Spring JPA and persistence xml

Question

I m trying to set up a Spring JPA Hibernate simple example WAR for deployment to Glassfish  I see some examples use a persistence xml file  and other examples do not  Some examples use a dataSource  and some do not  So far my understanding is that a dataSource is not needed if I have    lt persistence-unit name  educationPU      transaction-type  JTA  gt       lt provider gt org hibernate ejb HibernatePersistence lt  provider gt       lt class gt com coe jpa StudentProfile lt  class gt       lt properties gt           lt property name  hibernate connection driver class              value  com mysql jdbc Driver    gt           lt property name  hibernate connection url              value  jdbc mysql   localhost 3306 COE    gt           lt property name  hibernate connection username  value  root    gt           lt property name  show sql  value  true    gt           lt property name  dialect  value  org hibernate dialect MySQLDialect    gt       lt  properties gt   lt  persistence-unit gt    I can deploy fine  but my EntityManager is not getting injected by Spring   My applicationContext xml    lt bean id  entityManagerFactory  class  org springframework orm jpa LocalEntityManagerFactoryBean  gt       lt property name  persistenceUnitName  value  educationPU    gt   lt  bean gt    lt bean id  transactionManager  class  org springframework orm jpa JpaTransactionManager  gt       lt property name  entityManagerFactory  ref  entityManagerFactory    gt   lt  bean gt    lt bean class  org springframework orm jpa support PersistenceAnnotationBeanPostProcessor    gt    lt tx annotation-driven transaction-manager  transactionManager    gt    lt bean id  StudentProfileDAO  class  com coe jpa StudentProfileDAO  gt       lt property name  entityManagerFactory  ref  entityManagerFactory    gt   lt  bean gt    lt bean id  studentService  class  com coe services StudentService  gt   lt  bean gt    My class with the EntityManager   public class StudentService   private String  saveMessage  private String  showModal  private String modalHeader  private StudentProfile studentProfile  private String lastName  private String firstName    PersistenceContext unitName  educationPU   private EntityManager em    Transactional public String save         System out println      em      this em     em is null     this studentProfile  new StudentProfile        this saveMessage    saved       this showModal    true       this modalHeader   Information Saved       return  successs       My web xml      lt listener gt   lt listener-class gt org springframework web context ContextLoaderListener lt  listener-class gt      Are there any pieces I am missing to have Spring inject  em  in to StudentService

User · Answer

I have a test application set up using JPA Hibernate  amp  Spring  and my configuration mirrors yours with the exception that I create a datasource and inject it into the EntityManagerFactory  and moved the datasource specific properties out of the persistenceUnit and into the datasource   With these two small changes  my EM gets injected properly

User · Answer

If anyone wants to use purely Java configuration instead of xml configuration of hibernate  use this   You can configure Hibernate without using persistence xml at all in Spring like like this    Bean public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean     Map lt String  Object gt  properties   new Hashtable lt  gt     properties put  javax persistence schema-generation database action    none    HibernateJpaVendorAdapter adapter   new HibernateJpaVendorAdapter    adapter setDatabasePlatform  org hibernate dialect MySQL5InnoDBDialect      you can change this if you have a different DB LocalContainerEntityManagerFactoryBean factory   new LocalContainerEntityManagerFactoryBean    factory setJpaVendorAdapter adapter   factory setDataSource this springJpaDataSource     factory setPackagesToScan  package name    factory setSharedCacheMode SharedCacheMode ENABLE SELECTIVE   factory setValidationMode ValidationMode NONE   factory setJpaPropertyMap properties   return factory      Since you are not using persistence xml  you should create a bean that returns DataSource which you specify in the above method that sets the data source    Bean public DataSource springJpaDataSource     DriverManagerDataSource dataSource   new DriverManagerDataSource    dataSource setUrl  jdbc mysql   localhost SpringJpa    dataSource setUsername  tomcatUser    dataSource setPassword  password1234    return dataSource      Then you use  EnableTransactionManagement annotation over this configuration file  Now when you put that annotation  you have to create one last bean    Bean public PlatformTransactionManager jpaTransactionManager     return new JpaTransactionManager  this entityManagerFactoryBean   getObject         Now  don t forget to use  Transactional Annotation over those method that deal with DB    Lastly  don t forget to inject EntityManager in your repository  This repository class should have  Repository annotation over it

User · Answer

Just to confirm though you probably did     Did you include the    lt  --  tell spring to use annotation based congfigurations -- gt   lt context annotation-config   gt   lt  --  tell spring where to find the beans -- gt   lt context component-scan base-package  zz yy abcd    gt    bits in your application context xml   Also I m not so sure you d be able to use a jta transaction type with this kind of setup  Wouldn t that require a data source managed connection pool  So try RESOURCE LOCAL instead

User · Answer

This may be old  but if anyone has the same problem try changing unitname to just name in the PersistenceContext annotation   From   PersistenceContext unitName  educationPU     to   PersistenceContext name  educationPU

User · Answer

I m confused  You re injecting a PU into the service layer and not the persistence layer  I don t get that   I inject the persistence layer into the service layer  The service layer contains business logic and demarcates transaction boundaries  It can include more than one DAO in a transaction   I don t get the magic in your save   method either  How is the data saved   In production I configure spring like this    lt jee jndi-lookup id  entityManagerFactory  jndi-name  persistence ThePUname    gt    along with the reference in web xml  For unit testing I do this    lt bean id  entityManagerFactory      class  org springframework orm jpa LocalContainerEntityManagerFactoryBean      p dataSource-ref  dataSource  p persistence-xml-location  classpath  META-INF test-persistence xml      p persistence-unit-name  RealPUName  p jpaDialect-ref  jpaDialect      p jpaVendorAdapter-ref  jpaVendorAdapter  p loadTimeWeaver-ref  weaver  gt   lt  bean gt

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