using tomcat 8 run application

does have idea why happening? please feel free ask me more info if problem isn't clear!

here jars in web-inf folder

i added project build path has following list of jars

thanks

please remove persistence-api-1.0.2.jar web application , see results. there conflict between hibernate-jpa , persistance-api