Question

我使用Spring-Data Neo4j 2.2.0-RELEASE。（我的以下问题将适用于任何其他类型的实体映射，为什么不适用于JPA）

在我的项目中，我有一个使用@Transactional Spring注释注释的公共方法，因为我想更新/保存其中的实体：

public class MeetingServices {

    private UserRepository userRepository;

    private MeetingRepository meetingRepository;

    public void setUserRepository(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    public void setMeetingRepository(MeetingRepository meetingRepository) {
        this.meetingRepository = meetingRepository;
    }

    @Transactional("neo4jTransactionManager")
    public void save(Meeting meeting) {
        User creator = userRepository.getUserByEmail("test@test.com");
        creator.participateIn(meeting); // this line leads to a NotInTransactionException since it signals that no transaction context is associated.
        meeting.setCreator(creator);
    }

我的application-context.xml如下：

<?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:neo4j="http://www.springframework.org/schema/data/neo4j"
       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/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/data/neo4j
       http://www.springframework.org/schema/data/neo4j/spring-neo4j.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <bean id="graphDatabaseService" class="org.neo4j.kernel.EmbeddedGraphDatabase">
        <constructor-arg value="target/neo4jgraph" />
    </bean>

    <neo4j:config graphDatabaseService="graphDatabaseService" />

    <bean id="meetingServices" class="services.MeetingServices">
        <property name="userRepository"><ref bean="userRepository"/></property>
        <property name="meetingRepository"><ref bean="meetingRepository"/></property>
    </bean>

    <bean id="userServices" class="services.UserServices">
        <property name="userRepository"><ref bean="userRepository"/></property>
    </bean>

    <bean id="neo4jTransactionManager"
        class="org.springframework.transaction.jta.JtaTransactionManager">
        <property name="transactionManager">
            <bean class="org.neo4j.kernel.impl.transaction.SpringTransactionManager">
                <constructor-arg ref="graphDatabaseService" />
            </bean>
        </property>
        <property name="userTransaction">
            <bean class="org.neo4j.kernel.impl.transaction.UserTransactionImpl">
                <constructor-arg ref="graphDatabaseService" />
            </bean>
        </property>
    </bean>

    <tx:annotation-driven mode="aspectj"
        transaction-manager="neo4jTransactionManager" />

    <!-- auto-generated repositories for Neo4j storage -->
    <neo4j:repositories base-package="repositories"/> 

    <context:spring-configured/>

    <context:annotation-config/>

</beans>

正如我们在此配置中看到的那样，aspectJ用于事务。

因此，我尝试通过更改application-context.xml以使用proxy功能而不是aspectJ功能来测试另一种方法：

<?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:neo4j="http://www.springframework.org/schema/data/neo4j"
       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/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/data/neo4j
       http://www.springframework.org/schema/data/neo4j/spring-neo4j.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <bean id="graphDatabaseService" class="org.neo4j.kernel.EmbeddedGraphDatabase">
        <constructor-arg value="target/neo4jgraph" />
    </bean>

    <neo4j:config graphDatabaseService="graphDatabaseService" />

    <bean id="meetingServices" class="services.MeetingServices">
        <property name="userRepository"><ref bean="userRepository"/></property>
        <property name="meetingRepository"><ref bean="meetingRepository"/></property>
    </bean>

    <bean id="userServices" class="services.UserServices">
        <property name="userRepository"><ref bean="userRepository"/></property>
    </bean>

    <tx:annotation-driven mode="proxy" />


    <neo4j:repositories base-package="repositories"/>

    <context:spring-configured/>

    <context:annotation-config/>

</beans>

此配置非常有效，因为@Transactional（其neo4jTransactionManager参数当然已删除）注释现在已考虑到我的服务方法。

我的问题是，（无论我的项目是否适用于简单的proxy方法）：

在我的第一个配置中使AspectJ交易功能失败的错误或配置错误是什么？

我目前正在使用Spring提高我的技术技能，并阅读了几篇关于aspectJ的“加载时编织”的文章。这可能与我的问题有关吗？

Answer 1

尝试添加<context:load-time-weaver/>以启用加载时间编织，并将spring-aspects.jar添加到类路径中。

有关详细信息，请参阅http://static.springsource.org/spring/docs/current/spring-framework-reference/html/aop.html#aop-aj-ltw-spring

修改

对于通用Java应用程序，即不在Web或应用程序容器中运行，您需要通过javaagent选项启用java instrumentatioin：

java -javaagent:path/to/spring-instrument.jar your.Main

如果要编织自己的方面，则需要提供带方面声明的META-INF / aop.xml文件。（对于仅有弹簧的方面而言，它并不是必需的，它已经在spring-aspect.jar上提供。）

最后，您可以使用编译时编织，例如using the maven aspectj plugin,：

<plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>aspectj-maven-plugin</artifactId> <configuration> <complianceLevel>1.6</complianceLevel> <aspectLibraries> <aspectLibrary> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> </aspectLibrary> </aspectLibraries> </configuration> <executions> <execution> <goals> <goal>compile</goal> </goals> </execution> </executions> </plugin>

使用AspectJ的Spring / @Transactional完全被忽略

1 个答案: