Oracle released a new JDK 6u23 6u32 yesterday wich fixes an annoying bug, a leak of native memory.
The stability tests at e-spirit for this JDK just begun, so I can't yet recommend switching to this version.
Meanwhile I recommend to add the following parameter to your fs-server.conf to minimize the impact of this bug to your FirstSpirit instance:
memory.gcMaxTimeWarn=0
You should also avoid requesting this MBean, manually or automatically (e.g. with 'jconsole' or 'visualVM' tool).
