public String getEngine() {
        return this.engine;
    }
<p>
The database engine. RDS Custom for Oracle supports the following values:
</p>
<ul>
<li>
<p>
<code>custom-oracle-ee</code>
</p>
</li>
<li>
<p>
<code>custom-oracle-ee-cdb</code>
</p>
</li>
<li>
<p>
<code>custom-oracle-se2</code>
</p>
</li>
<li>
<p>
<code>custom-oracle-se2-cdb</code>
</p>
</li>
</ul>

@return The database engine. RDS Custom for Oracle supports the following values:</p>
        <ul>
        <li>
        <p>
        <code>custom-oracle-ee</code>
        </p>
        </li>
        <li>
        <p>
        <code>custom-oracle-ee-cdb</code>
        </p>
        </li>
        <li>
        <p>
        <code>custom-oracle-se2</code>
        </p>
        </li>
        <li>
        <p>
        <code>custom-oracle-se2-cdb</code>
        </p>
        </li>
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/ModifyCustomDBEngineVersionRequest.java