Htop is awesome
At first we simply caught problematic thread using htop (you just need to remember about tree process view, type t-button, or anyway you need to see all forked java processes with its identifiers and CPU usage). We just obtained a java thread wich took more CPU than others. We got an identifier of native OS thread, let it be 3256, but what’s next?
I like jstack, it helps me all the time I deal with spontaneous problems. If you look thru the content of jstack output you’ll see some thread identifiers and all of them are hexadecimal. Thus we converted our native thread id into hex representation 0xcb8. Lazy guys can use Integer.toHexString ;)
The final step
We searched by our hexadecimal string in jstack output (don’t forget about leading zeros, therefore just search by value, i.e. cb8 in our case). Matched nid thread attribute value (suppose stands for native id) was our problematic thread with its stack. In fact we were getting infinite loop. The problem is localized and will be fixed soon.
This guide will introduce you to the world of Software Architecture!
This 162 page guide will cover topics within the field of software architecture including: software architecture as a solution balancing the concerns of different stakeholders, quality assurance, methods to describe and evaluate architectures, the influence of architecture on reuse, and the life cycle of a system and its architecture. This guide concludes with a comparison between the professions of software architect and software engineer.