How to use

getSuppressed

method

in

java.lang.IllegalStateException

@Test
public void afterTerminateCallbackErrorAndErrorCallbackError2() {
  IllegalStateException afterTerminate =
      new IllegalStateException("afterTerminate");
  IllegalArgumentException error = new IllegalArgumentException("error");
  NullPointerException err = new NullPointerException();
  FluxPeek<String> flux = new FluxPeek<>(Flux.error(err), null, null, e -> {
    throw error;
  }, null, () -> {
    throw afterTerminate;
  }, null, null);
  AssertSubscriber<String> ts = AssertSubscriber.create();
  try {
    flux.subscribe(ts);
    fail("expected thrown exception");
  }
  catch (Exception e) {
    assertSame(afterTerminate, e.getCause());
    //afterTerminate suppressed error which itself suppressed original err
    assertEquals(1, afterTerminate.getSuppressed().length);
    assertEquals(error, afterTerminate.getSuppressed()[0]);
    assertEquals(1, error.getSuppressed().length);
    assertEquals(err, error.getSuppressed()[0]);
  }
  ts.assertNoValues();
  //the subscriber still sees the 'error' message since actual.onError is called before the afterTerminate callback
  ts.assertErrorMessage("error");
}

@Test
public void afterTerminateCallbackErrorAndErrorCallbackError2() {
  IllegalStateException afterTerminate = new IllegalStateException("afterTerminate");
  IllegalArgumentException error = new IllegalArgumentException("error");
  NullPointerException err = new NullPointerException();
  FluxPeekFuseable<String> flux = new FluxPeekFuseable<>(
      Flux.error(err),
      null, null,
      e -> { throw error; }, null, () -> { throw afterTerminate; },
      null, null);
  AssertSubscriber<String> ts = AssertSubscriber.create();
  try {
    flux.subscribe(ts);
    fail("expected thrown exception");
  }
  catch (Exception e) {
    assertSame(afterTerminate, e.getCause());
    //afterTerminate suppressed error which itself suppressed original err
    assertEquals(1, afterTerminate.getSuppressed().length);
    assertEquals(error, afterTerminate.getSuppressed()[0]);
    assertEquals(1, error.getSuppressed().length);
    assertEquals(err, error.getSuppressed()[0]);
  }
  ts.assertNoValues();
  //the subscriber still sees the 'error' message since actual.onError is called before the afterTerminate callback
  ts.assertErrorMessage("error");
}

void stop(@Observes final BeforeShutdown beforeShutdown) {
  final IllegalStateException ise = new IllegalStateException("Something went wrong releasing health checks");
  contexts.forEach(c -> {
    try {
      c.release();
    } catch (final RuntimeException re) {
      ise.addSuppressed(re);
    }
  });
  final Throwable[] suppressed = ise.getSuppressed();
  if (suppressed.length == 1) {
    throw RuntimeException.class.cast(suppressed[0]);
  } else if (suppressed.length > 1) {
    throw ise;
  }
}