If you are having a problem with a null password when deploying your adf swing app via webstart on a weblogic server you can try the below suggestions. The problem occurs because the connections.xml file does not contain a password for security reasons. The password should be stored in your store and configured in your application but I havent had enough time to figure out how this would work.
Suggestion 1) Use a datasource instead of the JDBC in your am configuration. (1st prize solution)
Suggestion 2) Try the -Djps.app.credential.overwrite.allowed=true (didnt work for me)
Suggestion 3) Untried: Create a secure app and add your db user to the store.
If all else fails give this a go: Enter a custom jdbc url in your database JDBC connection jdbc:oracle:thin:firstname.lastname@example.org:1521:XE