Ajax4JSF(1.1.0/1.1.1) support jdk 1.4?

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In KeepAliveTag.java, has the following content:

isAjaxOnly = Boolean.parseBoolean(ajaxOnly);

In AjaxFormRenderer.java, has the following content:

script.append("function ").append("clearFormHiddenParams_").append(
formName.replace("-", "$_").replace(':', '_'));

But, In Ajax4jsf Developer Guide, has the following content:

2.1. Supported Java Versions

* JDK 1.4 - 1.6

Why?

Thank you very much.