jsf 2 - Using JPA2 in Tomcat 6: @PersitenceContext doesn't work, EntityManager is null -

i using jsf2 pure jpa2. problem entitymanager,

@persistencecontext private entitymanager entitymanager; 

here entitymanager not getting injected , null. can 1 please me wrong in code.

here configuration.

user.java

    @entity     @table(name="user")     public class user {          private int id;         private string name;         private string surname;          @id         @sequencegenerator(name="user_id_seq_gen", sequencename="user_id_gen_seq", allocationsize=1)         @generatedvalue(strategy=generationtype.sequence, generator="user_id_seq_gen")         @column(name="id", unique = true, nullable = false)         public int getid() {             return id;         }          public void setid(int id) {             this.id = id;         }          @column(name="name", unique = true, nullable = false)         public string getname() {             return name;         }          public void setname(string name) {             this.name = name;         }          @column(name="surname", unique = true, nullable = false)         public string getsurname() {             return surname;         }          public void setsurname(string surname) {             this.surname = surname;         }         } 

persistence.xml

   <?xml version="1.0" encoding="utf-8"?>         <persistence xmlns="http://java.sun.com/xml/ns/persistence"                      xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"                      xsi:schemalocation="http://java.sun.com/xml/ns/persistence                       http://java.sun.com  /xml/ns/persistence/persistence_2_0.xsd" version="2.0">            <persistence-unit name="testunit" transaction-type="resource_local">               <provider>org.hibernate.ejb.hibernatepersistence</provider>               <non-jta-data-source>java:/comp/env/testds</non-jta-data-source>               <class>com.user.external.test.user</class>               <exclude-unlisted-classes>false</exclude-unlisted-classes>               <properties>                  <property name="hibernate.dialect" value="org.hibernate.dialect.oracle10gdialect"/>                  <property name="hibernate.max_fetch_depth" value="6"/>                  <property name="hibernate.show_sql" value="false"/>                  <property name="hibernate.format_sql" value="true"/>               </properties>            </persistence-unit>         </persistence> 

tomcat server.xml

    <context docbase="usertools" path="/usertools" reloadable="true">         <resourcelink name="testds"                    global="testds"                     type="javax.sql.datasource"/>     </context>  

testbean.java

    @managedbean(name="testbean")     @viewscoped     public class testbean implements serializable{          @managedproperty("#{testservice}")         private itestservice testservice;          public void savedata(user user){             testservice.saveuser(user);         }          public void settestservice(itestservice testservice){             this.testservice = testservice;         }          public itestservice gettestservice(){             return testservice;         }     } 

testserviceimpl.java

    @managedbean(name="testservice")     @applicationscoped     public class testserviceimpl implements itestservice {          @managedproperty(value="#{testdao}")         private itestdao testdao;          public void saveuser(user user){             testdao.saveuser(user);         }          public void settestdao(itestdao testdao){             this.testdao = testdao;         }          public itestdao gettestdao(){             return testdao;         }      }    

testdao.java

    @managedbean(name = "testdao")     @applicationscoped     public class testdao implements itestdao {          @persistencecontext         private entitymanager entitymanager; // null          public void saveuser(user user){             entitymanager.persist(user); // getting null pointer here....         }             public void setentitymanager(entitymanager entitymanager) {             this.entitymanager = entitymanager;         }          public entitymanager getentitymanager() {             return entitymanager;         }      } 

i have tried @persistencecontext name & unitname attributes. still not working. tried resource config in web.xml

    <persistence-context-ref>             <persistence-context-ref-name>testunit</persistence-context-ref-name>             <persistence-unit-name>testunit</persistence-unit-name>         </persistence-context-ref>          <resource-ref>             <description>db connection</description>             <res-ref-name>testunit</res-ref-name>             <res-type>javax.sql.datasource</res-type>             <res-auth>container</res-auth>         </resource-ref> 

still no luck. can 1 please me.

tomcat not java ee container, there limitations related container managed factories , dependency injection. among others, need manually create entitymanagerfactory , entitymanager.

hibernate documentation isn't clear on that, here's eclipselink one: tomcat/jpa tutorial. check "limitations jpa" section, applies hibernate.

see also:

• best practice entitymanagerfactory