I have some frequent full GC problems in production with Java, I suspect the memory was allocated by network library for buffering TCP request result.
I have dump the Java heap when the memory usage is high (about 8GB). I tried to analyze the .HPROF file with eclipse MAT, the file is about 8GB.
But in eclipse MAT, the total heap size is about 200 MB, so I could not find which objects are taking up to 8GB heap memory.
Since eclipse MAT is not showing the full heap dump content, I don't know how to find why the application is taking so much memory.