public String getMasterUserPassword() {
        return this.masterUserPassword;
    }
<p>
The password for the master user.
</p>
<p>
Constraints:
</p>
<ul>
<li>
<p>
Can't be specified if <code>ManageMasterUserPassword</code> is turned on.
</p>
</li>
<li>
<p>
Can include any printable ASCII character except "/",
""", or "@". For RDS for Oracle, can't include the "&amp;" (ampersand) or the "'" (single quotes) character.
</p>
</li>
</ul>
<p>
Length Constraints:
</p>
<ul>
<li>
<p>
RDS for Db2 - Must contain from 8 to 128 characters.
</p>
</li>
<li>
<p>
RDS for MariaDB - Must contain from 8 to 41 characters.
</p>
</li>
<li>
<p>
RDS for Microsoft SQL Server - Must contain from 8 to 128 characters.
</p>
</li>
<li>
<p>
RDS for MySQL - Must contain from 8 to 41 characters.
</p>
</li>
<li>
<p>
RDS for Oracle - Must contain from 8 to 30 characters.
</p>
</li>
<li>
<p>
RDS for PostgreSQL - Must contain from 8 to 128 characters.
</p>
</li>
</ul>

@return The password for the master user.</p>
        <p>
        Constraints:
        </p>
        <ul>
        <li>
        <p>
        Can't be specified if <code>ManageMasterUserPassword</code> is turned on.
        </p>
        </li>
        <li>
        <p>
        Can include any printable ASCII character except "/",
        """, or "@". For RDS for Oracle, can't include the "&amp;" (ampersand) or the "'" (single quotes)
        character.
        </p>
        </li>
        </ul>
        <p>
        Length Constraints:
        </p>
        <ul>
        <li>
        <p>
        RDS for Db2 - Must contain from 8 to 128 characters.
        </p>
        </li>
        <li>
        <p>
        RDS for MariaDB - Must contain from 8 to 41 characters.
        </p>
        </li>
        <li>
        <p>
        RDS for Microsoft SQL Server - Must contain from 8 to 128 characters.
        </p>
        </li>
        <li>
        <p>
        RDS for MySQL - Must contain from 8 to 41 characters.
        </p>
        </li>
        <li>
        <p>
        RDS for Oracle - Must contain from 8 to 30 characters.
        </p>
        </li>
        <li>
        <p>
        RDS for PostgreSQL - Must contain from 8 to 128 characters.
        </p>
        </li>
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/RestoreDBInstanceFromS3Request.java