ext, and returns <code>true</code> if a call to
 <a href="../../../../../jakarta/el/ValueExpression.html#setValue-jakarta.el.ELContext-java.lang.Object-"><code>ValueExpression.setValue(jakarta.el.ELContext, java.lang.Object)</code></a> will always fail.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../jakarta/el/ValueExpression.html#isReadOnly-jakarta.el.ELContext-">isReadOnly</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../jakarta/el/