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I have found the tools and utilities that come with the Sun-provided Java SDK (especially the monitoring and management tools) to be very useful in daily Java development. I have previously blogged on the use of several of these handy tools such as jps, JConsole, and VisualVM. Although my previous blog posts have generally focused on using a single particular tool to accomplish something, I am using this posting to look at how to acquire JVM runtime information using several different tools. There are many reasons one might desire JVM runtime information. These include the ability to figure out why an application runs differently in two different environments, the ability to use other tools and utilities based on runtime information (such as Java process ID), and the ability to identify Java processes that are not closing even when politely asked.