Which jar file include class - weblogic.utils.UnsyncStringBuffer?

When I compile my JSP file by using JDeveloper, but I got "Error: java.lang.NoClassDefFoundError: weblogic/utils/UnsyncStringBuffer". I don't know which jar file is including this class file, and where I can get that jar file?
This is my JSP file header
<%@page language="java" contentType="text/html;charset=UTF-8"%>
<%@taglib uri="netui-tags-databinding.tld" prefix="netui-data"%>
<%@taglib uri="netui-tags-html.tld" prefix="netui"%>
<%@taglib uri="netui-tags-template.tld" prefix="netui-template"%>
<%@taglib uri="cnt.tld" prefix="cnt" %>
<%@taglib uri="cnt-util.tld" prefix="cnt-util" %>
<%@taglib uri="c.tld" prefix="c"%>
Thanks,
lucy

I doubt that a user who hasn't posted in 3+ years is going to wake up and answer you.
Probably best for you to post your details in a new thread (linking to here if you think it adds value)
You can always use Tools->Manage Libraries in JDeveloper and type the class name into the search box; it will tell you which libraries have the class.

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