The error message specifically says heap, so it seems like heap space, but in general with plugin loading you see PermGen errors. make sure it's not this:
our settings: -Xms256m -Xmx512m -XX:MaxPermSize=256m ..
How does one determine optimum size for these? We don't have that many users, but a relatively large set of plugins<th colspan="2" width="90%">Java VM Memory Statistics</th>
|Maximum Heap Size||488 MB|
|Total Allocated Memory||488 MB|
|Used Memory||411 MB|
|Free Allocated Memory||77 MB|
|Total Free Memory||77 MB|
|Permanent Generation Memory||
|Maximum PermGen||256 MB|
|Used PermGen||174 MB|
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