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Settings

You can hide the username/password in your settings.xml. Just ensure that you configure settingsKey in your POM, otherwise it will use your database's URL as a lookup key.

<settings>
  [...]
  <servers>
    <server>
      <id>sensibleKey</id>
      <username>postgres</username>
      <password>password</password>
    </server>
    [...]
  </servers>
  [...]
</settings>

Encrypted passwords

Since 1.5 it's also possible to use encrypted passwords the way Maven does. Follow the instruction of the encryption mini guide. Just like unencrypted passwords you have to be sure to set the settingsKey, the plugin will detect if the password is encrypted or not.