This is an experimental rewrite of SIPp in Java, designed to be compatible with the same XML files and command-line arguments, and have roughly equal performance, but to provide a cleaner, smaller, more modular base for faster future development.
A lot of function in SIPp - the hashed wheel timer, select/epoll loops, XML parsing - is part of the Java standard library or available in other common libraries like Netty. Being able to rely on standard implementations of these, and focus on the test-tool-specific logic, should make SIPp a lot smaller, more stable and easier to manage (the C++ version is currently at over 20,000 lines of code compared to under 2,000 in this Java version).
Java is also able to roughly match the performance of C++, which is crucial as one of SIPp's main applications is in performance testing.
Also, one of the main issues with SIPp was the lack of good unit test support - Java's unit testing (for example, with JUnit) seems much more mature than the C++ test libraries.
https://github.com/rkday/jsipp/wiki/Current-Status has a full overview.
It's usable with java -jar jsipp-0.0.5.jar -sf message.xml -r <rate per second> <server>:<port>.
To see the results, an ncurses UI and a web UI are available - see https://github.com/rkday/jsipp/wiki/ZeroMQ#sample-programs.
See the design notes for an overview, and the SIPp docs for a list of the function that needs to be ported over. In particular, more keywords would be great, as would more in-call actions, CSV file injection and maybe 3PCC - I'm planning to focus my own efforts on transport protocols and media handling early on, rather than tackling those areas.
Feedback on the planned future directions would also be useful, especially if there are use-cases it doesn't cover.