Dec 16, 2014 · A monitor is an entity that possesses both a lock and a wait set. In Java, any Object can serve as a monitor. For a detailed explanation of how monitors work in Java, I …

Aug 24, 2010 · The condition variable is shared state, so it needs to be locked to avoid race conditions between threads that want to wait and threads that want to notify. Instead of …

Apr 2, 2018 · Monitors Monitor is a synchronization construct that allows threads to have both mutual exclusion (using locks) and cooperation i.e. the ability to make threads wait for certain …

Mar 24, 2012 · The Java Virtual Machine uses monitors to support multithreading. Monitors achieve this through two concepts - Mutual exclusion while running the threads (here is where …

Oct 1, 2019 · In the context of Java programming, the monitor is the intrinsic lock (where intrinsic means "built-in") on a Java object. For a thread to enter any synchronized instance method on …

There are tools that let you monitor the VM's memory usage. The VM can expose memory statistics using JMX. You can also print GC statistics to see how the memory is performing …

52 I want to watch a directory for file changes. And I used WatchService in java.nio. I can successfully listen for file created event. But I can't listen for file modify event. I checked official …

Can I check heap usage of a running JVM from the commandline, I mean the actual usage rather than the max amount allocated with Xmx. I need it to be commandline because I don't have …

Jan 30, 2009 · 120 I've written a log file monitor before, and I found that the impact on system performance of polling the attributes of a single file, a few times a second, is actually very …

Before the collection, the survivor space was 12.44% utilized, but after this collection it is only 7.74% utilized. More heavyweight options are profilers, e.g. JVisualVM with GC monitoring, or …