FULL PRODUCT VERSION :
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)


Also verified it was failing in
java version "1.6.0_45"
Java(TM) SE Runtime Environment (build 1.6.0_45-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

EXTRA RELEVANT SYSTEM CONFIGURATION :
Running Java through Juno.

A DESCRIPTION OF THE PROBLEM :
The specifications for SimpleDateFormat claim that the "h" char is valid for hours 10-12. Although when we attempt to parse "10AM", "11AM", "12AM", "10PM", etc. with the format "ha" it throws a parse exception.





STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a SimpleDateFormat class with the "ha" format. Attempt to parse "12AM". Notice a ParseException is thrown.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No Exception
ACTUAL -
Failed to parse 10AM
Failed to parse 10PM
Failed to parse 11AM
Failed to parse 11PM
Failed to parse 12AM
Failed to parse 12PM


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
Sample Code -

import java.text.ParseException;
import java.text.SimpleDateFormat;

public class test{
  /**
   * @param args
   * @throws ParseException
   */
  public static void main(String[] args){
    // SimpleDateFormat timeslotDateTimeFormat = new SimpleDateFormat("MMM d, yyyy ha");
    SimpleDateFormat timeslotDateTimeFormat = new SimpleDateFormat("ha");

    String time = "$";
    // String date = "Jan 27, 2015";
    String am = "AM";
    String pm = "PM";
    int counter = 1;
    while(counter < 13){
      try{
        time = counter + am;
        // time = date + " " + counter + am;
        timeslotDateTimeFormat.parse(time);
      }catch(ParseException e){
        System.out.println("Failed to parse " + time);
      }
      try{
        time = counter + pm;
        // time = date + " " + counter + pm;
        timeslotDateTimeFormat.parse(time);
      }catch(ParseException e){
        System.out.println("Failed to parse " + time);
      }
      counter++;
    }
  }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
I have begun using the "hha" format, but this requires me to parse out the leading zeros of the single digit times.