即时解析错误（无法从TemporalAccessor获取Instant）

时间：2016-10-27 07:49:41

标签： java java-time

运行我的程序后，我发现这个奇怪的崩溃发生在大约2个小时的运行之后，它说它无法解析日期。

Text '2016-10-26T12:31:39.084726218Z' could not be parsed: Unable to obtain Instant from TemporalAccessor: {InstantSeconds=1477485099, NanoOfSecond=84726218},ISO of type java.time.format.Parsed
at java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:1919)

有谁知道为什么会这样？从网上看时，我发现这可能是由于格式不正确，但由于我没有指定格式，因此对我来说并非如此。

解析我的时间戳的代码如下：

Instant instant = Instant.parse(cAdvisor.getTimestamp());
Long epoch = instant.getEpochSecond();

注意：cAdvisor.getTimestamp()方法返回一个字符串，例如：'2016-10-26T12:31:39.084726218Z'

注2：我的java版本报告了这个

java version "1.8.0-ea"
Java(TM) SE Runtime Environment (build 1.8.0-ea-b115)
Java HotSpot(TM) 64-Bit Server VM (build 25.0-b57, mixed mode)

更新＃1：以下代码复制了此问题：

import java.time.Instant;
import java.util.Random;

// one class needs to have a main() method
public class Test
{
    // arguments are passed using the text field below this editor
    public static void main(String[] args)
    {
        Random rand = new Random();
        for (int i = 0; i < 100000; i++) {
            String date = "2016-10-26T12:31:39.0847";

            for (int j = 0; j < rand.nextInt(6); j++) {
                date += rand.nextInt(10);
            }

            date += "Z";

            date = date.replace("26", "" + (rand.nextInt(20) + 10));


            Instant instant = Instant.parse(date);
            Long epoch = instant.getEpochSecond();
            System.out.println(epoch);
        }
    }
}

生成以下stacktrace 

Exception in thread "main" java.time.format.DateTimeParseException: Text '2016-10-27T12:31:39.0847Z' could not be parsed: Unable to obtain Instant from TemporalAccessor: {InstantSeconds=1477571499, NanoOfSecond=84700000},ISO of type java.time.format.Parsed
        at java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:1919)
        at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1854)
        at java.time.Instant.parse(Instant.java:392)
        at Test.main(Test.java:23)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
        Caused by: java.time.DateTimeException: Unable to obtain Instant from TemporalAccessor: {InstantSeconds=1477571499, NanoOfSecond=84700000},ISO of type java.time.format.Parsed
        at java.time.Instant.from(Instant.java:375)
        at java.time.Instant$$Lambda$7/1018081122.queryFrom(Unknown Source)
        at java.time.format.Parsed.query(Parsed.java:226)
        at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1850)
        ... 7 more

2 个答案:

答案 0 :(得分：4)

对于有这个问题的其他人，有人指出这个bug的起源在于mac上过时的java版本。

要升级此版本，我安装了最新的JDK：http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html。但是，安装后，旧文件夹不会更新，需要手动更新。

要执行此操作，请导航至：/Library/Java/JavaVirtualMachines/，您将看到2个包含jdk 1.8.0的目录，一个名为jdk1.8.0.jdk的目录和一个名为jdk1.8.0_<version>.jdk的目录，其中version是版本号（例如111）。

现在继续删除名为jdk1.8.0.jdk的目录（或将其移至_old文件夹）并使用sudo ln -s jdk1.8.0_<version>.jdk jdk1.8.0.jdk

创建指向新目标的符号链接

这解决了我的完整问题，现在错误不再出现了。非常感谢@assylias和@ basil-bourque提出的导致此解决方案的建议。

答案 1 :(得分：2)

您的本地JVM，IDE或OS似乎存在本地问题。我建议您删除并重新安装IDE和所有您的JVM。

在我的电脑上运行

我运行以下代码，循环次数为十次（百万次），没有任何问题，没有错误。我在MacBook Pro Retina上的macOS El Capitan上使用NetBeans 8.2中的Java 8 Update 111（2013年末）。

import java.time.Instant;
import java.util.Random;

public class InstantCrash {

    // arguments are passed using the text field below this editor
    public static void main ( String[] args ) {
        Random rand = new Random ();
        for ( int i = 0 ; i < 1_000_000 ; i ++ ) {
            String date = "2016-10-26T12:31:39.0847";

            for ( int j = 0 ; j < rand.nextInt ( 6 ) ; j ++ ) {
                date += rand.nextInt ( 10 );
            }

            date += "Z";

            date = date.replace ( "26" , "" + ( rand.nextInt ( 20 ) + 10 ) );

            Instant instant = Instant.parse ( date );
            Long epoch = instant.getEpochSecond ();
            System.out.println ( epoch );
        }
    }
}

在IdeOne.com

上运行

查看运行成功live on IdeOne.com的代码的略微修改版本。 

import java.util.*;
import java.lang.*;
import java.io.*;
import java.time.Instant;
import java.util.Random;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
       System.out.println( "Starting at: " + Instant.now() );
       Random rand = new Random();
       for (int i = 0; i < 1_000_000; i++) {
            String date = "2016-10-26T12:31:39.0847";

            for (int j = 0; j < rand.nextInt(6); j++) {
                date += rand.nextInt(10);
            }

            if( ( i % 100_000 ) == 0 ) {
                System.out.println( "So far: " + i + " | date: " + date ) ;
            }

            date += "Z";
            date = date.replace("26", "" + (rand.nextInt(20) + 10));

            Instant instant = Instant.parse(date);
            Long epoch = instant.getEpochSecond();
            // System.out.println(epoch);  // Exceeds limit of IdeOne.com.
        }
        System.out.println( "Done. Now: " + Instant.now() );
    }
}

跑步时。

Starting at: 2016-10-30T00:46:34.439Z
So far: 0 | date: 2016-10-26T12:31:39.08476
So far: 100000 | date: 2016-10-26T12:31:39.08478
So far: 200000 | date: 2016-10-26T12:31:39.08475
So far: 300000 | date: 2016-10-26T12:31:39.0847827
So far: 400000 | date: 2016-10-26T12:31:39.0847
So far: 500000 | date: 2016-10-26T12:31:39.0847
So far: 600000 | date: 2016-10-26T12:31:39.0847
So far: 700000 | date: 2016-10-26T12:31:39.084709
So far: 800000 | date: 2016-10-26T12:31:39.0847865
So far: 900000 | date: 2016-10-26T12:31:39.084748
Done. Now: 2016-10-30T00:46:37.698Z
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