A few weeks ago we upgraded from version 6.1.36 to 9.0.21. The installation went perfectly. Since then the JVM memory usage has climbed over 90%. We then doubled the wrapper.java.maxmemory from 4GB to 8GB. Over the last week the used memory has continued to increase and is, again, running >90%. Forcing garbage collection drops usage down to about 82%. It quickly grows back over 90%.

What suggestions do you have as to how we can track down this memory usage?