Java 双端队列/准备语句内存泄漏

Question

以下代码片段之一会产生内存泄漏，您知道是哪一部分吗？

1)

private Deque<Snapshot> snapshots = new LinkedList<Snapshot>();

Iterator<Snapshot> i = world.getSnapshots().descendingIterator();
    while (i.hasNext()) {
        Snapshot s = i.next();
        if (curTime - s.getTimestamp() > 60000) {
            i.remove();
        } else {
            break;
        }
    }

2)

public static void initilizePreparedStatements() {
        try {
            insertNewReportRow = Instance.getWorld().getDB().getConnection().prepareStatement("INSERT INTO `rsca2_reports` (`from`, `about`, `time`, `reason`, `snapshot_from`,`snapshot_about`,`chatlogs`, `from_x`, `from_y`, `about_x`, `about_y`) VALUES(?,?,?,?,?,?,?,?,?,?,?)");
        } catch (SQLException e) {
            e.printStackTrace();
            Logger.error(e);
        }
    }
    public synchronized static void submitReport() {
        /*removed*/
            try {
                    insertNewReportRow.setLong(1, from);
                    insertNewReportRow.setLong(2, about); 
                    insertNewReportRow.setLong(3, time); 
                    insertNewReportRow.setInt(4, reason);
                    insertNewReportRow.setString(5, snapshot_from);
                    insertNewReportRow.setString(6, snapshot_about);
                    insertNewReportRow.setString(7, chatlog);
                    insertNewReportRow.setInt(8, f.getX());
                    insertNewReportRow.setInt(9, f.getY());
                    insertNewReportRow.setInt(10, a.getX());
                    insertNewReportRow.setInt(11, a.getY());
                    insertNewReportRow.executeUpdate();
                } catch (SQLException e) {
                    e.printStackTrace();
                    Logger.error(e);
                } 
            }

Answer 1

我的猜测是，您可以在 Instance.getWorld().getDB().getConnection() 中获取连接，并且仅存储对其创建的准备好的语句的引用。这意味着当代码使用准备好的语句完成时，您不会释放连接，并且(假设它来自连接池)连接池不会回收连接，但会在其映射中保留对它的引用。