Little App needs a lotta memory... plz help me debugging

Greetings.
I have programmed a little POP3-Checker in Java, using the JavaMail-API and the SysTray4Java-API. The programm is small, 112 KBytes, but running it needs 21 MB of Memory, the TaskManager says.
That's way too high, he? At first the Program needed between 19MB and 300 Kb Memory, that changed from time to time (most of the time it was at about 4Kb). But after I kept programming a little, it now needs 21MB ALL THE TIME.
So my question to you all is: Why could that happen, is this normal? How could I debug this, means how to find out what exactly needs this amount of memory? Is the GarbageCollector sleeping? (I'm not explicitly calling it in my app)
Advices would be appreciated!
Thanks ;),
AntiBit

Thanx, I will try that.
But I notied something really weird...
I started my App as an Executable-JAR, like I normally do. Like I said before, process "javaw.exe" at first needs 19.000 KB of memory, and after 10 min's, it still needs 19.000KB.
But when I manually run java ProgName in a DOS-prompt, the process "java.exe" at first needs 19.000 KB, like javaw.exe does -
after 10 minutes it only needs 240 KB (!!). So here it's like it should be.
So what's the difference between running the jar and manually running the programm? Why doesn't javaw.exe decrease it's memory-use, but java.exe does?
????!!!????

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