On: A JVM Does That? (2011) [pdf]

[chollida1]

I don't know where you got C++ from.

In any case, I assume they stayed with Java as their entire code base was Java with the exception of what ever they program their FPGAs with.

[TickleSteve → chollida1]

FPGA's are typically used for the real-time front-end in systems like this....

...Which means that the Java side wasn't doing anything particularly quick or real-time.

The Java side was the 'easy&slow' side.... hence they could use Java.

[cheez → chollida1]

Yeah, I concur with what the other guy says. There is no way they were using Java for the HFT side.