本篇文章为你整理了spring @Cacheable使用SpEL异常:org.springframework.expression.spel.SpelParseException: Unexpected token. Expected 'identifier' but was 'lcurly({)'()的详细内容,包含有 spring @Cacheable使用SpEL异常:org.springframework.expression.spel.SpelParseException: Unexpected token. Expected 'identifier' but was 'lcurly({)',希望能帮助你了解 spring @Cacheable使用SpEL异常:org.springframework.expression.spel.SpelParseException: Unexpected token. Expected 'identifier' but was 'lcurly({)'。
@Cacheable(cacheNames = ENTERPRISE_CACHE_KEY, key = "#{T(com.emax.common.RestApiSignUtil).foo(#root.args[0])}")
异常:
org.springframework.expression.spel.SpelParseException: Expression [#{T(com.emax.common.RestApiSignUtil).foo(#root.args[0])}] @1: EL1043E: Unexpected token. Expected identifier but was lcurly({)
异常stacktrace信息:
org.springframework.expression.spel.SpelParseException: Expression [#{T(com.emax.common.RestApiSignUtil).foo(#root.args[0])}] @1: EL1043E: Unexpected token. Expected identifier but was lcurly({)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.internalException(InternalSpelExpressionParser.java:1044)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatToken(InternalSpelExpressionParser.java:926)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.maybeEatFunctionOrVar(InternalSpelExpressionParser.java:423)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatStartNode(InternalSpelExpressionParser.java:512)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatPrimaryExpression(InternalSpelExpressionParser.java:351)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatUnaryExpression(InternalSpelExpressionParser.java:345)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatPowerIncDecExpression(InternalSpelExpressionParser.java:304)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatProductExpression(InternalSpelExpressionParser.java:282)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatSumExpression(InternalSpelExpressionParser.java:264)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatRelationalExpression(InternalSpelExpressionParser.java:218)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatLogicalAndExpression(InternalSpelExpressionParser.java:205)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatLogicalOrExpression(InternalSpelExpressionParser.java:192)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatExpression(InternalSpelExpressionParser.java:153)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.doParseExpression(InternalSpelExpressionParser.java:131)
at org.springframework.expression.spel.standard.SpelExpressionParser.doParseExpression(SpelExpressionParser.java:61)
at org.springframework.expression.spel.standard.SpelExpressionParser.doParseExpression(SpelExpressionParser.java:33)
at org.springframework.expression.common.TemplateAwareExpressionParser.parseExpression(TemplateAwareExpressionParser.java:52)
at org.springframework.expression.common.TemplateAwareExpressionParser.parseExpression(TemplateAwareExpressionParser.java:43)
at org.springframework.context.expression.CachedExpressionEvaluator.getExpression(CachedExpressionEvaluator.java:88)
at org.springframework.cache.interceptor.CacheOperationExpressionEvaluator.key(CacheOperationExpressionEvaluator.java:104)
at org.springframework.cache.interceptor.CacheAspectSupport$CacheOperationContext.generateKey(CacheAspectSupport.java:778)
at org.springframework.cache.interceptor.CacheAspectSupport.generateKey(CacheAspectSupport.java:575)
at org.springframework.cache.interceptor.CacheAspectSupport.findCachedItem(CacheAspectSupport.java:518)
at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:401)
at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:345)
at org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:61)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
at com.emax.MyService$$EnhancerBySpringCGLIB$$4de73e25.getEnterpriseByEntId( generated )
at com.emax.MyServiceTest.getEnterpriseByEntId(MyServiceTest.java:21)
View Code
identifier、lcurly都是什么?一脸懵逼。
顺着stacktrace点进去看源码,才确定lcurly表示左大括号“{”。看来不能用“{”。下面是正确答案:
@Cacheable(cacheNames = ENTERPRISE_CACHE_KEY, key = "T(com.emax.common.RestApiSignUtil).foo(#root.args[0])")
在SpEL中可以调用类的方法,足见SpEL的强大!
扩展:@Cacheable中SpEL的用法列举
// 下面方式可以同时设置两个缓存; 取参数可以用#param形式
@Cacheable(cacheNames = {ENTERPRISE_CACHE_KEY, "test-another-key"}, key = "#enterpriseId eq 0 ? 0: #enterpriseId")
public Result baseEnterpriseByEntId(Long enterpriseId) {...}
-------------------------------------------------
// #root代表的是spring-context-***.jar中的CacheExpressionRootObject,该类里有Object[] args属性及其getter方法。
@Cacheable(cacheNames = ENTERPRISE_CACHE_KEY, key = "#root.args[0] =0? 0 : #root.args[0]")
public Result getEnterpriseByEntId1(Long enterpriseId) {...}
-------------------------------------------------
// SpEL中调用外部类函数
@Cacheable(cacheNames = ENTERPRISE_CACHE_KEY, key = "T(com.emax.common.MyUtil).foo(#root.args[0])")
public Result getEnterpriseByEntId(Long enterpriseId) {...}
// SpEL中调用外部类函数--- 设置缓存key常用的套路:当缓存key包含一个对象时,则做md5
@Cacheable(cacheNames = ENTERPRISE_CACHE_KEY, key = "T(com.emax.common.Md5Util).sign(T(com.alibaba.fastjson.JSON).toJSONString(#root.args[0]))")
public Result getEnterpriseByEntId2(UserAccountVo userAccountVo, Long enterpriseId) {...}
当看到一些不好的代码时,会发现我还算优秀;当看到优秀的代码时,也才意识到持续学习的重要!--buguge
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