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Validation in struts

 
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Hi,

can anybody help me to validate my input form.

'm trying to do automatic validation on my input form

here are my files:
index.jsp


struts-config.xml


validation.xml
trying to validate only name field



web.xml

HelloForm.java

'm not able to validate if i submit my form with empty
javax.servlet.ServletException: org.apache.jasper.JasperException: /failure.jsp(6,0) Expecting "jsp:param" standard action with "name" and "value" attributes
org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:286)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

 
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