@Aspect class getting null EntityManagerFactory

[mail.supratim@gmail.com]

Hi all, I have declared an aspect like the following.

@Aspect
public class CacheMonitorImpl {
    private final static Logger LOG = LoggerFactory
            .getLogger(CacheMonitorImpl.class);

    private final static NumberFormat NF = new DecimalFormat("0.0###");

    @Autowired
    private EntityManagerFactory entityManagerFactory;

    @Around("execution(* aop.web.teacher.service..*.*(..))")
    public Object log(ProceedingJoinPoint pjp) throws Throwable {

        LOG.info("$$ Test Property :: " + testprop);

        if (!LOG.isDebugEnabled()) {
            LOG.info("####### Logger is not debug enabled"
                    + entityManagerFactory);
            return pjp.proceed();
        }

        HibernateEntityManagerFactory hbmanagerfactory = (HibernateEntityManagerFactory) entityManagerFactory;
        SessionFactory sessionFactory = hbmanagerfactory.getSessionFactory();

        Statistics statistics = sessionFactory.getStatistics();
        statistics.setStatisticsEnabled(true);

        long hit0 = statistics.getQueryCacheHitCount();
        long miss0 = statistics.getSecondLevelCacheMissCount();

        Object result = pjp.proceed();

        long hit1 = statistics.getQueryCacheHitCount();
        long miss1 = statistics.getQueryCacheMissCount();

        double ratio = (double) hit1 / (hit1 + miss1);

        if (hit1 > hit0) {
            LOG.debug(String.format("CACHE HIT; Ratio=%s; Signature=%s#%s()",
                    NF.format(ratio), pjp.getTarget().getClass().getName(), pjp
                            .getSignature().toShortString()));
        } else if (miss1 > miss0) {
            LOG.debug(String.format("CACHE MISS; Ratio=%s; Signature=%s#%s()",
                    NF.format(ratio), pjp.getTarget().getClass().getName(), pjp
                            .getSignature().toShortString()));
        } else {
            LOG.debug("query cache not used");
        }

        return null;
    }

}

My EntityManagerFactory is wired as the following

	<tx:annotation-driven transaction-manager="transactionManager" />

	<context:component-scan base-package="aop.web.teacher.rdaos" />




			<bean id="pgDS" class="com.mchange.v2.c3p0.ComboPooledDataSource"
				destroy-method="close" p:driverClass="org.postgresql.Driver"
				p:jdbcUrl="${jdbc.url}" p:user="${jdbc.username}" p:password="${jdbc.password}"
				p:minPoolSize="2" p:acquireIncrement="1" p:maxPoolSize="20" />

			<bean id="dataSource"
				class="org.springframework.jdbc.datasource.DriverManagerDataSource"
				p:driverClassName="${jdbc.driverClassName}" p:url="${jdbc.url}"
				p:username="${jdbc.username}" p:password="${jdbc.password}" />

			<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"
				p:entityManagerFactory-ref="entityManagerFactory" />

			<bean id="entityManagerFactory"
				class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
				p:dataSource-ref="pgDS" p:jpaVendorAdapter-ref="jpaAdapter">
				<property name="loadTimeWeaver">
					<bean
						class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver" />
				</property>
				<property name="persistenceUnitName" value="wctemplatePU"></property>
			</bean>

			<bean id="jpaAdapter"
				class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />

The aspect executes fine but with null EntityManagerFactory .
Where am I going wrong?

[jzcfk9]

Since you're using JPA and Spring is managing the EntityManager, why not just use @PersistenceContext, as such:

@Aspect
public class CacheMonitorImpl {
    @PersistenceContext
    private EntityManager em;
}

If you think you really need access the the EntityManagerFactory, then you could do this:

@Aspect
public class CacheMonitorImpl {
    private EntityManagerFactory emf;

    @PersistenceUnit
    public void setEntityManagerFactory(EntityManagerFactory emf) {
        this.emf = emf;
    }
}

Read the Spring Reference guide for further details on implementing DAOs using JPA.

[J Rawlings]

Hi, did you manage to get this working? I have tried ising the @PersistenceContext and @Autowired, both result in null entity manager. Any advice would be great.

Thanks.