Spring boot 注入时的问题

在搭建Spring Boot 框架时，遇到一个问题，系统包含多数据源，为了扩展
方便，每个数据源单独配置

@Order(1)
@MapperScan(basePackages = "com.zyxx.devplatform.test.dao.primary", sqlSessionFactoryRef = "primarySqlSessionFactory")
public class PrimaryDBConfig {

    @Bean
    @Primary
    @ConfigurationProperties(prefix = "datasource.primary")
......
    //事务管理器
    @Bean(name ="primaryTransactionManager")
    public DataSourceTransactionManager primaryTransactionManager() {
        return new DataSourceTransactionManager(primaryDataSource());
    }
......
}

打算使用AOP来管理事务

@Aspect
@Configuration
public class TransactionAspect {

    //数据源 primary 切点
    private static final String PRIMARY_AOP_POINTCUT_EXPRESSION = "execution(public * com.zyxx.devplatform.test.service.primary..*.*(..))";
    //数据源 secondary 切点
    private static final String SECONDARY_AOP_POINTCUT_EXPRESSION = "execution(public * com.zyxx.devplatform.test.service.secondary..*.*(..))";

    @Resource ApplicationContext applicationContext;
    @Resource(name="primaryTransactionManager")
    private PlatformTransactionManager primaryTransactionManager;
    @Resource (name="secondaryTransactionManager")
    private PlatformTransactionManager secondaryTransactionManager;

//    public TransactionAspect(PlatformTransactionManager primaryTransactionManager, PlatformTransactionManager secondaryTransactionManager) {
//        this.primaryTransactionManager = primaryTransactionManager;
//        this.secondaryTransactionManager = secondaryTransactionManager;
//    }

    @Bean
    public TransactionInterceptor txPrimaryAdvice() {
        //PlatformTransactionManager o = (PlatformTransactionManager)applicationContext.getBean("primaryTransactionManager");
        return  new TransactionInterceptor(primaryTransactionManager, createAdviceRule());
    }

    @Bean
    public TransactionInterceptor txSecondaryAdvice() {
        //PlatformTransactionManager o = (PlatformTransactionManager)applicationContext.getBean("secondaryTransactionManager");
        return  new TransactionInterceptor(secondaryTransactionManager, createAdviceRule());
    }

    @Bean
    public Advisor txPrimaryAdvisor() {
        AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();
        pointcut.setExpression(PRIMARY_AOP_POINTCUT_EXPRESSION);
        TransactionInterceptor txAdvice = txPrimaryAdvice();
        return new DefaultPointcutAdvisor(pointcut, txAdvice);
    }

    @Bean
    public Advisor txSecondaryAdvisor() {
        AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();
        pointcut.setExpression(SECONDARY_AOP_POINTCUT_EXPRESSION);
        TransactionInterceptor txAdvice = txSecondaryAdvice();
        return new DefaultPointcutAdvisor(pointcut, txAdvice);
    }
    @Bean
    NameMatchTransactionAttributeSource createAdviceRule(){
        // 事务管理规则，声明具备事务管理的方法名
        NameMatchTransactionAttributeSource source = new NameMatchTransactionAttributeSource();
        ......
        return source;
    }
}

然鹅，使用时，报异常

org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'org.springframework.transaction.PlatformTransactionManager' available: expected single matching bean but found 2: primaryTransactionManager,secondaryTransactionManager

调试后发现，secondaryTransactionManager在注入txSecondaryAdvice时
为null，primaryTransactionManager则大部分时间并无问题，偶尔似乎也为空。采用构造函数注入方式（参看注释掉的构造函数），或者使用applicationContext来获取Bean（参看txSecondaryAdvice），则没有问题，可以正常使用，是否有人知道这是为什么吗？

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