Finding Memory Usage in Java

Question

Following is the scenario i need to solve. I have struck with two solutions.

I need to maintain a cache of data fetched from database to be shown on a Swing GUI. Wheneve

Answer 1

It is entirely normal for a JVM to go up to 100% memory usage and them back to say 10% after a GC and do this every few second.

You shouldn't need to try managing the memory in this way. You cannot say how much memory is being retained until a full GC has been run.

I suggest you work out what you are really trying to achieve and look at the problem another way.