Re: What is the cause of this NullPointer Exception? (Spring Data)

[Colin Vipurs]

I don't know anything about Spring data - but we've hit issues before because Jedis doesn't like you trying to send nulls.

I can't see it from your code, but do you have a null field you're trying to persist?

On Sun, Aug 18, 2013 at 7:50 PM, <appren...@googlemail.com> wrote:

Hi,

Can somebody please take a glance at this Null Pointer Exception and comment why I'm getting the this Exception? (excerpts of referenced classes/xml included).

Thanks in advance.

Exception in thread "main" org.springframework.data.redis.RedisSystemException: Unknown jedis exception; nested exception is java.lang.NullPointerException
    at org.springframework.data.redis.connection.jedis.JedisConnection.convertJedisAccessException(JedisConnection.java:141)
    at org.springframework.data.redis.connection.jedis.JedisConnection.set(JedisConnection.java:897)
    at org.springframework.data.redis.connection.DefaultStringRedisConnection.set(DefaultStringRedisConnection.java:384)
    at org.springframework.data.redis.core.DefaultValueOperations$9.inRedis(DefaultValueOperations.java:178)
    at org.springframework.data.redis.core.AbstractOperations$ValueDeserializingRedisCallback.doInRedis(AbstractOperations.java:49)
    at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:169)
    at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:137)
    at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:84)
    at org.springframework.data.redis.core.DefaultValueOperations.set(DefaultValueOperations.java:175)
    at com.equitytwits.core.redis.repository.UserRepository.addAuth(UserRepository.java:63)
    at com.equitytwits.core.redis.repository.UserRepository.addUser(UserRepository.java:55)
    at com.equitytwits.core.redis.CreateNewUser.main(CreateNewUser.java:22)
Caused by: java.lang.NullPointerException
    at redis.clients.jedis.Protocol.sendCommand(Protocol.java:48)
    at redis.clients.jedis.Protocol.sendCommand(Protocol.java:33)
    at redis.clients.jedis.Connection.sendCommand(Connection.java:80)
    at redis.clients.jedis.BinaryClient.set(BinaryClient.java:86)
    at redis.clients.jedis.BinaryJedis.set(BinaryJedis.java:59)
    at org.springframework.data.redis.connection.jedis.JedisConnection.set(JedisConnection.java:895)
    ... 10 more

//Tester Class
public class CreateNewUser {
    private static Logger logger = Logger.getLogger(CreateUserTester.class);
    public static void main(String[] args) {
        GenericXmlApplicationContext ctx = new GenericXmlApplicationContext();
        ctx.load("redis-app-context.xml");
        ctx.refresh();
    UserRepository userRepo = ctx.getBean("redisUserRepository", UserRepository.class);
    User user = new User();
    ...
    userRepo.addUser(user);
   
    }
   

//Repository Class

@Named
public class UserRepository {
    private static Logger logger = LoggerFactory.getLogger(UserRepository.class);   
    private StringRedisTemplate redisTemplate;
    private ValueOperations<String, String> valueOps;
    private RedisList<String> users;
    private ListOperations<String, String> listOps;
    private RedisAtomicLong userIdCounter;
   
    @Autowired
    public UserRepository(StringRedisTemplate redisTemplate){
        this.redisTemplate = redisTemplate;
        this.valueOps = redisTemplate.opsForValue();
        users = new DefaultRedisList<String>(KeyUtils.users(), redisTemplate);
        userIdCounter = new RedisAtomicLong(KeyUtils.globalUid(), redisTemplate.getConnectionFactory());
    }

.....

}


//Context File
<bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
p:host-name="${redis.host}" p:port="${redis.port}" p:password="${redis.pass}"/>

<bean id="redisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate"
p:connection-factory-ref="jedisConnectionFactory"/>

Maven Dependency version
<spring-data-redis-version>1.0.6.RELEASE</spring-data-redis-version>

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