Spring @Autowired SessionFactory始终为null

时间：2016-02-16 16:15:22

标签： java spring hibernate

我刚刚使用spring + hibernate编写了一个简单的测试，但我在此测试中得到了一个空指针异常，因为sudo /etc/init.d/celerybeat stop + DEFAULT_PID_FILE=/var/run/celerybeat.pid + DEFAULT_LOG_FILE=/var/log/celerybeat.log + DEFAULT_LOG_LEVEL=INFO + DEFAULT_CELERYBEAT=celerybeat + test -f /etc/default/celeryd + . /etc/default/celeryd ++ CELERYD_NODES=w1 ++ CELERYD_OPTS='--time-limit=7200 -E' ++ CELERYD_CHDIR=/home/ubuntu/myexamplewebsite/mywebsite ++ CELERYD_MULTI='/home/ubuntu/myexamplewebsite/mywebsite/manage.py celeryd_multi' ++ CELERYD_LOG_FILE=/var/log/celery/%n.log ++ CELERYD_PID_FILE=/var/run/celery/%n.pid ++ CELERYD_USER=www-data ++ CELERYD_GROUP=www-data ++ CELERYBEAT_CHDIR=/home/ubuntu/myexamplewebsite/mywebsite ++ CELERYBEAT='/home/ubuntu/myexamplewebsite/mywebsite/manage.py celerybeat' ++ CELERYBEAT_OPTS='-S djcelery.schedulers.DatabaseScheduler' ++ CELERYBEAT_LOG_LEVEL=INFO ++ CELERYBEAT_USER=www-data ++ CELERYBEAT_GROUP=www-data ++ CELERYBEAT_LOG_FILE=/var/log/celery/beat.log ++ CELERYBEAT_PID_FILE=/var/run/celery/beat.pid ++ CELERYEV='/home/ubuntu/myexamplewebsite/mywebsite/manage.py celeryev' ++ CELERYEV_USER=www-data ++ CELERYEV_GROUP=www-data ++ CELERYEV_CAM=djcelery.snapshot.Camera ++ CELERYEV_LOG_FILE=/var/log/celery/evcam.log ++ CELERYEV_PID_FILE=/var/run/celery/evcam.pid + test -f /etc/default/celerybeat + CELERYBEAT='/home/ubuntu/myexamplewebsite/mywebsite/manage.py celerybeat' + CELERYBEAT_PID_FILE=/var/run/celery/beat.pid + CELERYBEAT_LOG_FILE=/var/log/celery/beat.log + CELERYBEAT_LOG_LEVEL=INFO + export CELERY_LOADER + CELERYBEAT_OPTS='-S djcelery.schedulers.DatabaseScheduler -f /var/log/celery/beat.log -l INFO' + '[' -n '' ']' ++ dirname /var/log/celery/beat.log + CELERYBEAT_LOG_DIR=/var/log/celery ++ dirname /var/run/celery/beat.pid + CELERYBEAT_PID_DIR=/var/run/celery + '[' '!' -d /var/log/celery ']' + '[' '!' -d /var/run/celery ']' + '[' -n www-data ']' + DAEMON_OPTS=' --uid www-data' + chown www-data /var/log/celery /var/run/celery + '[' -n www-data ']' + DAEMON_OPTS=' --uid www-data --gid www-data' + chgrp www-data /var/log/celery /var/run/celery + CELERYBEAT_CHDIR=/home/ubuntu/myexamplewebsite/mywebsite + '[' -n /home/ubuntu/myexamplewebsite/mywebsite ']' + DAEMON_OPTS=' --uid www-data --gid www-data --workdir /home/ubuntu/myexamplewebsite/mywebsite' + export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/sbin:/sbin + PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/sbin:/sbin + case "$1" in + check_paths ++ dirname /var/run/celery/beat.pid + ensure_dir /var/run/celery + '[' -d /var/run/celery ']' + mkdir -p /var/run/celery + chown www-data:www-data /var/run/celery + chmod 02755 /var/run/celery ++ dirname /var/log/celery/beat.log + ensure_dir /var/log/celery + '[' -d /var/log/celery ']' + mkdir -p /var/log/celery + chown www-data:www-data /var/log/celery + chmod 02755 /var/log/celery + stop_beat + echo -n 'Stopping celerybeat... ' Stopping celerybeat... + '[' -f /var/run/celery/beat.pid ']' ++ cat /var/run/celery/beat.pid + wait_pid 3691 + pid=3691 + forever=1 + i=0 + '[' 1 -gt 0 ']' + kill -0 3691 + '[' 0 -eq 1 ']' + kill -TERM 3691 + i=1 + '[' 1 -gt 60 ']' + sleep 0.5 + '[' 1 -gt 0 ']' + kill -0 3691 + '[' 1 -eq 1 ']' + echo OK OK + forever=0 + '[' 0 -gt 0 ']' + set +x sudo /etc/init.d/celerybeat start + DEFAULT_PID_FILE=/var/run/celerybeat.pid + DEFAULT_LOG_FILE=/var/log/celerybeat.log + DEFAULT_LOG_LEVEL=INFO + DEFAULT_CELERYBEAT=celerybeat + test -f /etc/default/celeryd + . /etc/default/celeryd ++ CELERYD_NODES=w1 ++ CELERYD_OPTS='--time-limit=7200 -E' ++ CELERYD_CHDIR=/home/ubuntu/myexamplewebsite/mywebsite ++ CELERYD_MULTI='/home/ubuntu/myexamplewebsite/mywebsite/manage.py celeryd_multi' ++ CELERYD_LOG_FILE=/var/log/celery/%n.log ++ CELERYD_PID_FILE=/var/run/celery/%n.pid ++ CELERYD_USER=www-data ++ CELERYD_GROUP=www-data ++ CELERYBEAT_CHDIR=/home/ubuntu/myexamplewebsite/mywebsite ++ CELERYBEAT='/home/ubuntu/myexamplewebsite/mywebsite/manage.py celerybeat' ++ CELERYBEAT_OPTS='-S djcelery.schedulers.DatabaseScheduler' ++ CELERYBEAT_LOG_LEVEL=INFO ++ CELERYBEAT_USER=www-data ++ CELERYBEAT_GROUP=www-data ++ CELERYBEAT_LOG_FILE=/var/log/celery/beat.log ++ CELERYBEAT_PID_FILE=/var/run/celery/beat.pid ++ CELERYEV='/home/ubuntu/myexamplewebsite/mywebsite/manage.py celeryev' ++ CELERYEV_USER=www-data ++ CELERYEV_GROUP=www-data ++ CELERYEV_CAM=djcelery.snapshot.Camera ++ CELERYEV_LOG_FILE=/var/log/celery/evcam.log ++ CELERYEV_PID_FILE=/var/run/celery/evcam.pid + test -f /etc/default/celerybeat + CELERYBEAT='/home/ubuntu/myexamplewebsite/mywebsite/manage.py celerybeat' + CELERYBEAT_PID_FILE=/var/run/celery/beat.pid + CELERYBEAT_LOG_FILE=/var/log/celery/beat.log + CELERYBEAT_LOG_LEVEL=INFO + export CELERY_LOADER + CELERYBEAT_OPTS='-S djcelery.schedulers.DatabaseScheduler -f /var/log/celery/beat.log -l INFO' + '[' -n '' ']' ++ dirname /var/log/celery/beat.log + CELERYBEAT_LOG_DIR=/var/log/celery ++ dirname /var/run/celery/beat.pid + CELERYBEAT_PID_DIR=/var/run/celery + '[' '!' -d /var/log/celery ']' + '[' '!' -d /var/run/celery ']' + '[' -n www-data ']' + DAEMON_OPTS=' --uid www-data' + chown www-data /var/log/celery /var/run/celery + '[' -n www-data ']' + DAEMON_OPTS=' --uid www-data --gid www-data' + chgrp www-data /var/log/celery /var/run/celery + CELERYBEAT_CHDIR=/home/ubuntu/myexamplewebsite/mywebsite + '[' -n /home/ubuntu/myexamplewebsite/mywebsite ']' + DAEMON_OPTS=' --uid www-data --gid www-data --workdir /home/ubuntu/myexamplewebsite/mywebsite' + export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/sbin:/sbin + PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/sbin:/sbin + case "$1" in + check_dev_null + '[' '!' -c /dev/null ']' + check_paths ++ dirname /var/run/celery/beat.pid + ensure_dir /var/run/celery + '[' -d /var/run/celery ']' + mkdir -p /var/run/celery + chown www-data:www-data /var/run/celery + chmod 02755 /var/run/celery ++ dirname /var/log/celery/beat.log + ensure_dir /var/log/celery + '[' -d /var/log/celery ']' + mkdir -p /var/log/celery + chown www-data:www-data /var/log/celery + chmod 02755 /var/log/celery + start_beat + echo 'Starting celerybeat...' Starting celerybeat... + '[' -n '' ']' + /home/ubuntu/myexamplewebsite/mywebsite/manage.py celerybeat -S djcelery.schedulers.DatabaseScheduler -f /var/log/celery/beat.log -l INFO --uid www-data --gid www-data -- --pidfile=/var/run/celery/beat.pid Overriding with Production settings... + set +x 始终为null。然后我尝试调用方法sessionFactory来获取getBean()。我发现它有效，但sessionFactory没有。为什么呢？

