A misplaced quotation mark in /bin/service.bat in Confluence 2.9 is preventing the correct operation of instances started using this service. The line is:

"%EXECUTABLE%" //US//%SERVICE_NAME% ++JvmOptions "-Djava.io.tmpdir=%CATALINA_BASE%\temp -XX:MaxPermSize=128m" --JvmMs 128 --JvmMx 256

Should be changed to:

"%EXECUTABLE%" //US//%SERVICE_NAME% ++JvmOptions "-Djava.io.tmpdir=%CATALINA_BASE%\temp" -XX:MaxPermSize=128m --JvmMs 128 --JvmMx 256

Note the moved quotation mark after the "128m".

This issue is causing a similar error to the following in the logs:

SEVERE: Cannot find specified temporary folder at C:\opt\confluence\confluence-2.9-std\temp -XX:MaxPermSize=128m

The result on my specific instance is recorded in https://support.atlassian.com/browse/CSP-22856.

A temporary workaround is to update the line in the service.bat file and re-installing the service, or start Confluence from the startup.bat file instead of running as a service.