Bug ID: JDK-6295722 Under heavy load, format will throw an ArrayIndexOutOfBoundsException

Type: Bug
Component: core-libs
Sub-Component: java.text
Affected Version: 5.0

Priority: P4
Status: Closed
Resolution: Cannot Reproduce
OS: windows_2000
CPU: x86

Submitted: 2005-07-12
Updated: 2011-02-16
Resolved: 2005-08-10

FULL PRODUCT VERSION :
Java 1.5.0_3

ADDITIONAL OS VERSION INFORMATION :
Windows 2000 Server, Latest service packs/Window's Updates.

A DESCRIPTION OF THE PROBLEM :
The following code is executed perhaps a half-a-million times a day, but when the load on the server is heavy (say 15x / second), it occasionally bumps with an exception:

public static String getRFC822Date(Date d) {
  SimpleDateFormat df = new SimpleDateFormat("EE, dd MMM yyyy HH:mm:ss zz");
  String s = "";
  try {
    df.setTimeZone(TimeZone.getTimeZone("GMT"));
    s = RFC822DateFormat.format(d);
  }
  catch (Exception e) {
    System.err.println("getRFC822Date(" + d + ") failed. " + e);
  }
  return s;
}

Exception examples:

17/Jun/2005:16:01:36 -0500 getRFC822Date(Fri Jun 17 16:01:36 CDT 2005) failed. java.lang.ArrayIndexOutOfBoundsException: -2147483648
20/Jun/2005:17:45:03 -0500 getRFC822Date(Mon Jun 20 17:45:03 CDT 2005) failed. java.lang.ArrayIndexOutOfBoundsException: -2147483648
21/Jun/2005:09:29:43 -0500 getRFC822Date(Tue Jun 21 09:29:43 CDT 2005) failed. java.lang.ArrayIndexOutOfBoundsException: -2147483648
22/Jun/2005:07:57:49 -0500 getRFC822Date(Wed Jun 22 07:57:49 CDT 2005) failed. java.lang.ArrayIndexOutOfBoundsException: -2147483648
22/Jun/2005:09:25:34 -0500 getRFC822Date(Wed Jun 22 09:25:34 CDT 2005) failed. java.lang.ArrayIndexOutOfBoundsException: -2147483648


A related case seems to be the lastModified() call in java.io.File.

Again, this doesn't happen on every pass. The server can handle an average load of about 5 calls / second, but I start see this error pop up about twice a day, at peak usage, which perhaps exceeds 15 calls / second.




STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run above code under heavy load.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No exception
ACTUAL -
Every now and then, the exception is thrown.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
See above.

17/Jun/2005:16:01:36 -0500 getRFC822Date(Fri Jun 17 16:01:36 CDT 2005) failed. java.lang.ArrayIndexOutOfBoundsException: -2147483648

REPRODUCIBILITY :
This bug can be reproduced occasionally.

---------- BEGIN SOURCE ----------
public static String getRFC822Date(Date d) {
  SimpleDateFormat df = new SimpleDateFormat("EE, dd MMM yyyy HH:mm:ss zz");
  String s = "";
  try {
    df.setTimeZone(TimeZone.getTimeZone("GMT"));
    s = RFC822DateFormat.format(d);
  }
  catch (Exception e) {
    System.err.println("getRFC822Date(" + d + ") failed. " + e);
  }
  return s;
}

---------- END SOURCE ----------
###@###.### 2005-07-12 09:56:52 GMT

EVALUATION The symptom isn't reproducible with the following test program on a 4-processor system for 100 hours. ---- import java.util.*; import java.text.*; public class SDFThreadTest { static volatile boolean runrun = true; public static void main(String[] args) { long millis = System.currentTimeMillis() + (Integer.parseInt(args[0]) * 3600000L); System.out.println("job will end at " + new Date(millis)); Thread[] t = new Thread[4]; for (int i = 0; i < t.length; i++) { t[i] = new Thread(new Work(i)); t[i].start(); } while (millis > System.currentTimeMillis()) { try { Thread.sleep(1000); } catch (InterruptedException e) {} } runrun = false; for (int i = 0; i < t.length; i++) { try { t[i].join(); } catch (Exception e) { } } } public static String getRFC822Date(Date d) { SimpleDateFormat df = new SimpleDateFormat("EE, dd MMM yyyy HH:mm:ss zz"); String s = ""; try { df.setTimeZone(TimeZone.getTimeZone("GMT")); s = df.format(d); } catch (Exception e) { throw new RuntimeException("getRFC822Date(" + d + ") failed. ", e); } return s; } static class Work implements Runnable { final Date date; final String expected; Work(int x) { date = new Date(System.currentTimeMillis() + x * 24 * 3600000); expected = SDFThreadTest.getRFC822Date(date); } public void run() { while (runrun) { String s = getRFC822Date(date); if (!s.equals(expected)) { runrun = false; throw new RuntimeException("got " + s + ", expected " + expected); } } } } } ---- Closing this CR as not reproducible. Please reopen if it's reproducible with a concrete test case. Please note that SimpleDateFormat.format() isn't thread-safe due to the embedded Calendar instance. It is necessary to synchronize a SimpleDateFormat to format or parse a date.

10-08-2005

EVALUATION We'd appreciate it if the submitter can provide its stack trace. ###@###.### 2005-07-12 14:19:52 GMT

12-07-2005