1. Monitoring and Management Mihail Stoynov mihail.stoynov.com mihail.stoynov.com

2. Java Process Status Tool jps

4. Dynamic Attach – You can connect to every process started in Java SE 6 HotSpot VM (through Attach API) – No more -Dcom.sun.management.jmxremote on every application (Management Agent) Remote monitoring – Can be password protected Secure remote monitoring (SSL)

5. Can follow memory Can see stack trace, thread state Can see VM summary Can detect deadlocks Can see all the MBeans from JMX Can be used to detect & warn for low memory Can tell CPU usage Can save all

6. A simple application seen through JConsole, jstack

7. Remote monitoring using JConsole

8. Finding memomy leaks C:\>jmap -histo 3328 See how much instances every class has See how much memory instances occupy Can filter only live objects in the heap Can save to a binary file format – JConsole can do that through an JMX Mbean – Can read with jhat

9. Saving using JConsole

10. Heap Histogram on OutOfMemoryError jinfo –flag +HeapDumpOnOutMemoryError... java.lang.OutOfMemoryError: Java heap space Dump heap to java_pid1412.hprof... Heap dump file created [68354173 bytes in 4.416 secs ] Exception in thread "main" java.lang.OutOfMemoryError: Java heap space... C:\>jhat java_pid1412.hprof

11. Monitoring and Management Mihail Stoynov mihail.stoynov.com mihail.stoynov.com