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exception handling in completablefuture

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Pragya Keshap answered on February 12, 2023 Popularity 5/10 Helpfulness 1/10

answer exception handling in completablefuture

exception handling in completablefuture

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1. handle

2. whenComplete

3. exceptionally

CompletableFuture<String> cf0 =
    CompletableFuture.failedFuture(new RuntimeException("Oops"));

CompletableFuture<String> cf1 =
    cf0.handle((msg, ex) -> {
      if (ex != null) {
        return "Recovered from \"" + ex.getMessage() + "\"";
      } else {
        return msg;
      }
    });
CompletableFuture<String> cf0 =
    CompletableFuture.failedFuture(new RuntimeException("Oops"));

CompletableFuture<String> cf1 =
    cf0.whenComplete((msg, ex) -> {
      if (ex != null) {
        System.out.println("Exception occurred");
      } else {
        System.out.println(msg);
      }
      /*
       * Cannot return value because method whenComplete
       * is not designed to translate completion outcomes.
       * It uses bi-consumer as input parameter:
       * BiConsumer<? super T, ? super Throwable> action
       */
    });

try {
  cf1.join();
} catch (CompletionException e) {
  System.out.println("Error: " + e.getMessage());
}
CompletableFuture<String> cf0 =
    CompletableFuture.completedFuture("OK");

CompletableFuture<String> cf1 =
    cf0.exceptionally(ex -> {
      /*
       * This is not called because `exceptionally` is only called
       * when an exception happened. It is not the case here.
       */
      System.out.println("Handling exception");
      return "Recovered from \"" + ex.getMessage() + "\"";
    });

Popularity 5/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: completable-future exception-handling java

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Contributed on Feb 12 2023

Pragya Keshap

0 Answers Avg Quality 2/10

exception handling in completablefuture

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