Help required with understanding References and finalizers

Background
I have an online Application which has been developed over 6 years now. It is a Website CMS and runs 300 simultaneous sites per webserver. For the first time I am experiencing capacity / performance issues. I switched from SUN Java to JROCKIT in 2006 which speeded evertything up by 200% but now I have periods of the day where The memory fills up and I get Swapping which leads to 100% cpu utilization - mainly in I/O. I have upped the RAM in the server as a solution and now I want to see if I can do anything to reduce my memory footprint.
Specifically : The question
I have captured stats which I can view in Mission Control and it shows that the number of Weak References increases continuously over a 4 hour period (also the number of Phantom references shows similar behaviour). Therefore I suspect a memory leak - Also I suspect that this is of my own making since I have not realy had to deal with this before. The thing is I cannot clearly see how to proceed and identify what my error is.
I have spent a couple of weeks reading loads of docs about weak / stong etc.. references but I realy need a bit of help with zeroing in on a starting point. I know that I release objects by setting them to null but I now expect that this is not realy good enough.
Anyway - before I ramble too long, If there is anyone with relevant experience and a few minutes I would be very gratefull to hear from them.
Regards
Jonathan Carter
Glimworm IT
Amsterdam

Hi Jonathan,
Reference objects and finalizers are a frequent cause of performance issues. The reason is that 1) objects tend to be kept alive longer, leading to an increase in live data and more frequent GC and 2) processing of these objects during GC is expensive, which leads to more time spent in GC, i.e. long pause times.
There are various ways you can approach your issue. One is to use -Xverbose to see what you find. If you are using JRockit R27.2 or later, run with "-Xverbose:referents" to get a list of all reference objects at every GC. More info:
http://edocs.bea.com/jrockit/jrdocs/refman/optionX.html#wp1029960
Note that you can enable verbose logging during runtime through "jrcmd <pid> verbosity set=referents" and later disable it using "jrcmd <pid> verbosity set=referents=warn". No JVM restart required.
If you send your JRA recordings to jrockit-improve AT bea DOT com, we'll try to take a look at them.
-- Henrik

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