[英]Hibernate Spring JPA javax.persistence.TransactionRequiredException: No transactional EntityManager available
[英]Request processing failed; nested exception is javax.persistence.TransactionRequiredException: No transactional EntityManager available
當我嘗試保留對象時發生異常。
import org.springframework.transaction.annotation.Transactional;
@Repository("DBRepository")
@Transactional
public class DBRepository implements Repository {
@PersistenceContext
private EntityManager entityManager;
@Override
public void addElement(Element element) {
logger.debug("Element {} is going to be added to database", element);
entityManager.persist(element);
}
}
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="p_unit" transaction-type="RESOURCE_LOCAL"/>
</persistence>
web.xml
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/config/jpa-config.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
jpa-config.xml
<?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:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="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-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
<!-- Using annotation to configure application -->
<context:annotation-config/>
<context:component-scan base-package="web.tmh"/>
<!-- Tells Spring to use persistence context annotation -->
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"/>
<tx:annotation-driven mode="proxy" transaction-manager="transactionManager"/>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="p_unit"/>
<property name="dataSource" ref="dataSource"/>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="true"/>
</bean>
</property>
<property name="jpaPropertyMap">
<map>
<entry key="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect"/>
<entry key="hibernate.hbm2ddl.auto" value="update"/>
</map>
</property>
</bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<!-- autoReconnect=true param allows our application to reconnect to base if connection was lost -->
<property name="url" value="jdbc:mysql://localhost:3306/TellMeHow?autoReconnect=true"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</bean>
</beans>
因此,您可以看到我使用了正確的Transactional批注,並且在jpa-config.xml中具有<tx:annotation-driven mode="proxy" transaction-manager="transactionManager"/>
。 所以我真的不明白為什么它不想要工作
好的,問題解決了。 我在dispatcher-config.xml
犯了一個小錯誤:
所以代替
<mvc:annotation-driven/>
<context:component-scan base-package="web.tmh"/>
我不得不寫
<mvc:annotation-driven/>
<context:component-scan base-package="web.tmh.controller"/>
我以為component-scan
遞歸地工作,但似乎沒有...
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