我正在用spring和JPA构建一个应用程序。我的读取功能正在运行但是当我尝试保存任何对象时，我得到异常没有可用的事务性EntityManager 。
这是我的web.xml文件：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<!-- The definition of the Root Spring Container shared by all Servlets
and Filters -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/root-context.xml,/WEB-INF/spring/webservices-context.xml,/WEB-INF/spring/security-context.xml</param-value>
</context-param>
<!-- Creates the Spring Container shared by all Servlets and Filters -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<mime-mapping>
<extension>js</extension>
<mime-type>application/x-javascript</mime-type>
</mime-mapping>
<mime-mapping>
<extension>properties</extension>
<mime-type>application/text</mime-type>
</mime-mapping>
<!-- Processes application requests -->
<servlet>
<servlet-name>appServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>appServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
这是我的spring / appServlet / servlet-context.xml：
<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->
<!-- Enables the Spring MVC @Controller programming model -->
<annotation-driven />
<beans:bean id="placeholderConfig" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<beans:property name="location" value="classpath:resources.properties"></beans:property>
</beans:bean>
<!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
<resources mapping="/**" location="${resources.base}, ${resources.modules}, ${resources.lib}, ${resources.apps}" /> <!-- resource mapp for extjs and Designer to / -->
<resources mapping="/resources/**" location="${resources.resources}" />
<!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
<beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<beans:property name="prefix" value="/WEB-INF/views/" />
<beans:property name="suffix" value=".jsp" />
</beans:bean>
<context:component-scan base-package="com.app.webapp" />
</beans:beans>
这是我的spring / root-context.xml：
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!-- Root Context: defines shared resources visible to all other web components -->
<context:annotation-config />
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp" />
</bean>
<bean id="appDS"
class="org.springframework.jdbc.datasource.DriverManagerDataSource"
p:driverClassName="com.mysql.jdbc.Driver" p:url="jdbc:mysql://localhost/schema1"
p:username="user1" p:password="741147">
</bean>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="appDS" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
<bean id="persistenceExceptionTranslationPostProcessor"
class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />
<context:spring-configured />
<context:annotation-config />
</beans>
这是我的persistence.xml：
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" 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">
<persistence-unit name="myPU" transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
<property name="hibernate.transaction.auto_close_session" value="false"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.format_sql" value="false"/>
<property name="hibernate.generate_statistics" value="false"/>
<property name="hibernate.connection.autocommit" value="true"/>
<!-- <property name="hibernate.hbm2ddl.auto" value="update"/> -->
<property name="hibernate.query.jpaql_strict_compliance" value="false"/>
<property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.SunOneJtaPlatform" />
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
</properties>
</persistence-unit>
</persistence>
这是我的DaoImpl.java：
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import com.app.webapp.data.dao.impl.GenericDaoImpl;
import com.app.webapp.data.dao.interfaces.security.IUserDao;
import com.app.webapp.data.domains.entities.Account;
import com.app.webapp.data.domains.entities.security.AccessPrivilege;
import com.app.webapp.data.domains.entities.security.ActiveSession;
import com.app.webapp.data.domains.entities.security.Process;
import com.app.webapp.data.domains.entities.security.Profile;
import com.app.webapp.data.domains.entities.security.User;
import com.app.webapp.data.exceptions.DuplicatedUserException;
import com.app.webapp.data.exceptions.UserAlreadyHasAnAccountException;
import com.app.webapp.data.exceptions.UserNotFoundException;
@Repository("userDao")
@Transactional
public class UserDaoImpl implements IUserDao {
@PersistenceContext(unitName = "myPU")
protected EntityManager entityManager;
public UserDaoImpl() {
super(User.class);
}
@Override
@Transactional(readOnly = false, propagation = Propagation.REQUIRES_NEW)
public void save(User user) throws DuplicatedUserException {
logger.info("Creating User with username: " + user.getUsername());
User foundUser = null;
logger.info("Checking if user already existis...");
entityManager.persist(user);
logger.info("User " + user.getUsername() + " was been saved with success!");
}
}
然后执行持久用户的行，我得到了例外：
javax.persistence.TransactionRequiredException：没有可用的事务性EntityManager
但我无法理解为什么我可以从db获取数据，但我无法写。我不知道servlet上下文中是否有任何内容，并且不与其他上下文共享。有人可以帮帮我吗？
答案 0 :(得分：1)
您是否在@Transactional或服务层类中提供了@Service注释？如果是，请检查您的hibernet/entityManager.jar版本兼容性。