public void setDbGroups(java.util.Collection<String> dbGroups) {
        if (dbGroups == null) {
            this.dbGroups = null;
            return;
        }

        this.dbGroups = new com.amazonaws.internal.SdkInternalList<String>(dbGroups);
    }
<p>
A list of the names of existing database groups that the user named in <code>DbUser</code> will join for the
current session, in addition to any group memberships for an existing user. If not specified, a new user is added
only to PUBLIC.
</p>
<p>
Database group name constraints
</p>
<ul>
<li>
<p>
Must be 1 to 64 alphanumeric characters or hyphens
</p>
</li>
<li>
<p>
Must contain only lowercase letters, numbers, underscore, plus sign, period (dot), at symbol (@), or hyphen.
</p>
</li>
<li>
<p>
First character must be a letter.
</p>
</li>
<li>
<p>
Must not contain a colon ( : ) or slash ( / ).
</p>
</li>
<li>
<p>
Cannot be a reserved word. A list of reserved words can be found in <a
href="http://docs.aws.amazon.com/redshift/latest/dg/r_pg_keywords.html">Reserved Words</a> in the Amazon Redshift
Database Developer Guide.
</p>
</li>
</ul>

@param dbGroups
       A list of the names of existing database groups that the user named in <code>DbUser</code> will join for
       the current session, in addition to any group memberships for an existing user. If not specified, a new
       user is added only to PUBLIC.</p>
       <p>
       Database group name constraints
       </p>
       <ul>
       <li>
       <p>
       Must be 1 to 64 alphanumeric characters or hyphens
       </p>
       </li>
       <li>
       <p>
       Must contain only lowercase letters, numbers, underscore, plus sign, period (dot), at symbol (@), or
       hyphen.
       </p>
       </li>
       <li>
       <p>
       First character must be a letter.
       </p>
       </li>
       <li>
       <p>
       Must not contain a colon ( : ) or slash ( / ).
       </p>
       </li>
       <li>
       <p>
       Cannot be a reserved word. A list of reserved words can be found in <a
       href="http://docs.aws.amazon.com/redshift/latest/dg/r_pg_keywords.html">Reserved Words</a> in the Amazon
       Redshift Database Developer Guide.
       </p>
       </li>
aws-java-sdk-redshift/src/main/java/com/amazonaws/services/redshift/model/GetClusterCredentialsRequest.java