java.lang.IllegalStateException: No transactional EntityManager available

Question

Project use Hibernate (JPA), Spring and Maven. My entity and DAO in a separate JAR.

pom.xml:

<project ...>
    ...
    <artifactId>database</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>3.5.4-Final</version>
        </dependency>
    </dependencies>    
</project>

DAO:

public class AbstractDAO<T extends BaseEntity> implements GenericDAO<T> {


    private final Class<T> persistentClass;

    private EntityManager entityManager;

    public AbstractDAO(Class<T> entityClass) {
        super();
        this.persistentClass = entityClass;
    }

    @PersistenceContext
    public void setEntityManager(EntityManager entityManager) {
        this.entityManager = entityManager;
    }


    public EntityManager getEntityManager() {
        return entityManager;
    }

    ...

    public void fooBar() {
       //Exception from this line
       Session session = getEntityManager().unwrap(Session.class);
       ...
    }

    ....

}

I have a module, which use Spring.

pom.xml:

<project ...>
...
<artifactId>api</artifactId>

<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>${spring.version}</version>
    </dependency>
    ....
</dependencies>

 ...    
</project>

AppContext.xml:

<bean id="authService" scope="singleton" class="com.test.management.AuthServiceImpl" />

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" name="EntityManagerFactory">
        <property name="persistenceUnitName" value="default"></property>
        <property name="dataSource" ref="dataSource"></property>
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="showSql" value="true" />
                <property name="generateDdl" value="true" />
                <property name="databasePlatform" value="${db.dialect}" />
            </bean>
        </property>     
    </bean>

    <!-- Values are defined in db.properties -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${db.driver}" />
        <property name="url" value="${db.url}" />
        <property name="username" value="${db.username}" />
        <property name="password" value="${db.password}" />
    </bean>

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager" name="TransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"></property>
    </bean>

    <tx:annotation-driven />

    <bean id="userDAO" scope="singleton" class="com.test.database.dao.impl.UserDAOImpl">
    </bean>


    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />

</beans> 

Service:

public class AuthServiceImpl implements AuthService {

    @Autowired
    private UserDAO userDAO;


    @Override
    public void authorization() {
        userDAO.fooBar();

    }
}

When I'm trying to get the session from EntityManager, I catch this exception:

java.lang.IllegalStateException: No transactional EntityManager available
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:223)
    at $Proxy121.unwrap(Unknown Source) 

Solution 1

You must surround the method with the @Transactional annotation:

@Transactional
public void fooBar() {
   //Exception from this line
   Session session = getEntityManager().unwrap(Session.class);
   ...
}

And enable the spring @Transactional processing with the following declaration in your spring's xml configuration file (txManager is the id of the your manager).

<tx:annotation-driven transaction-manager="txManager" />

Solution 2

Try this ?

entityManager=entityManager.getEntityManagerFactory().createEntityManager();
Session session = (Session) entityManager.unwrap(Session.class);

Solution 3

None of this was working for me, I finally found that the issue was that I was making my method @Transactional instead I needed the class to be @Transactional

Comments

[eis]

so.. what kind of entity manager you expect to be available?

[Anthony Tsivarev]

Sorry, I described in detail the question. What do you mean? Unfortunately, I'm new to Hibernate.

[eis]

Ok, thank you for the added information. Are you within a transaction when you call the method, getting the exception?

[Anthony Tsivarev]

Well... I thought that working with a transaction is in automatic mode, because i use <tx:annotation-driven />

[eis]

it says it's annotation driven, you'll need to provide annotations to places that you need to be transactional. I don't see @Transactional annotations in your code.

[poussma]

i have added the piece of spring configuration

[daydreamer]

This works for me, what is the magic behind it? why @PersistenceContext EntityManager entityManager is not Transactional but entityManager.getEntityManagerFactory().createEntityManager(‌​); is?

[baybora.oren]

Shortly for my understanding; @PersistenceContext : is for application server usage (without transaction control if nothing configured). If you want it transactional you can add @Transactional annotation to make spring wrap it. createEntityManager : is for application control by spring) spring will make entityManager transactional (inject).

[VB_]

@baybora.oren do you mean @Transactional @PersistenceContext private EntityManager entityManager? That's not allowed

[VB_]

@baybora.oren look at stackoverflow.com/questions/27570641/… please

[baybora.oren]

@V_B @PersistenceContext private EntityManager entityManager; we cant use @Transactional because of before transactional proxy created we create entity manager.

[Shafin Mahmud]

@baybora what I actually understand, Here entityManager is being created explicitly, that is actually Application Managed Entity Managers . Container like Spring is not resposible for maintaing the life cycle for the EntityManager created from it. But you can @Autowire EntityManagerFactory directly as the bean is already configured in the applicationContext. Hence this could be simple like this emf.createEntityManager().unwrap(Session.class)' to get Session`

[djangofan]

I added that annotation to my Test method, and it works although i dont understand why.

[Mohammadreza Khatami]

I got this exception cause of session.beginTrasaction() beside @Transactional which was a mistake!

[royatirek]

It leaks connections. I have tested this code. We need to manage it manually.