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POJSF, writeAttribute("value", str, null) fails with strings obtained through ValueExpression.getValue()
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  1. POJSF, writeAttribute("value", str, null) fails with strings obtained through ValueExpression.getValue()
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    copied!<p>I'm having a somewhat weird problem with custom JSF component.</p> <p>Here's my renderer code:</p> <pre><code>public class Test extends Renderer { public void encodeBegin(final FacesContext context, final UIComponent component) throws IOException { ResponseWriter writer = context.getResponseWriter(); writer.startElement("textarea", component); String clientId = component.getClientId(context); if (clientId != null) writer.writeAttribute("name", clientId, null); ValueExpression exp = component.getValueExpression("value"); if (exp != null &amp;&amp; exp.getValue(context.getELContext()) != null) { String val = (String) exp.getValue(context.getELContext()); System.out.println("Value: " + val); writer.writeAttribute("value", val, null); } writer.endElement("textarea"); writer.flush(); } } </code></pre> <p>The code generates:</p> <pre><code>&lt;textarea name="j_id2:j_id12:j_id19" value=""&gt;&lt;/textarea&gt; </code></pre> <p>Property binding contains "test" and as it should be, "Value: test" is successfully printed to console.</p> <p>Now, if I change the code to: </p> <pre><code>public void encodeBegin(final FacesContext context, final UIComponent component) throws IOException { ResponseWriter writer = context.getResponseWriter(); writer.startElement("textarea", component); String clientId = component.getClientId(context); if (clientId != null) writer.writeAttribute("name", clientId, null); ValueExpression exp = component.getValueExpression("value"); if (exp != null &amp;&amp; exp.getValue(context.getELContext()) != null) { String val = (String) exp.getValue(context.getELContext()); String str = "new string"; System.out.println("Value1: " + val + ", Value2: " + str); writer.writeAttribute("value", str, null); } writer.endElement("textarea"); writer.flush(); } </code></pre> <p>generated html is:</p> <pre><code>&lt;textarea name="j_id2:j_id12:j_id19" value="new string"&gt;&lt;/textarea&gt; </code></pre> <p>and console output is "Value1: test, Value2: new string"</p> <p>What's going on here? This doesn't make sense. Why would writeAttribute differentiate between the two strings?</p> <p>Additional info:</p> <ul> <li>The component extends UIComponentBase</li> <li>I am using it with facelets </li> </ul>
 

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