on.html" title="class in jakarta.servlet.jsp">JspException</a></span></div>
<div class="block">Must not be called.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="Tag.html#doStartTag()">doStartTag</a></code>&nbsp;in interface&nbsp;<code><a href="Tag.html" title="interface in jakarta.servlet.jsp.tagext">Tag</a></code></dd>
<dt>Returns:</dt>
<dd>always throws UnsupportedOperationException</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/j