Caching in Spring on methods with array parameters

Question

I have a service with multiple methods and am attempting to cache them using Spring `@Cacheable` annotations. Everything works fine except I've found the methods with an array as a method parameter are not cached. This somewhat makes sense considering arrays can hold different values, but I would still think it would be possible. The following methods are cached: ``` @Cacheable("myCache") public Collection findBuildingByCode(String buildingCode) {...} @Cacheable("myCache") public Collection getBuildings() {...} ``` However, if I change the `findBuildingByCode` method to either of the following, it is not cached: ``` @Cacheable("myCache") public Collection findBuildingByCode(String[] buildingCode) {...} @Cacheable("myCache") public Collection findBuildingByCode(String... buildingCode) {...} ``` Here is the relevant Spring xml configuration: ```

Accepted Answer

Try to define the cache key like that:

```
@Cacheable(value="myCache", key="#buildingCode.toString()")
```

Or `#buildingCode.hashCode()`. So the cache manager will be able to cache the method.

Caching in Spring on methods with array parameters

Solution

Problem