Technote

Start->All Programs->Adobe->Flex Data Service 2.0->Start Intergrated Flex Server

and choose 'Properties' from the context menu. On the Shortcut tab append

' > server.log 2>&1'

to the target value

C:\fds2\jrun4\bin\jrun.exe -start default

so that it becomes

C:\fds2\jrun4\bin\jrun.exe -start default > server.log 2>&1

Additionally update the file C:\fds2\jrun4\bin\startJRun.bat by appending the

' > server.log 2>&1'

to the last line so that the files looks like below:

C:
cd "C:\fds2\jrun4\bin"
jrun start default > server.log 2>&1

This will make the Stack Traces available in FusionReactor Administrator.