CompletionException 中的 CompletableFuture 提取

Question

此测试失败，因为我收到 CompletionException 异常，但该方法抛出 IllegalArgumentException。所以实际的异常包装到 CompletionException 中。如何提取包装到 CompletionException 中的异常？我特别尝试，处理等但没有给我我想要的。我得到异常 java.util.concurrent.CompletionException: java.lang.IllegalArgumentException: some message.

@Test(expectedExceptions = IllegalArgumentException.class, expectedExceptionsMessageRegExp = "some message")
public void someTest() {
    CompletableFuture.runAsync(() -> someMethodThrowsException()).join();
}

Answer 1

这是您可以执行的操作，以获取您的函数抛出的原始异常：

public class MyTest {

    @Test(expected = IllegalArgumentException.class)
    public void myTest() throws Throwable {
        try {
            CompletableFuture.runAsync(() -> myException()).join();
        } catch (CompletionException e) {
            throw e.getCause();
        }
    }

    public static void myException() {
        throw new IllegalArgumentException();
    }
}

CompletionException 中的 CompletableFuture 提取

CompletableFuture Extract from CompletionException

java

testing

asynchronous

future

completable-future