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 ----------