RedisSetCommands.isMember(K key, Object... objects) throws ClassCastException

[ghost]

• I use Java 17 , Redis Cluster version 7.0.10 and spring-data-redis 3.1.2
• With the code that checks if a list of values ​​is in a set:

var member = stringRedisTemplate.opsForSet().isMember("Blacklist[115]", "eeq7OACuw81wCrxqPICIWg==", "test2");

• I get this error:

java.lang.ClassCastException: class java.lang.Long cannot be cast to class java.lang.Boolean (java.lang.Long and java.lang.Boolean are in module java.base of loader 'bootstrap')

	at org.springframework.data.redis.core.DefaultSetOperations.lambda$isMember$10(DefaultSetOperations.java:169)
	at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:406)
	at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:373)
	at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:97)
	at org.springframework.data.redis.core.DefaultSetOperations.isMember(DefaultSetOperations.java:158)
	at com.elcom.ads.contactcacher.ContactCacherApplicationTests.contextLoads(ContactCacherApplicationTests.java:45)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)

• I reading source code and see error in line isMember.put(objects[i], result.get(i));

        // in class src/main/java/org/springframework/data/redis/core/DefaultSetOperations.java
	@Override
	public Map<Object, Boolean> isMember(K key, Object... objects) {

		byte[] rawKey = rawKey(key);
		byte[][] rawValues = rawValues(objects);

		return execute(connection -> {

			List<Boolean> result = connection.sMIsMember(rawKey, rawValues);

			if (result == null || result.size() != objects.length) {
				return null;
			}

			Map<Object, Boolean> isMember = new LinkedHashMap<>(result.size());

			for (int i = 0; i < objects.length; i++) {
				isMember.put(objects[i], result.get(i)); 
			}

			return isMember;
		});
	}

[jxblum]

Could you please create a simple test case reproducing the issue?

Spring Data Redis already contains a test case for [Default]SetOperations.isMember(key, Object...) method; see here. This individual test case method tests for many different combinations of Redis driver [ Jedis, Lettuce ] combined with different types for keys and values; see here.

The difference between Redis standalone and cluster should not matter in this case.

I distilled this down into a more directed test case matching your setup; see here.

All tests pass with Jedis and Lettuce in Spring Data Redis 3.1.2 as well as in the latest 3.1 release: 3.1.5.

You cannot simply assume the result.get(i) invocation returns an numerical value simply because the Redis SMISMEMBER command (doc) returns 1 if the value is a member of the targeted set and 0 if not.

You have to consider the return value from the underlying Redis driver API (Jedis or Lettuce) used to invoke the set member command.

In the case of Jedis, Spring Data Redis calls Jedis::smismember, which is documented to return a List<Boolean>.

Even if you are indirectly calling the SD Redis JedisClusterSetCommands.sMIsMember(..) method, this in turn invokes the Jedis drivers JedisCluster.smismember(..) method, which again returns a List<Boolean>; see here.

In the case of Lettuce, Spring Data Redis simply calls Lettuce's RedisSetAsyncommands::smismember, which, of course, returns a List<Boolean> as documented.

NOTE: The RedisFuture<List<Boolean>> is properly handled and unwrapped by Spring Data Redis itself as a synchronous operations (i.e. waiting on the Future).

I wonder if you possibly altered your configuration in a non-prescribed, incompatible manner?

[JohnZYP]

@thanbv1510 Please check if the Redisson dependency has been added. Remove it to resolve the issue, or alternatively, use Redisson's native API.

[ghost]

Yes, I using redisson with spring-data-redis, code correct if I remove redisson dependency

[jxblum]

I can possibly see how Redisson might have caused this ClassCastException being on your Spring (Data) application classpath, particularly if it somehow involved (used) the referenced RedisCommand<List<Long>> object.

Of course, this was not apparent from the provided Stack Trace above.

In general, Spring Data Redis does not integrate with any other library, such as Redisson, only other Spring libs (e.g. Spring Data Commons, the core Spring Framework, etc) and the Redis drivers (Jedis and Lettuce) directly.

In particular, all integration of Redisson with Spring is handled by the Redisson project itself; see Features, toward the bottom of the list.

I will be closing this ticket as invalid for now.

[mrniko]

Fixed in redisson/redisson#6209