Database Software

I read the article about integrating oracle spatial with google earth and started installing Geoserver.
When I created try to create a new data store i get following screen
"Create New Feature Data Set "
somehow i went ahead and entered oracle and userid to edit data store but saw the screen
"Feature Data Set Editor ".
It appears that documentation and geoserver screens do not match.
finally when I tried to create a 'New feature type' while I was on 'NEW FEATURE TYPE CONFIGURATION' screen I got
I selected the 'AA' which was in my account and got following error:

The following exception was thrown:
java.lang.IllegalArgumentException: Duplicate AttributeTypes DefaultAttributeType [name=AACE , type=class java.lang.String , nillable=true, min=1, max=1]

then i tried to create counties feature type imported from sample code:
i again got similar error:

The following exception was thrown:
java.lang.IllegalArgumentException: Duplicate AttributeTypes DefaultAttributeType [name=COUNTY , type=class java.lang.String , nillable=true, min=1, max=1]

I do have java 1.5 installed on my machine.

any clue?

thank you
jay