exceptionally in completablefuture

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

answer exceptionally in completablefuture

exceptionally in completablefuture

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In method exceptionally(), you only have access to the exception and not the result. Because as the method name indicates, the method only handles exceptional cases: when an exception happened. If the completable future was completed successfully, then the logic inside “exceptionally” will be skipped.

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

CompletableFuture<String> cf1 =
    cf0.exceptionally(ex -> "Recovered from \"" + ex.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() + "\"";
    });

https://mincong.io/2020/05/30/exception-handling-in-completable-future/

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: completable-future java

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