If you are planning to integrate captcha in you liferay custom portlet then use below stuff
view.jsp:
<%@taglib uri="http://liferay.com/tld/captcha" prefix="liferay-captcha" %>
<portlet:resourceURL id="/login/captcha" var="captchaURL"/>
<liferay-captcha:captcha url="<%=captchaURL%>" />
Write CaptchaMVCResourceCommand.java :
@Component(
property = {
"javax.portlet.name=test_portlet",
...
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