ehcache：Null key returned for cache operation问题解决方法

前言

今天一个上线许久的系统突然无法新增证书，但是不是所有都不允许新增，只是编号重复的无法新增。从逻辑上想，我是设置了编号重复判断，但是该业务判断逻辑未生效，从缓存上将，会不会是id=null导致的问题。

报错详情：

java.lang.IllegalArgumentException: Null key returned for cache operation (maybe you are using named params on classes without debug info?) Builder[public java.lang.Object com.egag.cert.controller.CertCompanyController.save(com.egag.cert.entity.CertCompany)] caches=[cache-certCompany] | key='#certCompany.certId' | keyGenerator='' | cacheManager='' | cacheResolver='' | condition='',false,false
        at org.springframework.cache.interceptor.CacheAspectSupport.generateKey(CacheAspectSupport.java:578)
        at org.springframework.cache.interceptor.CacheAspectSupport.performCacheEvict(CacheAspectSupport.java:492)
        at org.springframework.cache.interceptor.CacheAspectSupport.processCacheEvicts(CacheAspectSupport.java:476)
        at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:433)

        at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:345)

        at org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:61)

检查思路

报错信息非常清晰，首先是缓存报错，另一方面是发生在新增的情况（id = null / 0） 且编号重复的情况，编辑旧的数据则不会影响。

public class EhCacheUtil {
    
    

    public static final String CACHE_NAME_CERT_COMPANY="cache-certCompany";
    public static final String CACHE_NAME_CERT_COMPANY_LIST="cache-certCompanyList";
    public static final String CACHE_KEY_CERT_COMPANY_OBJ="#certCompany.certId";
    public static final String CACHE_KEY_CERT_COMPANY_ID="#id";
	//省略其他
}

思来想去莫非是新增的对象在缓存中判断不严谨，因为我们重点在于更新旧的数据，新的数据查询的时候自己加载到缓存就可以了。于是我们需要增加一个condition的参数。

   /**
     * 新增或编辑
     */
    @PostMapping("/save")
    @CacheEvict(value = EhCacheUtil.CACHE_NAME_CERT_COMPANY, key = EhCacheUtil.CACHE_KEY_CERT_COMPANY_OBJ)
    public Object save(@RequestBody CertCompany certCompany){
    
    
        log.info("certCompany:"+JSON.toJSONString(certCompany));
        CertCompany oldCertCompany = certCompanyMapper.selectOne(new QueryWrapper<CertCompany>().eq("cert_id",certCompany.getCertId()));
        certCompany.setUpdateTime(new Date());
        if(oldCertCompany!=null){
    
    
            certCompanyMapper.updateById(certCompany);
        }else{
    
    
            if(certCompanyMapper.selectOne(new QueryWrapper<CertCompany>().eq("cert_number",certCompany.getCertNumber()))!=null){
    
    
                return ReturnT.ERROR("保存失败，名字重复");
            }
            //创建MiniCode
            certCompanyMapper.insert(certCompany);
        }
        //省略部分业务逻辑
        //清空列表缓存
        cacheService.cleanCompanyListByPageLimit();
        return ReturnT.SUCCESS("保存成功");
    }

解决方案

public class EhCacheUtil {
    
    

    public static final String CACHE_NAME_CERT_COMPANY="cache-certCompany";
    public static final String CACHE_NAME_CERT_COMPANY_LIST="cache-certCompanyList";
    public static final String CACHE_KEY_CERT_COMPANY_OBJ="#certCompany.certId";
    //zhengkai.blog.csdn.net 新增以解决Null key returned for cache operation问题
    public static final String CACHE_KEY_CERT_COMPANY_OBJ_NOTNULL="#certCompany.certId !=null ";
    public static final String CACHE_KEY_CERT_COMPANY_ID="#id";
	//省略其他
}

   /**
     * 新增或编辑
     */
    @PostMapping("/save")
    @CacheEvict(value = EhCacheUtil.CACHE_NAME_CERT_COMPANY, key = EhCacheUtil.CACHE_KEY_CERT_COMPANY_OBJ,condition = EhCacheUtil.CACHE_KEY_CERT_COMPANY_OBJ_NOTNULL)
    public Object save(@RequestBody CertCompany certCompany){
    
    
        //省略业务逻辑
    }