spring-data-couchbase 为不存在的文档抛出 DocumentDoesNotExistException

Question

我正在使用 spring-data-couchbase 2.1.2 与 spring-boot 1.4.0.RC1 和 couchbase-spring-cache

禁用缓存时工作正常，因为它 returns NULL 对象启用缓存并尝试在存储桶中查找不存在的文档时，它会抛出异常：

com.couchbase.client.java.error.DocumentDoesNotExistException: null
    at com.couchbase.client.java.CouchbaseAsyncBucket.call(CouchbaseAsyncBucket.java:684) ~[java-client-2.2.8.jar:na]
    at com.couchbase.client.java.CouchbaseAsyncBucket.call(CouchbaseAsyncBucket.java:671) ~[java-client-2.2.8.jar:na]
    at rx.internal.operators.OperatorMap.onNext(OperatorMap.java:54) ~[rxjava-1.0.17.jar:1.0.17]
    at rx.observers.Subscribers.onNext(Subscribers.java:234) ~[rxjava-1.0.17.jar:1.0.17]
    at rx.subjects.SubjectSubscriptionManager$SubjectObserver.onNext(SubjectSubscriptionManager.java:223) ~[rxjava-1.0.17.jar:1.0.17]
    at rx.subjects.AsyncSubject.onCompleted(AsyncSubject.java:101) ~[rxjava-1.0.17.jar:1.0.17]
    at com.couchbase.client.core.endpoint.AbstractGenericHandler.completeResponse(AbstractGenericHandler.java:354) ~[core-io-1.2.9.jar:na]
    at com.couchbase.client.core.endpoint.AbstractGenericHandler.access[=11=]0(AbstractGenericHandler.java:72) ~[core-io-1.2.9.jar:na]
    at com.couchbase.client.core.endpoint.AbstractGenericHandler.call(AbstractGenericHandler.java:372) ~[core-io-1.2.9.jar:na]
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55) ~[rxjava-1.0.17.jar:1.0.17]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) ~[na:1.7.0_80]
    at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[na:1.7.0_80]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access1(ScheduledThreadPoolExecutor.java:178) ~[na:1.7.0_80]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292) ~[na:1.7.0_80]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) ~[na:1.7.0_80]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) ~[na:1.7.0_80]
    at java.lang.Thread.run(Thread.java:745) ~[na:1.7.0_80]
Caused by: rx.exceptions.OnErrorThrowable$OnNextValue: OnError while emitting onNext value: com.couchbase.client.core.message.kv.RemoveResponse.class
    at rx.exceptions.OnErrorThrowable.addValueAsLastCause(OnErrorThrowable.java:109) ~[rxjava-1.0.17.jar:1.0.17]
    at rx.exceptions.Exceptions.throwOrReport(Exceptions.java:188) ~[rxjava-1.0.17.jar:1.0.17]
    at rx.internal.operators.OperatorMap.onNext(OperatorMap.java:56) ~[rxjava-1.0.17.jar:1.0.17]
    ... 14 common frames omitted

是不是因为AsyncBucket？是否可以禁用 AsyncBucket？

源代码https://github.com/maverickmicky/spring-couchbase-cache

Answer 1

这确实是个问题...一旦对不在缓存中的密钥进行逐出尝试，就会抛出异常:(

我为此创建了 an issue（有解决方法）。

编辑：要解决这个问题，您应该能够声明一个 CacheErrorHandler，它有一个 handleCacheEvictError 方法，可以简单地捕获 DocumentDoesNotExistException。请参阅有关配置缓存抽象的文档部分 here and the CachingConfigurer javadoc。

Answer 2

我遇到了同样的异常，用例是我正在缓存 return 为空的资源，例如：

@Override
@Cacheable(value = "EMPLOYEE_", key = "#id")
public Employee getEmployee(int id) {
    return null;
}

并使用 @Cacheable 的 unless 属性对其进行了修复，该属性自 Spring 3.2 起可用，如下所示：

@Override
@Cacheable(value = "EMPLOYEE_", key = "#id", unless = "#result == null")
public Employee getEmployee(int id) {
    return null;
}

也写了一篇文章，描述了我的问题并解决了同样的问题 - Fixing com.couchbase.client.java.error.DocumentDoesNotExistException – Couchbase

spring-data-couchbase 为不存在的文档抛出 DocumentDoesNotExistException

spring-data-couchbase throws DocumentDoesNotExistException for non-existent documents

java

spring

spring-boot

spring-cache

spring-data-couchbase