state of the art in Java EE debugging and monitoring tools

I'm digging into Ja开发者_JS百科va EE for the first time in years. I'm looking for recommendations on Java EE debugging and monitoring tools. I'd like to find a tool that lets me dynamically explore the threads space etc.

I'm primarily working with Tomcat. update: and Java 5. (Rats.)

If you are unable to use VisualVM (not sure how it plays with Java5 instances), take a look at Lambda Probe.

Lambda Probe may not have all of the features you want (e.g. threads), but does have quite a few monitoring features and works with Java 4 and 5.

• New! Comprehensive JVM memory usage monitor.
• JBoss compatibility
• Display of deployed applications, their status, session count, session object count, context
  object count, datasource usage etc.
• Start, stop, restart, deploy and updeploy of applications
• Ability to view deployed JSP files
• Ability to compile all or selected JSP files at any time.
• Ability to pre-compile JSP files on application deployment.
• New! Ability to view auto-generated JSP servlets
• Display of list of sessions for a particular application
• Display of session attributes and their values for a particular
  application. Ability to remove
  session attributes.
• Ability to view application context attributes and their values.
• Ability to expire selected sessions
• Graphical display of datasource details including maximum number of
  connections, number of busy
  connections and configuration details
• New! Ability to group datasource properties by URL to help
  visualizing impact on the databases
• Ability to reset data sources in case of applications leaking
  connection
• Display of system information including System.properties, memory
  usage bar and OS details
• Display of JK connector status including the list of requests
  pending execution
• Real-time connector usage charts and statistics.
• Real-time cluster monitoring and clulster traffic charts
• New! Real time OS memory usage, swap usage and CPU utilisation
  monitoring
• Ability to show information about log files and download selected
  files
• Ability to tail log files in real time from a browser.
• Ability to interrupt execution of "hang" requests without server
  restart
• New! Ability to restart Tomcat/JVM via Java Serview Wrapper.
• Availability "Quick check"
• Support for DBCP, C3P0 and Oracle datasources
• Support for Tomcat 5.0.x and 5.5.x
• Support for Java 1.4 and Java 1.5

The state-of-the-art is probably VisualVM.