To produce a thread dump on an unresponsive java process

To produce a thread dump on a java application

$> jstack 29812 > ~/threadDump.txt

where 29812 is the PID of java process

Possible problem : Unable to deduce type of thread from address

Deadlock Detection: Can't print deadlocks:Unable to deduce type of thread from address 0x00007ff514019800 (expected type JavaThread, CompilerThread, ServiceThread, JvmtiAgentThread, or SurrogateLockerThread)

Please help I do not know how to solve the above !!