Spring @Cacheable with SpEL键:始终计算为null [英] Spring @Cacheable with SpEL key: always evaluates to null

问题描述

我在使用@Cacheable并使用基于Spring表达式语言的自定义键时遇到问题.我有以下代码

I am having a problem with @Cacheable and using a custom key based on Spring expression language. I have the following code

@Cacheable(value = "myCache", key = "#providerDTO.identifier")
ClientVO loadClientVOByProviderDTO(ProviderDTO providerDTO);

这将引发以下错误

org.springframework.expression.spel.SpelEvaluation Exception: EL1007Epos 0): Field or property 'identifier' cannot be found on null

providerDTO参数不为null，我已多次验证.文档说这应该工作，所以我很困惑.文档给出了以下示例

The providerDTO argument is not null, I have verified this many times. The docs say that this should work so I am very confused. The docs give the following example

@Cacheable(value="books", key="#isbn.rawNumber")

我也尝试过使用静态方法.这将引发NullPointerException，因为在这里providerDTO为null.

I have also tried with a static method. This throws a NullPointerException because the providerDTO is null here.

public static String cacheKey(ProviderDTO providerDTO)                                                                                                                                                                                                                    
{                                                                                                                                                                                                                                                                         
    return providerDTO.identifier + "-" + providerDTO.clientID + "-" + providerDTO.clubID;                                                                                                                                                                            
}

我该如何调试以找出正在发生的情况?这是Spring 3.2.4-RELEASE. @Cacheable标记在接口上，但是据我所知，它仍然可以正常工作.

How can I debug this to find out what is happening? This is Spring 3.2.4-RELEASE. The @Cacheable tag is on an interface, but I am using standard spring AOP and not AspectJ so as far as I understand this should still work fine.

推荐答案

SpelEvaluationException:EL1007E:(pos 43):字段的可能重复项或无法在null上找到属性"group" 和 spring @Cacheable with Ehcache，请为有效对象找到null –我相信您在编译时没有调试信息.请检查您的Maven配置；您可能要在此处发布相关位.在您的POM(或父POM)中搜索maven-compiler-plugin和一行，例如:

Possible duplicate of SpelEvaluationException: EL1007E:(pos 43): Field or property 'group' cannot be found on null and spring @Cacheable with Ehcache, spel find null for valid object – I believe you compile without debug information. Please check your Maven configuration; you might want to post the relevant bits here. Search your POM (or parent POM) for the maven-compiler-plugin and a line such as:

<debug>false</debug>

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