What tools are used for monitoring heap, threads, connections?

To monitor heap, threads, and connections in Java, you can use the following tools:

• VisualVM — a graphical tool that allows monitoring heap usage, the number of threads, and profiling the application.
• JConsole — a standard JDK tool for monitoring the JVM, including heap, threads, and MBeans.
• Java Flight Recorder (JFR) — an integrated JVM tool for collecting detailed information about application performance.
• Heap Dumps and analyzers (e.g., Eclipse MAT) — for in-depth analysis of heap state.
• Prometheus + JMX Exporter — for collecting JVM metrics and visualizing them in Grafana.
• Netstat or specialized tools (e.g., lsof) — for monitoring network connections.

Example of using VisualVM to monitor heap and threads:

# Launch VisualVM
jvisualvm

In the interface, select the desired process and go to the Monitor (for heap and threads) and Threads sections.