我想将我的caffeine缓存配置为在加载程序无法刷新缓存时返回陈旧的结果。以下Kotlin代码演示了这种情况：

    @Test
    fun `completeble future`() = runBlocking {
        val cache = caffeine.newBuilder()
            .refreshAfterWrite(Duration.ofSeconds(1))
            .expireAfterWrite(Duration.ofSeconds(1))
            .buildAsync<String,String> { key: String,executor ->
                GlobalScope.future(executor.asCoroutineDispatcher()) {
                    throw Exception("== Error ==")
                }
            }

        cache.put("id",CompletableFuture.completedFuture("value"))

        delay(2000)

        assertEquals("value",cache.get("id").await())
    }

我希望该测试通过，但是却出现以下错误：

WARNING: Exception thrown during asynchronous load
java.lang.Exception: == Error ==
    at fsra.manager.TranslationmanagerImplTest$completeble future$1$cache$1$1.invokeSuspend(TranslationmanagerImplTest.kt:93)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
    at kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:241)
    at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteaction.exec(ForkJoinTask.java:1426)
    at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
    at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
    at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
    at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
    at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)




java.lang.Exception: == Error ==

    at fsra.manager.TranslationmanagerImplTest$completeble future$1$cache$1$1.invokeSuspend(TranslationmanagerImplTest.kt:93)
    at |b|b|b(Coroutine boundary.|b(|b)
    at fsra.manager.TranslationmanagerImplTest$completeble future$1.invokeSuspend(TranslationmanagerImplTest.kt:101)
Caused by: java.lang.Exception: == Error ==
    at fsra.manager.TranslationmanagerImplTest$completeble future$1$cache$1$1.invokeSuspend(TranslationmanagerImplTest.kt:93)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
    at kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:241)
    at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteaction.exec(ForkJoinTask.java:1426)
    at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
    at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
    at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
    at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
    at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

我用Kotlin编写了代码，但我认为该问题与Kotlin协程无关。我想将caffeine配置为在刷新时不抛出，而是在缓存中返回之前的结果。