I got below windows when starting the NB Java console.
How much memory does your system have?
What Operating system is it?
What version of NetBackup Java Console are you running?
Just increase the MAX_MEMORY variables. It's quite normal I would say when backup environments grow to a certain size. And it's not dangerous :-)
The error message is related to Java memory usage (java console) - Not to Netbackup core memory usage.
See : http://www.symantec.com/docs/TECH65866
Assumption is the mother of all mess ups.
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The error message and instructions on how to solve it are all in that pop-up.
Have you tried to follow those instructions?
The defaults are very small. These are the defaults in Windows setconf.bat:
Supporting Storage Foundation and VCS on Unix and Windows as well as NetBackup on Unix and Windows
Handy NBU Links