spring redis wrong result - spring

Question

I am using Spring Redis with the #Cacheable annotiation for two methods. When I call one method I am getting a result cached for the other method.
How can it happen that I get the result from the wrong cache while I configured a different cache for each method using the #Cachebale annotation?
Setup: Spring Version 4.1.6. Redis data 1.5 and Redis client 2.7.0.
Example code:
#Cacheable("test1")
public List<String> findSgsns() {
}
#Cacheable("test2")
public List<String> findSgsns2() {
}

Answer 1

The problem was sloved by adding following setting to spring configuration (set usePrefix):
<bean
id="cacheManager"
class="org.springframework.data.redis.cache.RedisCacheManager"
c:template-ref="redisTemplate">
<property name="usePrefix" value="true" />
</bean>

Answer 2

By default, Spring use SimpleKeyGenerator to generate the key if you don't specify it in the #Cacheable annotation.
public class SimpleKeyGenerator implements KeyGenerator {
#Override
public Object generate(Object target, Method method, Object... params)
{
return generateKey(params);
}
/**
* Generate a key based on the specified parameters.
*/
public static Object generateKey(Object... params) {
if (params.length == 0) {
return SimpleKey.EMPTY;
}
if (params.length == 1) {
Object param = params[0];
if (param != null && !param.getClass().isArray()) {
return param;
}
}
return new SimpleKey(params);
}
}
As there is no method arguments in both of your methods (findSgsns() and findSgsns2()), it essentially will generate the same cache key for both methods.
You've already found a solution which basically utilize usePrefix property in the redisTemplate bean, which essentially add you value ( namely, "test1" and "test2") you specified in your #Cacheable annotation when it forms the cache key in Redis. I would like to mention 2 more alternatives for the sake of completeness here:
Specify your own key for each method (Note: you can use Spring EL to specify your keys):
#Cacheable(value = "test1", key = "key1")
public List<String> findSgsns() {
}
#Cacheable(value = "test2", key = "key2")
public List<String> findSgsns2() {
}
Build a custom key generator, and below is sample key generator which takes method name into redis cache key generation (Note: the custom key generator will take effect automatically by extending CachingConfigurerSupport class):
#Configuration
public class RedisConfig extends CachingConfigurerSupport {
#Bean
public KeyGenerator keyGenerator() {
return new KeyGenerator() {
#Override
public Object generate(Object target, Method method, Object... params) {
StringBuilder sb = new StringBuilder();
sb.append(target.getClass().getName());
sb.append(method.getName());
for (Object obj : params) {
sb.append(obj.toString());
}
return sb.toString();
}
};
}
}