: multiple points

今天生产环境报了如下异常：

: multiple points
   at (:1890)
   at (:110)
   at (:538)
   at (:169)
   at (:2056)
   at (:1869)
   at (:1514)
   at (:364)
   at (:30)
   at (:18)
   at (:58)
   at $(:116)
   at $(:216)
   at (:879)
   at (:844)
   at (:793)
   at (:765)
   at (:63)
   at (:55)
   at (:22)
   at (:35)
   at (:2762)
   at .(Unknown Source)
   at (:43)
   at (:498)
   at (:127)
   at (:54)
   at (:76)
   at .(Unknown Source)
   at (:43)
   at (:498)
   at (:221)
   at (:136)
   at (:114)
   at (:827)
   at (:738)
   at (:85)
   at (:963)
   at (:897)
   at (:970)
   at (:872)
   at (:648)
   at (:846)
   at (:729)
   at (:292)
   at (:207)
   at (:52)
   at (:240)
   at (:207)
   at (:24)
   at (:107)
   at (:240)
   at (:207)
   at (:32)
   at (:240)
   at (:207)
   at (:197)
   at (:107)
   at (:240)
   at (:207)
   at (:212)
   at (:106)
   at (:502)
   at (:141)
   at (:79)
   at (:88)
   at (:528)
   at .http11.(:1100)
   at $(:687)
   at $(:1520)
   at $(:1476)
   at (:49)
   at (:1142)
   at $(:617)
   at $(:61)
   at (:745)

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之前以为是字符串数值的格式有问题，但是看到异常栈有SimpleDateFormat，去GsonTsTypeAdapter类中查看，发现这么一行代码：

private final DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

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想起SimpleDateFormat是线程不安全的，上网一查，果然如此。使用ThreadLocal或者java8的DateTimeFormatter。

private static DateTimeFormatter dateTimeFormatter = ("yyyy-MM-dd HH:mm:ss");

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