@Override
    public Optional<Boolean> failAtEnd() {
        return returnFirstPresentOrEmpty(MavenOptions::failAtEnd);
    }

    @Override
    public Optional<Boolean> failNever() {
        return returnFirstPresentOrEmpty(MavenOptions::failNever);
    }

    @Override
    public Optional<Boolean> resume() {
        return returnFirstPresentOrEmpty(MavenOptions::resume);
    }

    @Override

            cmdAndArguments.add("--fail-fast");
        }
        if (mavenOptions.failAtEnd().orElse(false)) {
            cmdAndArguments.add("--fail-at-end");
        }
        if (mavenOptions.failNever().orElse(false)) {
            cmdAndArguments.add("--fail-never");
        }
        if (mavenOptions.resume().orElse(false)) {
            cmdAndArguments.add("--resume");
        }

     *
     * @return an {@link Optional} containing true if the build should never fail, false if it should fail normally, or empty if not specified
     */
    @Nonnull
    Optional<Boolean> failNever();

    /**
     * Indicates whether Maven should resume from the last failed project in a previous build.
     *

                || FAIL_AT_END.equals(failureBehavior)
                || FAIL_NEVER.equals(failureBehavior)) {
            this.failureBehavior = failureBehavior;
        } else {
            throw new IllegalArgumentException("Invalid failure behavior (must be one of: '" + FAIL_FAST + "', '"
                    + FAIL_AT_END + "', '" + FAIL_NEVER + "').");
        }
    }

    public String getFailureBehavior() {

Calls are executed in one of two ways:

 * **Synchronous:** your thread blocks until the response is readable.