unresponsive Joseki endpoint after processing a SPARQL update action with incorrect syntax.

[Zhe Wu]

Hi,

I am using Jena 2.6.4, ARQ 2.8.8, and Joseki 3.4.4. There is one problem I 
noticed.
The Joseki endpoint can process SPARQL update actions successfully until a 
request
comes in with incorrect syntax. After that, the endpoint becomes unresponsive.

Is this a known problem?

Thanks,

Zhe