@Override
    public String getUsername() {
        // An application user is tied to the database, and therefore not authenticated to connect to SID.
        return isUsingSid() ? DEFAULT_SYSTEM_USER : username;
    }
Testcontainers implementation for Oracle Database Free.
<p>
Supported image: {@code gvenzl/oracle-free}
<p>
Exposed ports: 1521
modules/oracle-free/src/main/java/org/testcontainers/oracle/OracleContainer.java