Confluence heap dump fails

I cant pull a heap dump from Confluence using the correct process ID. It gives me the following error:

C:\Program Files\Java\jdk1.7.0_55\bin>jmap -dump:format=b,file=heap.bin 1696
1696: Insufficient memory or insufficient privileges to attach
The -F option can be used when the target process is not responding

The service runs with logon option "Local user account", I started it myself. I'm not sure if tomcat runs as a different user.

Any ideas what could be the problem? Confluence runs from Drive D: with another JRE (default distribution)

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It worked with the -F option after switching to a JDK that has the exact same minor version of the Confluence JRE.

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