The article delves into the intricacies of monitoring Java applications using Metricbeat and Jolokia, focusing on how these tools can leverage Java Management Extensions (JMX) to extract valuable metrics from Java Virtual Machines (JVMs). JMX provides a framework for managing and monitoring Java applications via MBeans, which represent resources within a JVM. While JMX is traditionally accessible only to Java applications, Jolokia acts as an intermediary by exposing MBeans through a REST-like HTTP endpoint, enabling non-Java applications to access this data. By deploying Jolokia as a JVM agent or via other methods like WAR in Java EE environments, users can gather JMX metrics which Metricbeat can then collect and visualize through Elasticsearch and Kibana. The text also highlights advanced configurations such as grouping fields into different events, using wildcards for mapping multiple MBeans, and utilizing Jolokia Discovery for dynamic environments, which allows Jolokia agents to announce their endpoints and service information for more flexible monitoring setups.