@autowired

感谢任何帮助;感谢。

以下是相关文件的内容：

这是我的private ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml"); protected SessionFactory sessionFactory=(SessionFactory)applicationContext.getBean("sessionFactory"); 

applicationContext.xml

这是我的测试<?xml version="1.0" encoding="UTF-8"?> <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:cache="http://www.springframework.org/schema/cache" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.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-4.0.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-4.0.xsd"> <!-- <bean id="..." class="..."> collaborators and configuration for this bean go here </bean> <bean id="..." class="..."> collaborators and configuration for this bean go here </bean> more bean definitions go here --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/desserthouse?autoReconnect=true" /> <property name="username" value="root" /> <property name="password" value="1234" /> </bean> <bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="packagesToScan" value="edu.nju.dessertHouse.model" /> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.hbm2ddl.auto">update</prop> <prop key="hibernate.connection.autocommit">true</prop> </props> </property> </bean> <bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean> <bean id="autowiredAnnotationBeanPostProcessor" class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" /> <context:component-scan base-package="edu.nju.dessertHouse" /> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="*User" propagation="REQUIRED" /> <tx:method name="*" propagation="NOT_SUPPORTED" read-only="true" /> </tx:attributes> </tx:advice> <aop:config> <aop:pointcut id="serviceOperation" expression="execution( * edu.nju.dessertHouse.service..*Service.*(..))" /> <aop:advisor advice-ref="txAdvice" pointcut-ref="serviceOperation" /> </aop:config> ：

MemberDaoImpl

}

为什么@Repository public class MemberDaoImpl implements MemberDao { @Autowired protected SessionFactory sessionFactory; protected Session session; protected static MemberDaoImpl memberDao=new MemberDaoImpl(); public Session getSession(){ return sessionFactory.openSession(); } @Override public void resigter(Member member) { try { session=getSession(); Transaction tx=session.beginTransaction(); session.save(member); tx.commit(); session.close(); sessionFactory.close(); System.out.println("ok"); } catch (Exception e) { e.printStackTrace(); } } public static void main(String[] args){ Member member=new Member(); member.setMemberid(1); member.setCreditCard("1"); member.setMemberCard("1"); member.setLocation("1"); member.setMname("1"); member.setPassword("1"); member.setSex("1"); member.setPoint(1); Calendar calendar=Calendar.getInstance(); calendar.set(Calendar.YEAR,1995); calendar.set(Calendar.MONTH,7-1); calendar.set(Calendar.DAY_OF_MONTH,6); Date date=new Date(calendar.getTimeInMillis()); member.setBirthday(date); memberDao.resigter(member); } 为空？我尝试了很多方法，但它仍然无法正常工作。

1 个答案:

答案 0 :(得分：0)

您正在通过以下方式创建MemberDAOImpl的新实例：

protected static MemberDaoImpl memberDao=new MemberDaoImpl();

然后，您通过执行register()在此新实例上调用memberDao.resigter(member);。

您认为Spring Framework如何运作？

您不应该创建MemberDAOImpl的新实例而只是register(member);而不是memberDao.resigter(member);，因为您已经通过{{1}注释它来创建单个MemberDAOImpl }}。这注入了@Repository Bean。

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