It uses the method parameters provided to generate the key. If you have two methods that use the same cache name and the same set of parameter types, then there is a good chance that it will result in a collision. In such a scenario, either use different cache names for each method or provide different parameters. Custom KeyGenerator.
- Spring Cache Custom Key Generator 2017
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From the spring documentation :
How can I specify @Cachable to use isbn and checkWarehouse as key?
Update: Current Spring cache implementation uses all method parameters as the cache key if not specified otherwise. If you want to use selected keys, refer to Arjan’s answer which uses SpEL list {#isbn, #includeUsed} which is the simplest way to create unique keys.
From Spring Documentation
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The default key generation strategy changed with the release of Spring
4.0. Earlier versions of Spring used a key generation strategy that, for multiple key parameters, only considered the hashCode() of
parameters and not equals(); this could cause unexpected key
collisions (see SPR-10237 for background). The new
‘SimpleKeyGenerator’ uses a compound key for such scenarios.
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Spring Cache Custom Key Generator 2017
Before Spring 4.0
I suggest you to concat the values of the parameters in Spel expression with something like key='#checkWarehouse.toString() + #isbn.toString()'), I believe this should work as org.springframework.cache.interceptor.ExpressionEvaluator returns Object, which is later used as the key so you don’t have to provide an int in your SPEL expression.
As for the hash code with a high collision probability – you can’t use it as the key.
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Someone in this thread has suggested to use T(java.util.Objects).hash(#p0,#p1, #p2) but it WILL NOT WORK and this approach is easy to break, for example I’ve used the data from SPR-9377 :
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Both lines print -636517714 on my environment.
P.S. Actually in the reference documentation we have
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I think that this example is WRONG and misleading and should be removed from the documentation, as the keys should be unique.
P.P.S. also see https://jira.springsource.org/browse/SPR-9036 for some interesting ideas regarding the default key generation.
If keys are needed for automation (e.g., with, then they may be left without a passphrase. It may be advisable to also save the public key, though it can be later regenerated by loading the private key (by clicking Load).We strongly recommended using a passphrase be for private key files intended for interactive use. Generate ssh key linux openssl. Installing the public key as an authorized key on a serverWith both and servers, access to an account is granted by adding the public key to a file on the server.To install the public key, Log into the server, edit the authorizedkeys file with your favorite editor, and cut-and-paste the public key output by the above command to the authorizedkeys file.
I’d like to add for the sake of correctness and as an entertaining fact that using a secure cryptographic hash function like SHA256, due to the properties of such function IS possible for this task, but to compute it every time may be too expensive.
After some limited testing with Spring 3.2, it seems one can use a SpEL list: {., ., .}. This can also include null values. Spring passes the list as the key to the actual cache implementation. When using Ehcache, such will at some point invoke List#hashCode(), which takes all its items into account. (I am not sure if Ehcache only relies on the hash code.)
I use this for a shared cache, in which I include the method name in the key as well, which the Spring default key generator does not include. This way I can easily wipe the (single) cache, without (too much…) risking matching keys for different methods. Like:
Of course, if many methods need this and you’re always using all parameters for your key, then one can also define a custom key generator that includes the class and method name:
…with:
You can use a Spring-EL expression, for eg on JDK 1.7: Best ios and mac finance app.
Spring Cache Custom Key Generator Free
This will work
Cacheable Custom Key Generator
How to make dubstep on garageband mac 2018. @Cacheable(value=”bookCache”, key=”#checkwarehouse.toString().append(#isbn.toString())”)
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