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

Question

我将spring-data-couchbase 2.1.2与spring-boot 1.4.0.RC1和couchbase-spring-cache结合使用

当缓存被禁用时，它工作得很好，因为它在启用缓存时返回空对象，并试图在桶中找到一个不存在的文档，然后抛出一个异常：

com.couchbase.client.java.error.DocumentDoesNotExistException: null
    at com.couchbase.client.java.CouchbaseAsyncBucket$22.call(CouchbaseAsyncBucket.java:684) ~[java-client-2.2.8.jar:na]
    at com.couchbase.client.java.CouchbaseAsyncBucket$22.call(CouchbaseAsyncBucket.java:671) ~[java-client-2.2.8.jar:na]
    at rx.internal.operators.OperatorMap$1.onNext(OperatorMap.java:54) ~[rxjava-1.0.17.jar:1.0.17]
    at rx.observers.Subscribers$5.onNext(Subscribers.java:234) ~[rxjava-1.0.17.jar:1.0.17]
    at rx.subjects.SubjectSubscriptionManager$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$000(AbstractGenericHandler.java:72) ~[core-io-1.2.9.jar:na]
    at com.couchbase.client.core.endpoint.AbstractGenericHandler$1.call(AbstractGenericHandler.java:372) ~[core-io-1.2.9.jar:na]
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55) ~[rxjava-1.0.17.jar:1.0.17]
    at java.util.concurrent.Executors$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.access$201(ScheduledThreadPoolExecutor.java:178) ~[na:1.7.0_80]
    at java.util.concurrent.ScheduledThreadPoolExecutor$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$1.onNext(OperatorMap.java:56) ~[rxjava-1.0.17.jar:1.0.17]
    ... 14 common frames omitted

是因为AsyncBucket吗？可以禁用AsyncBucket吗？

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

Answer 1

这确实是个问题..。一旦对缓存中没有的键进行逐出尝试，异常将被抛出：

我已经为此创建了问题 (带工作环境)。

编辑:要解决这个问题，您应该能够声明一个CacheErrorHandler，该handleCacheEvictError方法只捕获DocumentDoesNotExistException。请参阅关于配置缓存抽象这里和javadoc的文档部分。

Answer 2

我遇到相同的异常，用例是我正在缓存返回null的资源，例如：

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

并使用unless属性@Cacheable对其进行了修正，该属性可在Spring3.2中使用，如下所示：

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

还写了一篇文章，描述了我的问题并修复了相同的- 固定com.couchbase.client.java.error.DocumentDoesNotExistException -耦合基。