Question

I have an application which uses DirectByteBuffers to store data, but I’d like to know what MaxDirectMemorySize is so I don’t accidentally exceed it.

Without configuring this manually, how can I figure out, from within the program, what MaxDirectMemorySize is?

Answer 1

Yuu can get ALL JVM parameters with…

RuntimeMXBean RuntimemxBean = ManagementFactory.getRuntimeMXBean();
List<String> args=RuntimemxBean.getInputArguments();

for(int i=0;i<args.size();i++) {
    System.out.println(args.get(i)); 
}