Displaying Swing components in JEditorPane using HTML OBJECT tag

[Baps Vakkalagadda]

I am developing a HTML Browser that display HTML using JEditorPane. HTML contains Object tags to display Swing components.

My HTML text contains the following snippet.

<OBJECT class="javax.swing.JLabel" id="label0">
<PARAM name="text" value="Swing Label">
</OBJECT>
<OBJECT class="com.browser.CustomLabel" id="custlabel0">
</OBJECT>

CustomLabel is my class, which extends javax.swing.JLabel. This code works fine with java 1.4.2. But if i use java 1.3, then JVM is not able to recognize my CustomLabel class. It is not even creating an object for it. I tested it with few debug statements.

Can anyone tell me why java 1.3 is not able to recognize my class?