我在 Ubuntu 上有一个 java Spring boot 应用程序，它（主要）运行良好。但是，如果我访问一个调用控制器的网站 - 数据被获取，网站被显示，但几秒钟后 - 该应用程序被杀死......

我在 Ubuntu 上有一个 java Spring boot 应用程序，它（主要）运行良好。

但是，如果我访问一个调用控制器的网站 - 数据被获取，网站被显示，但几秒钟后 - 应用程序被杀死！（ps -ef 不显示应用程序，控制器都死了）。

我试图在这个类中捕捉 Spring 关闭操作：

@Slf4j
@Component
public class AlpacaServiceLifeCycle implements CommandLineRunner {
    @Override
    public void run(String... arg0) throws Exception {
        log.info("###START FROM THE LIFECYCLE###");
    }

    @PreDestroy
    public void onExit() {
        log.info("###STOP FROM THE LIFECYCLE###");
        new Exception().printStackTrace();
    }
}

还有这个类：

@Component
public class ContextClosedEventListener {
    @EventListener(ContextClosedEvent.class)
    public void onContextClosedEvent(ContextClosedEvent     contextClosedEvent) {
        System.out.println("ContextClosedEvent occurred     at millis: " + contextClosedEvent.getTimestamp());
        new Exception().printStackTrace();
    }
}

此外，有问题的类实现了SmartLifecycle。

但仍然什么也没有显示！

如果应用程序内存不足，则会抛出异常并创建文件告诉我发生了什么。但这里不是（您可以看到数据保存在表中 - 表大小（一行）为 0.02MB）。

会不会是 ubuntu 以某种方式杀死了该应用程序？

有问题的控制器：

@Slf4j
@RestController
@RequestMapping("/positions")
public class PositionsController implements SmartLifecycle {
    private static final String BODY_HTML_END = "\t</body>\n" +
            "</html>";
    private static final String alpacaLink = "https://app.alpaca.markets/trade/{*}";

    @Autowired
    private PositionsFetchService positionsFetchService;
    @Autowired
    private SellStocksDailyIndicatorScheduler sellStocksDailyIndicator;
    @Autowired
    private DailyPurchaseLogCache dailyPurchaseLogCache;

    @Resource
    private PositionTableRepository positionTableRepository;
    
    @RequestMapping(value = "/list", method = RequestMethod.GET, produces = {MediaType.TEXT_HTML_VALUE})
    @ResponseStatus(HttpStatus.OK)
    public String list(@RequestParam(name = "soa", required = false) Boolean showOnlyAvailable) throws Exception {
        log.info("Positions called");
        
        if (positionTableRepository.findByFetchDate(LocalDate.now()) != null) {
            log.info("Fetching from DB");
            return positionTableRepository.findByFetchDate(LocalDate.now()).getTableStr();
        }
        
        Set<OutptOrderEntity> allOrders = dailyPurchaseLogCache.fetchAllOrders(false);
        StringBuilder theTable = new StringBuilder(CONSTANT_VISIBLE_HEADERS + "\t\t<table class=\"sortable\">");
        theTable = new StringBuilder(theTable.toString().replace("*TITLE*", "Positions"));
        theTable.append("\t\t<th>#</th>\n");
        theTable.append("\t\t<th>Created At</th>\n");
        theTable.append("\t\t<th>symbol</th>\n");
        theTable.append("\t\t<th>avg_entry_price</th>\n");
        theTable.append("\t\t<th>current_price</th>\n");
        theTable.append("\t\t<th>qty_available</th>\n");
        theTable.append("\t\t<th>cost_basis</th>\n");
        theTable.append("\t\t<th>market_value</th>\n");
        theTable.append("\t\t<th>diff</th>\n");
        theTable.append("\t\t<th>change_today</th>\n");
        theTable.append("\t\t<th>lastday_price</th>\n");
        theTable.append("\t\t<th>qty</th>\n");
        theTable.append("\t\t<th>unrealized_pl</th>\n");

        List<PositionEntity> positionEntities = positionsFetchService.fetch();

        for (int i = 0; i < positionEntities.size(); i++) {
            PositionEntity curr = positionEntities.get(i);
            if (curr.getAvg_entry_price() != null && curr.getCurrent_price() != null) {
                try {
                    String symbol = curr.getSymbol();
                    List<OutptOrderEntity> ordersOfSymbol = allOrders.stream().filter(s -> s.getSymbol().equals(symbol)).collect(Collectors.toList());
                    if (ordersOfSymbol.isEmpty()) {
                        log.warn("Symbol {} doesn't have data", symbol);
                        continue;
                    }
                    LocalDateTime createdAt = ordersOfSymbol.get(ordersOfSymbol.size() - 1).getCreated_at();
                    if (showOnlyAvailable && Float.parseFloat(curr.getQty_available()) > 0f) {
                        theTable.append(new TableData(false, alpacaLink.replace("{*}", curr.getSymbol()),
                                i + 1, createdAt, curr.getSymbol(), curr.getAvg_entry_price(), curr.getCurrent_price(), curr.getQty_available(), curr.getCost_basis(), curr.getMarket_value(),
                                Float.parseFloat(curr.getMarket_value()) - Float.parseFloat(curr.getCost_basis()), curr.getChange_today(), curr.getLastday_price(), curr.getQty(), curr.getUnrealized_pl()).
                                createString(Float.parseFloat(curr.getCurrent_price()) > Float.parseFloat(curr.getAvg_entry_price())));

                    } else if (!showOnlyAvailable) {
                        theTable.append(new TableData(false, alpacaLink.replace("{*}", symbol),
                                i + 1, createdAt, curr.getSymbol(), curr.getAvg_entry_price(), curr.getCurrent_price(), curr.getQty_available(), curr.getCost_basis(), curr.getMarket_value(),
                                Float.parseFloat(curr.getMarket_value()) - Float.parseFloat(curr.getCost_basis()), curr.getChange_today(), curr.getLastday_price(), 
                                curr.getQty(), curr.getUnrealized_pl()). createString(Float.parseFloat(curr.getCurrent_price()) > Float.parseFloat(curr.getAvg_entry_price())));
                    }
                } catch (Exception e) {
                    log.error(e.toString(), e);
                }
            }
        }

        theTable.append("\t\t\t<script src=\"https://www.kryogenix.org/code/browser/sorttable/sorttable.js\"></script>");
        theTable.append("\n\t\t</table>\n");
        theTable.append(BODY_HTML_END);
        log.info("Fetched all positions");

        positionTableRepository.save(new PositionsTableEntity(theTable.toString()));
        
        return theTable.toString();
    }

    @RequestMapping(value = "/sell_qty_exists", method = RequestMethod.GET, produces = {MediaType.TEXT_HTML_VALUE})
    @ResponseStatus(HttpStatus.OK)
    public void sellQtyExists() throws Exception {
        sellStocksDailyIndicator.scalpOnAllIndicators();
    }

    @Override public boolean isAutoStartup() {
        return false;
    }

    @Override public void stop(Runnable runnable) {
        new Exception().printStackTrace();
    }

    @Override public void start() {

    }

    @Override public void stop() {
        new Exception().printStackTrace();
    }

    @Override public boolean isRunning() {
        return false;
    }

    @Override public int getPhase() {
        return 0;
    }
}