FULL PRODUCT VERSION :
1.6.0_01

ADDITIONAL OS VERSION INFORMATION :
XP professional 2002 with service pack 2


A DESCRIPTION OF THE PROBLEM :
java.text.SimpleDateFormat.parse method does not works thread safe.

when i want to use single instance of SimpleDateFormat class for multi thread
 applications, sometimes .parse method throws excetion......



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
executable code block can be use for



EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
when i want to use this class as singleton i should not got exceptions
ACTUAL -
i got exceptions ....

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.NumberFormatException: For input string: ""
	at java.lang.NumberFormatException.forInputString(Unknown Source)
	at java.lang.Long.parseLong(Unknown Source)
	at java.lang.Long.parseLong(Unknown Source)
	at java.text.DigitList.getLong(Unknown Source)
	at java.text.DecimalFormat.parse(Unknown Source)
	at java.text.SimpleDateFormat.subParse(Unknown Source)
	at java.text.SimpleDateFormat.parse(Unknown Source)
	at java.text.DateFormat.parse(Unknown Source)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.text.SimpleDateFormat;

public class alll {
	public static void main(String[] args) throws Exception {
		SimpleDateFormat simpleDateFormat =  new SimpleDateFormat("ddMMyyyyHHmm" ) ;
		Tester[] tester = new Tester[10];
		for (int i = 0; i < 10; i++) {
			
			tester[i]  =  new Tester(simpleDateFormat);
			tester[i].start();
			
		}
	}
	/**
	 *
	 */
	private static class Tester extends Thread{
		SimpleDateFormat sp = null;
		public Tester(SimpleDateFormat simpleDateFormat ){
			this.sp = simpleDateFormat;
		}
		public void run(){
			while(true){
				try {
					System.out.println(sp.parse("010120070101"));
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		}

	}
}
---------- END SOURCE ----------
Posted Date : 2007-09-28 05:19:41.0

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