Instant Time parsing error (Unable to obtain Instant from TemporalAccessor)

Question

After running my program, I get this weird crash occurring after around 2 hours of running it stating that it can\'t parse the date.

Text \'2016-10-26T12:31:39.0         


        

Answer 1

You appear to have a local problem with your local JVM, IDE, or OS. I suggest you delete and reinstall your IDE and all your JVMs.

Runs on my computer

I run the following code with ten times the number of your loops (a million) with no problems, no errors. I am using Java 8 Update 111 in NetBeans 8.2 on macOS El Capitan on a MacBook Pro Retina (late 2013).

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 );
        }
    }
}

Runs on IdeOne.com

See a slightly modified version of your code running successfully live on IdeOne.com.

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() );
    }
}

When run.

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

Answer 2

For others having this problem, it was pointed out that the origin of this bug lies in the outdated java version on mac.

To upgrade this version, I installed the latest JDK from: http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html. However after installing this, the old folder doesn't get updated and requires a manual update.

To do this, navigate to: /Library/Java/JavaVirtualMachines/ where you will see 2 different directories containing jdk 1.8.0, a directory named jdk1.8.0.jdk and one named jdk1.8.0_<version>.jdk where version is the release number (for example 111).

Now go ahead and remove the directory called jdk1.8.0.jdk (or move it to a _old folder) and create a symlink pointing towards the new one with sudo ln -s jdk1.8.0_<version>.jdk jdk1.8.0.jdk

This solved the complete problem for me and now the error is not appearing anymore. A big thanks to @assylias and @basil-bourque for the suggestion that lead to this solution.