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If you're using two different versions of glassfish (for example bundled one from full NB6 installation with Identity added by updatetool and eesdk glassfish),second one's unable to re-use config files created by other one () and if you try to start it in Netbeans 6.0 and log into AM admin console (in order to write config files in userdir),logging fails. You have to clean config files of first glassfish from userdir and then the second works. This is very rare scenario,since I don't think any identity user will work with other version of glassfish than eesdk (since we support identity only there) and I'm filling this issue mostly for tracking purposes if it changes in future.
Readme now contain paragraph about need to clean userdir,so this shouldn't happen anymore.