How to determine the java memory cosumption

Hi.
In our system Netweaver7.1, (on windows)
I want to know java heap memory consumption.
We can see the memory consumption from windows task manager, but the AS JAVA caught the memory heap memory size during startup.
So itisn't correct.
In NWA, many paerformance monitors are, but I don't know which tool is useful.
I want to sizing the memory size with following logic.
8:00～9:00 50% load
The java memory is conusmed 3GB.
11:00～12:00 100% load
The java memorry will "may" be consumed 6GB.
regards,

I found the directory with java.exe on my XP client. After updating my Path and then typing 'java -versions' I still see a 'java not found message'. No problem though - a README.TXT says that I have JRE 1.1.7B.
One final question - a co-worker who also has XP just starting seeing a pop-up window saying 'Runtime' error when running a Java applet. His java.exe is in a path that includes the sub-directory 'JRE' On my XP client, java.exe is in a path which includes a 'JRE11' sub-directory. We therefore seem to have different versions of the JRE. Since I don't see the Runtime error when running the same applet, should my co-worker try upgrading his JRE?
Thank you.

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