最近在项目中(spring)集成 redis 时，在去工厂实例时，一直抱空指针 异常：
但是单元测试始终正常：

以下为 redis-config.xml 文件

 <context:property-placeholder location="classpath:properties/redis.properties" ignore-unresolvable="true"/>


    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxTotal" value="${redis.maxTotal}"/>
        <property name="maxIdle" value="${redis.maxIdle}"/>
        <property name="maxWaitMillis" value="${redis.maxWait}"/>
        <property name="testOnBorrow" value="${redis.testOnBorrow}"/>
    </bean>

    <!-- 单例模式 默认 -->
    <bean id="connectionFactory" class="redis.clients.jedis.JedisPool">
        <constructor-arg ref="jedisPoolConfig" name="poolConfig"/>
        <constructor-arg name="host" value="${redis.host}"/>
        <constructor-arg name="port" value="${redis.port}"/>
        <constructor-arg name="timeout" value="${redis.timeout}"/>
    </bean>

测试代码：

@Test
    public void redisTest(){
        Jedis jedis=jedisConnectionFactory.getResource();
        jedis.set("123","312312");
        System.out.println(jedis.get("123"));
    }
    

测试运行结果为：

312312

但是在 mybatis 中加入二级缓存抱错

  xxxMapper.xml
  ```xml
   <cache type="extra.cache.RedisCache"/>
   ```
  

二级缓存接口继承处理...

@Component
public class RedisCache implements Cache {

    private static final Logger logger= LoggerFactory.getLogger(RedisCache.class);

    @Autowired
    private JedisPool jedisConnectionFactory;


    private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock();

    private final String id;


    public RedisCache(final String id){
        if(id==null){
            throw new IllegalArgumentException("Cache instances require an ID");
        }
        logger.debug("MybatisRedisCache:id=" + id);
        this.id=id;
    }

    /**
     *  获取 id
     * @return
     */
    public String getId() {
        return this.id;
    }

    /**
     *  存储数据到 redis 数据库中
     * @param key
     * @param value
     */
    public void putObject(Object key, Object value) {

        logger.info("putObject :"+key+"= "+value);

        Jedis connection= jedisConnectionFactory.getResource();
        RedisSerializer<Object> serializer=new JdkSerializationRedisSerializer();
        connection.set(serializer.serialize(key),serializer.serialize(value));
        connection.close();

    }

    /**
     *  从 redis 中获取 数据
     * @param key
     * @return
     */
    public Object getObject(Object key) {
        logger.info("jedisConnectionFactory : "+jedisConnectionFactory);

        Jedis connection= jedisConnectionFactory.getResource();
        RedisSerializer<Object> serializer=new JdkSerializationRedisSerializer();
        Object result=serializer.deserialize(connection.get(serializer.serialize(key)));
        connection.close();
        return result;

    }

报的错误如下：打印日志说明为 空对象（JedisPool）

  INFO  extra.cache.RedisCache - jedisConnectionFactory : null

Error querying database.  Cause: java.lang.NullPointerException
### Cause: java.lang.NullPointerException

1. 初步怀疑为spring 加载顺序的问题，但是采用 SpringContextUtil.getBean("") ，依旧获取不了 该实例

   public class SpringContextUtil implements ApplicationContextAware{...}

2. 该项目采用多maven结构，同时子maven 打包时，存在一系列问题... 导致子模块之间没有通信