Hi everybody!
First of all, sorry for my bad english ;-)
After several hours of searching for the cause of a OutOfMemoryError,
I found a wierd problem with Strings. To keep it simple, trimmed it
down to something like this:
ArrayList<String> someStringList = new ArrayList<String>(1000);
for (int i=0; i<1000; i++) {
String someBigString = new String(new char[100000]);
String someSmallString = someBigString.substring(0,1);
someStringList.add(someSmallString);
}
OK, it's not very useful and even though it's a big string, I would
expect it to work properly, because only one char is stored in the
list. But in fact, heap is growing rapidly and OutOfMemoryError
exception will be thrown in 2,3 seconds. And I can't imagin why.
AND NOW the interessting part, a little workaround:
ArrayList<String> someStringList = new ArrayList<String>(1000);
for (int i=0; i<1000; i++) {
String someBigString = new String(new char[100000]);
String someSmallString = someBigString.substring(0,1);
someStringList.add(someSmallString + "BUGFIX");
}
WTF? Why is this now working?
The only difference is the concatenated string (someSmallString +
"BUGFIX")! And as originally expected, with this workaround nearly no
memory will be used ...
Any ideas? I would appreciate it very much, if someone could give me
hint. Maybe I'm missing something basic here?
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