Java 在Spring Boot中使用咖啡因进行缓存根据输出控制缓存

我有这样的注解:

@CachePut(value="dogsInHouse", unless="#result!=null && #result.desc!=null && result.title!=null")
public DogInHouseResponse getDogInHouseFromDB (String key) throws ExecutionException {
..
}

但我有一个错误:

2023-10-22 10:22:25.644 ERROR [] o.a.c.c.C.[.[.[.[dispatcherServlet]@log(175) - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'result' cannot be found on object of type 'org.springframework.cache.interceptor.CacheExpressionRootObject' - maybe not public or not valid?] with root cause
org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'result' cannot be found on object of type 'org.springframework.cache.interceptor.CacheExpressionRootObject' - maybe not public or not valid?
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:222)
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:105)
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:93)
    at org.springframework.expression.spel.ast.CompoundExpression.getValueRef(CompoundExpression.java:59)
    at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:95)
    at org.springframework.expression.spel.ast.OpNE.getValueInternal(OpNE.java:43)
    at org.springframework.expression.spel.ast.OpNE.getValueInternal(OpNE.java:33)
    at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:212)
    at org.springframework.expression.spel.ast.OpAnd.getBooleanValue(OpAnd.java:57)
    at org.springframework.expression.spel.ast.OpAnd.getValueInternal(OpAnd.java:52)
    at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:119)
    at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:309)
    at org.springframework.cache.interceptor.CacheOperationExpressionEvaluator.unless(CacheOperationExpressionEvaluator.java:113)
    at org.springframework.cache.interceptor.CacheAspectSupport$CacheOperationContext.canPutToCache(CacheAspectSupport.java:783)
    at org.springframework.cache.interceptor.CacheAspectSupport$CachePutRequest.apply(CacheAspectSupport.java:835)
    at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:430)
    at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:345)
    at org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:64)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:756)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:708)