此代码逐渐消耗大约130 MB的内存(由于依赖关系),并且在我不得不终止并重新启动之前(由于服务器内存不足),一直爬升至800+ MB。
它与OpenJDK 11一起运行。我在Java 8服务器上运行此代码的较旧版本,该服务器的内存使用率保持稳定且从未增加。所以我不确定是否与新的JDK有关?
我在这里修改了很多代码以确保它尽可能简单-但仍然存在问题。
基本要点-它是否每隔几秒钟就查询数据库中是否有未结发票。但是,由于没有待处理的发票(日志也证明了这一点),因此它永远不会进入复杂的代码位置,并且只会每隔几秒钟重复一次。
public static void main(String[] args) {
...
final int interval = Constants.INTERVAL;
QuickBooksInvoices qbInvoices = new QuickBooksInvoices(filename);
qbInvoices.testConnection();
log.log(Level.INFO, "Checking invoices with an interval of " + interval + " seconds...");
while (isRunning == true) {
qbInvoices.process();
try {
Thread.sleep(interval * 1000);
} catch (InterruptedException e) {
}
}
}
public void process() {
errorBuffer.clear(); // These are array lists
successBuffer.clear(); // These are array lists
try (Connection conn = DriverManager.getConnection(dbURI, dbUser, dbPassword)) {
ArrayList<com.xxx.quickbooks.model.wdg.Invoice> a = getInvoices(conn);
OAuthToken token = null;
if (a.size() > 0) {
// Never gets here - no results
}
for (com.xxx.quickbooks.model.wdg.Invoice invoice : a) {
// Never gets here - no results
}
} catch (Exception e) {
writeLog(Level.ERROR, ExceptionUtils.getStackTrace(e));
}
}
private ArrayList<com.xxx.quickbooks.model.wdg.Invoice> getInvoices(Connection conn) {
ArrayList<com.xxx.quickbooks.model.wdg.Invoice> invoices = new ArrayList<com.xxx.quickbooks.model.wdg.Invoice>();
String sql =
"select " +
"id," +
"type," +
"status," +
"business_partner_id," +
"invoice_number," +
"total," +
"nrc," +
"szrc," +
"trans_ts," +
"warehouse_id," +
"due_date," +
"ref_number," +
"payment_type " +
"FROM dv_invoice " +
"WHERE exported_ts is NULL AND exported_msg is NULL ; ";
try (
PreparedStatement stmt = conn.prepareStatement(sql);
ResultSet rs = stmt.executeQuery();
) {
while (rs.next()) {
// Never gets here - no results
}
} catch (SQLException e) {
writeLog(Level.ERROR, ExceptionUtils.getStackTrace(e));
}
return invoices;
}