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java - Hibernate Could not obtain transaction-synchronized Session for current thread

问题描述:

I have been having a similar problem as many people have been having, but I can't seem to figure out what is going wrong in my specific case. I am making a simple database call to test the database connection, and Hibernate is throwing the following exception:

Exception in thread "main" org.hibernate.HibernateException: Could not obtain transaction-synchronized Session for current thread

at org.springframework.orm.hibernate4.SpringSessionContext.currentSession(SpringSessionContext.java:134)

at org.hibernate.internal.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:1014)

at boardwalk.computeServer.dao.DbDaoHibernateImpl.getInterpolationJob(DbDaoHibernateImpl.java:73)

at boardwalk.computeServer.ComputeServer.test(ComputeServer.java:39)

at boardwalk.computeServer.ComputeServer.main(ComputeServer.java:32)

Here is the relevant code and configuration:

pom.xml:

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven- 4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>

<groupId>boardwalk</groupId>

<artifactId>computeServer</artifactId>

<version>1.0</version>

<packaging>jar</packaging>

<name>marketserver</name>

<url>http://maven.apache.org</url>

<properties>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

</properties>

<dependencies>

<dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

<version>4.11</version>

<scope>test</scope>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-core</artifactId>

<version>4.1.1.RELEASE</version>

</dependency>

<dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

<version>5.1.33</version>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-beans</artifactId>

<version>4.1.1.RELEASE</version>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-aspects</artifactId>

<version>4.1.1.RELEASE</version>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-context</artifactId>

<version>4.1.1.RELEASE</version>

</dependency>

<dependency>

<groupId>javax.transaction</groupId>

<artifactId>jta</artifactId>

<version>1.1</version>

</dependency>

<dependency>

<groupId>activesoap</groupId>

<artifactId>jaxp-api</artifactId>

<version>1.3</version>

</dependency>

<dependency>

<groupId>org.hibernate</groupId>

<artifactId>hibernate-core</artifactId>

<version>4.3.7.Final</version>

</dependency>

<dependency>

<groupId>org.apache.activemq</groupId>

<artifactId>activemq-all</artifactId>

<version>5.10.0</version>

</dependency>

<dependency>

<groupId>org.apache.activemq</groupId>

<artifactId>activemq-spring</artifactId>

<version>5.10.0</version>

<type>xsd</type>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-jms</artifactId>

<version>4.1.1.RELEASE</version>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-tx</artifactId>

<version>4.1.1.RELEASE</version>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-orm</artifactId>

<version>4.1.1.RELEASE</version>

</dependency>

<dependency>

<groupId>c3p0</groupId>

<artifactId>c3p0</artifactId>

<version>0.9.1.2</version>

</dependency>

<dependency>

<groupId>org.hibernate.javax.persistence</groupId>

<artifactId>hibernate-jpa-2.0-api</artifactId>

<version>1.0.1.Final</version>

</dependency>

<dependency>

<groupId>net.rforge</groupId>

<artifactId>REngine</artifactId>

<version>0.6-8.1</version>

</dependency>

<dependency>

<groupId>net.rforge</groupId>

<artifactId>Rserve</artifactId>

<version>0.6-8.1</version>

</dependency>

<dependency>

<groupId>org.R</groupId>

<artifactId>RSession</artifactId>

<version>1.0</version>

</dependency>

</dependencies>

</project>

Hibernate DAO (mapping objects have been omitted for clarity, as I don't think they are causing the issue, as the exception is being thrown before any of them can be used):

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.springframework.dao.DataAccessException;

import boardwalk.computeServer.data.InterpolationDesiredPoint;

import boardwalk.computeServer.data.InterpolationJob;

public class DbDaoHibernateImpl implements DbDao {

private final SessionFactory sessionFactory;

public DbDaoHibernateImpl(SessionFactory sessionFactory){

// Save the session factory

this.sessionFactory = sessionFactory;

}

@Override

public InterpolationJob getInterpolationJob(int jobId) {

// Get the session

Session s = sessionFactory.getCurrentSession();

// Load the object from the database and return it

return (InterpolationJob) s.get(InterpolationJob.class, jobId);

}

}

Main class:

import org.apache.log4j.Logger;

import org.apache.xbean.spring.context.ClassPathXmlApplicationContext;

import org.springframework.transaction.annotation.Transactional;

import boardwalk.computeServer.dao.DbDao;

public class ComputeServer {

private static final Logger LOG = Logger.getLogger(ComputeServer.class);

/**

* Runs the server

* @param args none

*/

public static void main(String[] args) {

// Create the application context

@SuppressWarnings("resource")

ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring/beans.xml");

context.registerShutdownHook();

// Log the server start

LOG.info("Server has started");

test(context);

}

@Transactional

public static void test(ClassPathXmlApplicationContext context){

DbDao dao = (DbDao) context.getBean("dbDao");

System.err.println(dao.getInterpolationJob(1));

}

}

Spring configuration file:

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:context="http://www.springframework.org/schema/context"

xmlns:tx="http://www.springframework.org/schema/tx"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd

http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">

<!-- Load the properties file -->

<context:property-placeholder location="classpath:application.properties" />

<!-- C3PO pooled database connections -->

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"

destroy-method="close">

<property name="driverClass" value="${jdbc.driverClassName}" />

<property name="jdbcUrl" value="${jdbc.url}" />

<property name="user" value="${jdbc.username}" />

<property name="password" value="${jdbc.password}" />

<!-- These are C3P0 properties -->

<property name="acquireIncrement" value="1" />

<property name="minPoolSize" value="1" />

<property name="maxPoolSize" value="10" />

</bean>

<!-- Hibernate session factory -->

<bean id="hibernateSessionFactory"

class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">

<property name="dataSource" ref="dataSource" />

<property name="packagesToScan" value="boardwalk.computeServer.data" />

<property name="hibernateProperties">

<props>

<prop key="hibernate.dialect">${jdbc.dialect}</prop>

<prop key="hibernate.show_sql">true</prop>

</props>

</property>

</bean>

<!-- The database DAO -->

<bean id="dbDao" class="boardwalk.computeServer.dao.DbDaoHibernateImpl">

<constructor-arg ref="hibernateSessionFactory" />

</bean>

<!-- The transaction manager -->

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

<bean id="transactionManager"

class="org.springframework.orm.hibernate4.HibernateTransactionManager">

<property name="sessionFactory" ref="hibernateSessionFactory" />

</bean>

<context:annotation-config></context:annotation-config>

</beans>

I should note that the program runs fine when I substitute "getCurrentSession()" with "openSession()".

Thank you in advance!

网友答案:

@Transactional on the test() method is useless, it only works on spring managed bean. That is why there is no transaction context.

as @hiimjames said put @Transactional on your DAO class or method

网友答案:

Another way to do this is to run DAO tests with the following annotation: @RunWith(SpringJUnit4ClassRunner.class)

This way the @Transactional annotation will work. I would choose to avoid using transactions at the DAO level. The transaction is supposed to happend at the service.

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