Grails with Powerful OCI Oracle Driver Authenticate Oracle with Wrong User

I have configured Oracle authentication using certificates stored in Oracle wallet, having the following lines in

sqlnet.ora. sqlnet.ora is in my Linux home directory.

 WALLET_LOCATION =
    (SOURCE =
      (METHOD = FILE)
      (METHOD_DATA =
        (DIRECTORY = my_wallet_location)
      )
     )

 SQLNET.WALLET_OVERRIDE = TRUE

      

        
        
        
      

    

And set the username and password to "" in DataSource.groovy

 username=""
 password=""

      

        
        
        
      

    

However, after I ran the grails app, I found that my app had done os authentication, which registered me with Oracle as ops $ john as intended, and ignored my wallet entirely.

Please advise.

Update:

Here is the rest of DataSource.groovy

dataSource {
    pooled = true
    jmxExport = true
    driverClassName = "oracle.jdbc.driver.OracleDriver"
    username=""
    password=""
}
hibernate {
    cache.use_second_level_cache = true
    cache.use_query_cache = true
//    cache.region.factory_class = 'net.sf.ehcache.hibernate.EhCacheRegionFactory' // Hibernate 3
    cache.region.factory_class = 'org.hibernate.cache.ehcache.EhCacheRegionFactory' // Hibernate 4
    singleSession = true // configure OSIV singleSession mode
    flush.mode = 'manual' // OSIV session flush mode outside of transactional context
}

// environment specific settings
environments {
    development {
        dataSource {
            dbCreate = "update" // one of 'create', 'create-drop', 'update', 'validate', ''
            url = "jdbc:oracle:oci:@//myhost:myport/myinstance"
            properties {
                // See http://grails.org/doc/latest/guide/conf.html#dataSource for documentation
                jmxEnabled = true
                initialSize = 5
                maxActive = 50
                minIdle = 5
                maxIdle = 25
                maxWait = 10000
                maxAge = 10 * 60000
                timeBetweenEvictionRunsMillis = 5000
                minEvictableIdleTimeMillis = 60000
                validationQuery = "SELECT 1"
                validationQueryTimeout = 3
                validationInterval = 15000
                testOnBorrow = true
                testWhileIdle = true
                testOnReturn = false
                jdbcInterceptors = "ConnectionState"
                defaultTransactionIsolation = java.sql.Connection.TRANSACTION_READ_COMMITTED
             }
        }
    }
}