为什么redis抛出NullPointerException通过使用spring和默认配置的JUnit运行？

Question

redis-server

下面是我的测试：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(loader=AnnotationConfigContextLoader.class)
public class RedisTest {
    @Configuration
    static class ContextConfiguration {


    }

    RedisTemplate<String, String> template;

    private JedisConnectionFactory getJedisConnectionFactory() {
        JedisConnectionFactory factory = new JedisConnectionFactory();
        factory.setHostName("localhost");
        factory.setPort(6379);
        factory.setUsePool(true);
        return factory;
    }

    private RedisTemplate<String, String> getRedisTemplate() {
        RedisTemplate<String, String> redisTemplate = new RedisTemplate<String, String>();
        redisTemplate.setConnectionFactory(getJedisConnectionFactory());
        return redisTemplate;
    }

    @Test
    public void testRedis() {
        System.out.println("testing redis ");

        template = getRedisTemplate();

        template.opsForValue().set("Key", "Value");
        String value = template.opsForValue().get("Key");
        System.out.println("got value : " + value);
    }
}

错误堆栈跟踪的顶部是

java.lang.NullPointerException
java.lang.NullPointerException
    at org.springframework.data.redis.core.AbstractOperations.rawValue(AbstractOperations.java:110)
    at org.springframework.data.redis.core.DefaultValueOperations.set(DefaultValueOperations.java:166)
    at com.mycompany.storage.RedisTest.testRedis(RedisTest.java:46)

Answer 1

问题是redisTemplate和jedisConnectionFactory都需要调用afterPropertiesSet（）。通常这是由Spring配置调用的，但由于这对我不起作用，所以必须显式地调用它。

还有，这些线

 factory.setHostName("localhost")
 factory.setPort(6379)
 factory.setUsePool(true)

是不必要的，因为它们是默认值。