Name: rmT116609 Date: 05/13/2004


FULL PRODUCT VERSION :
java version "1.4.2_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
Java HotSpot(TM) Client VM (build 1.4.2_04-b05, mixed mode)

java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b32c)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b32c, mixed mode)

A DESCRIPTION OF THE PROBLEM :
When using a Thai collator returned from Collator.getInstance(new Locale("th")) , the Collator.compare(string1, string2) method runs forever when string1 and string2 are identical and the string contains only one of the following Thai characters :

  \u0e40
  \u0e41
  \u0e42
  \u0e43
  \u0e44

Note that the above characters are all special Thai "prefix" vowels.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and run the test case.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The compare method runs forever and never return.
ACTUAL -
The compare method runs forever and never return.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
No exception or error occur

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.text.Collator;
import java.util.Locale;

public class WordCount {
    public static void main(String[] args) {
        Collator c = Collator.getInstance(new Locale("th"));
        String s = "\u0e40";
        // any one of \u0e40, \u0e41, \u0e42, \u0e43, or \u0e44 will do
        System.out.println(c.compare(s, s)); // runs forever
        System.out.println("never reach here");
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Wrap the thai collator with a hard-code check.
(Incident Review ID: 265148)
======================================================================
###@###.### 11/2/04 18:37 GMT
The OutOfMemoryError is prevalent. We tested on Linux and Windows, on JDK versions 1.5 and 1.6.0_16.

 

Here is a simple repro case:

Collator.getInstance(new Locale("th")).getCollationKey("\u0e44");

 

 

This test written covers the OOM scenarios:

            Locale thaiLoc = new Locale("th");

            Collator thaiColl = Collator.getInstance(thaiLoc);

            String [] oomStrings = { "\u0e44", "\u0e43", "\u0e42", "\u0e41", "\u0e40" };

            for (int i=0; i < oomStrings.length;i++) {

              String oom = oomStrings[i];

              CollationKey key = thaiColl.getCollationKey(oom);

              assertEquals("string #"+i, oom, key.getSourceString());

            }