<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<body link="#355491" alink="#4262a1" vlink="#355491" style="background: #e2e2e2; margin: 0; padding: 20px;">
<div>
<table cellpadding="0" bgcolor="#FFFFFF" border="0" cellspacing="0" style="border: 1px solid #dadada; margin-bottom: 30px; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td>
<table border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF" style="border: solid 2px #ccc; background: #dadada; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td bgcolor="#000000" valign="middle" height="58px" style="border-bottom: 1px solid #ccc; padding: 20px; -moz-border-radius-topleft: 3px; -moz-border-radius-topright: 3px; -webkit-border-top-right-radius: 5px; -webkit-border-top-left-radius: 5px;">
<h1 style="color: #333333; font: bold 22px Arial, Helvetica, sans-serif; margin: 0; display: block !important;">
<!-- To have a header image/logo replace the name below with your img tag -->
<!-- Email clients will render the images when the message is read so any image -->
<!-- must be made available on a public server, so that all recipients can load the image. -->
<a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">Community</a></h1>
</td>
</tr>
<tr>
<td bgcolor="#FFFFFF" style="font: normal 12px Arial, Helvetica, sans-serif; color:#333333; padding: 20px; -moz-border-radius-bottomleft: 4px; -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 5px; -webkit-border-bottom-left-radius: 5px;"><h3 style="margin: 10px 0 5px; font-size: 17px; font-weight: normal;">
JBoss Reflect Performance Javassist vs Introspection
</h3>
<span style="margin-bottom: 10px;">
reply from <a href="http://community.jboss.org/people/kabir.khan%40jboss.com">Kabir Khan</a> in <i>JBoss Microcontainer Development</i> - <a href="http://community.jboss.org/message/538568#538568">View the full discussion</a>
</span>
<hr style="margin: 20px 0; border: none; background-color: #dadada; height: 1px;">
<div class="jive-rendered-content"><p>I've written an in-AS benchmark which I'll run tomorrow to gather some more information about overheads of creating ClassInfos, looking up methods etc. What I had time to look at so far shows the Javassist implementation to be ~50x slower at obtaining the ClassInfos that the reflect one.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In the meantime, looking into why the BeanMetaData classes don't appear in the statistics, I found this:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">   <font color="navy"><b>protected</b></font> TypeInfo get(String name, ClassLoader cl, Class<?> clazz) <font color="navy"><b>throws</b></font> ClassNotFoundException
   <font color="navy">{</font>
      <font color="navy"><b>if</b></font> (name == <font color="navy"><b>null</b></font>)
         <font color="navy"><b>throw</b></font> <font color="navy"><b>new</b></font> IllegalArgumentException(<font color="red">"Null name"</font>);
      <font color="navy"><b>if</b></font> (cl == <font color="navy"><b>null</b></font>)
         <font color="navy"><b>throw</b></font> <font color="navy"><b>new</b></font> IllegalArgumentException(<font color="red">"Null classloader"</font>);
 
      <font color="navy"><b>try</b></font>
      <font color="navy">{</font>
         CtClass ctClass = poolFactory.getPoolForLoader(cl).get(name);
         <font color="navy"><b>return</b></font> get(ctClass, clazz, cl);
      <font color="navy">}</font>
      <font color="navy"><b>catch</b></font>(NotFoundException nfe)
      <font color="navy">{</font>
         <font color="navy"><b>return</b></font> delegateToIntrospectionImplementation(cl, name); <font color="darkgreen">//End up here for a lot of the bootstrap classes</font>
      <font color="navy">}</font>
   <font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The above code was written to handle gets for generated proxy classes which will not appear in a classpool. As we know, creating Exceptions is very expensive, and could be at least part of the reason why the javassist implementation. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The problem seems to be that in the bootstrap DefaultClassPoolFactory is used until it gets replaced by the real one. Flavia, is there a way to get the real ClassPoolFactory to kick in earlier?</p><div> </div></div>
<div style="background-color: #f4f4f4; padding: 10px; margin-top: 20px;">
<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/538568#538568">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in JBoss Microcontainer Development at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2115">Community</a></p>
</div></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>