void sessionStarted(ExecutionEvent event);

    void projectStarted(String projectId);

    void projectLogMessage(String projectId, String event);

    void projectFinished(String projectId);

    void executionFailure(String projectId, boolean halted, String exception);

    void mojoStarted(ExecutionEvent event);

    void finish(int exitCode) throws Exception;

    void fail(Throwable t) throws Exception;

                            && !MavenExecutionRequest.REACTOR_FAIL_AT_END.equals(session.getReactorFailureBehavior());
        }
        Throwable cause = projectExecutionEvent.getCause();
        buildEventListener.executionFailure(
                projectExecutionEvent.getProject().getArtifactId(), halted, cause != null ? cause.toString() : null);
    }

    @Override
    public void projectDiscoveryStarted(ExecutionEvent event) {