Both G2.1 and G2.2 doc updated as followed:
On a Windows platform
Use forward slash "/" instead of traditional back slash "\" as directory seperators.
geronimo/start-server -j 'c:/programme files/Java60/bin/java.exe'
This issue is addressed by (https://issues.apache.org/jira/browse/GERONIMO-4709)
If possible, I think users would like to see some description/solution along with error message.
Looking into the document is the second choice.