带有AspectJ的Spring / @Transactional被完全忽略

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，我有一个用@TransactionalSpring注释注释的公共方法，因为我想在其中更新/保存一个实体：

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("[e-mail]");
        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是以下内容：

<?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，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式：

<?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>

此配置效果很好，因为@Transactional（neo4jTransactionManager当然已删除了其参数）注释已考虑到我的服务的方法。

我的问题是（无论我的项目是否可以使用简单的proxy方法工作）：

我在第一个Spring的配置中错过了什么或配置错误，从而使AspectJ事务功能失败了？

我目前正在提高Spring的技术技能，并阅读了有关AspectJ的几篇有关“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/>以启用加载时编织，然后将spring-aspects.jar添加到类路径。

有关更多信息，请参见http://static.springsource.org/spring/docs/current/spring-
framework-reference/html/aop.html#aop-aj-ltw-
spring

编辑

对于一般的Java应用程序，即不在Web或应用程序容器中运行的应用程序，您需要通过javaagent选项启用Java工具：

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

如果要编织自己的方面，则需要提供带有方面声明的META-INF / aop.xml文件。（仅在spring方面不是必需的，已经在spring-
aspect.jar中提供了）。

最后，您可以使用Maven Aspectj插件代替编译时编织，例如：

<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>