Cannot convert # {ad.userid} of type java.lang.String to javax.faces.component.UIComponent

I get the home page, but by going to the JSP page with h:inputText , I get the following error:

  root cause
 javax.servlet.ServletException: javax.servlet.jsp.JspException: org.apache.jasper.el.JspELException: /login.jsp(21,0) '# {ad.userid}' Cannot convert # {ad.userid} of type class java.lang.String to class javax.faces.component.UIComponent
  org.apache.jasper.runtime.PageContextImpl.doHandlePageException (PageContextImpl.java:858)
  org.apache.jasper.runtime.PageContextImpl.handlePageException (PageContextImpl.java:791)
  org.apache.jsp.login_jsp._jspService (login_jsp.java:83)
  org.apache.jasper.runtime.HttpJspBase.service (HttpJspBase.java:70)
  javax.servlet.http.HttpServlet.service (HttpServlet.java:717)
  org.apache.jasper.servlet.JspServletWrapper.service (JspServletWrapper.javahaps77)
  org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java data13)
  org.apache.jasper.servlet.JspServlet.service (JspServlet.java:260)
  javax.servlet.http.HttpServlet.service (HttpServlet.java:717)
  com.sun.faces.context.ExternalContextImpl.dispatch (ExternalContextImpl.java►42)
  com.sun.faces.application.view.JspViewHandlingStrategy.executePageToBuildView (JspViewHandlingStrategy.javahaps59)
  com.sun.faces.application.view.JspViewHandlingStrategy.buildView (JspViewHandlingStrategy.java:150)
  com.sun.faces.lifecycle.RenderResponsePhase.execute (RenderResponsePhase.java:96)
  com.sun.faces.lifecycle.Phase.doPhase (Phase.java:97)
  com.sun.faces.lifecycle.LifecycleImpl.render (LifecycleImpl.java:135)
  javax.faces.webapp.FacesServlet.service (FacesServlet.java:309)

 root cause

 org.apache.jasper.el.JspELException: /login.jsp(21,0) '# {ad.userid}' Cannot convert # {ad.userid} of type class java.lang.String to class javax.faces.component .UIComponent
  org.apache.jasper.el.JspValueExpression.getValue (JspValueExpression.java:107)
  com.sun.faces.application.ApplicationImpl.createComponentApplyAnnotations (ApplicationImpl.java:1878)
  com.sun.faces.application.ApplicationImpl.createComponent (ApplicationImpl.java:443)
  javax.faces.webapp.UIComponentELTag.createComponent (UIComponentELTag.java:218)
  javax.faces.webapp.UIComponentClassicTagBase.createChild (UIComponentClassicTagBase.java:483)
  javax.faces.webapp.UIComponentClassicTagBase.findComponent (UIComponentClassicTagBase.java:667)
  javax.faces.webapp.UIComponentClassicTagBase.doStartTag (UIComponentClassicTagBase.java:1139)
  com.sun.faces.taglib.html_basic.InputTextTag.doStartTag (InputTextTag.java:424)
  org.apache.jsp.login_jsp._jspx_meth_h_005finputText_005f0 (login_jsp.java:253)
  org.apache.jsp.login_jsp._jspx_meth_h_005fform_005f0 (login_jsp.java:168)
  org.apache.jsp.login_jsp._jspx_meth_f_005fview_005f0 (login_jsp.java:113)
  org.apache.jsp.login_jsp._jspService (login_jsp.java:76)
  org.apache.jasper.runtime.HttpJspBase.service (HttpJspBase.java:70)
  javax.servlet.http.HttpServlet.service (HttpServlet.java:717)
  org.apache.jasper.servlet.JspServletWrapper.service (JspServletWrapper.javahaps77)
  org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java data13)
  org.apache.jasper.servlet.JspServlet.service (JspServlet.java:260)
  javax.servlet.http.HttpServlet.service (HttpServlet.java:717)
  com.sun.faces.context.ExternalContextImpl.dispatch (ExternalContextImpl.java►42)
  com.sun.faces.application.view.JspViewHandlingStrategy.executePageToBuildView (JspViewHandlingStrategy.javahaps59)
  com.sun.faces.application.view.JspViewHandlingStrategy.buildView (JspViewHandlingStrategy.java:150)
  com.sun.faces.lifecycle.RenderResponsePhase.execute (RenderResponsePhase.java:96)
  com.sun.faces.lifecycle.Phase.doPhase (Phase.java:97)
  com.sun.faces.lifecycle.LifecycleImpl.render (LifecycleImpl.java:135)
  javax.faces.webapp.FacesServlet.service (FacesServlet.java:309)

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1 answer

On line 21 of login.jsp replace

 <h:inputText binding="#{ad.userid}" /> 

by

 <h:inputText value="#{ad.userid}" /> 

To find out why and for which the binding attribute is intended, click here .

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Source: https://habr.com/ru/post/1315654/


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