Open Source Profilers in Java

TomcatProbe is a real-time monitoring and management tool for Apache Tomcat. It is very easy to deploy and requires no modification to either Tomcat or running applications. Tomcatprobe allows real-time monitoring of deployed applications and their status, active http sessions and their attributes, datasources, their details and current usage. It also shows requests that are being executed, sizes of application footprints in memory, enables on-the-fly application deployment with JSP precompilation. System information view displays Java runtime version, graphical memory usage, OS information and system properties. \"Quick check\" options allows to check usage of all resources including all datasources, file handles and memory in one click.