Odd heapdump

I opened a heap dump generated from an OutOfMemory in IBM JVM verion 1.4, and then I tried to look into the content of heap rather than leak analysis, find large chunk etc because I know that it was a BIG BI request hit down the server node. So I just want to get the "context" of the thread which was executing the BI query.

I tried run the following OQL:

SELECT toString(s), s.count, s.value FROM java.lang.String s

I got more than 2 million results, but all of them are empty string, all char[] value are "\u0000"

Anyone knows why?

Thanks,

Denny