the file login-config.xml contains plain password masterkey:
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<application-policy name = "FirebirdDBRealm">

<login-module code = "org.jboss.resource.security.ConfiguredIdentityLoginModule"
flag = "required">
<module-option name = "principal">sysdba</module-option>
<module-option name = "userName">sysdba</module-option>
<module-option name = "password">masterkey</module-option>
<module-option name = "managedConnectionFactoryName">jboss.jca:service=XaTxCM,name=FirebirdDS</module-option>
</login-module>

</application-policy>

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how to secure passwords in login-config.xml ?