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Struts

Problem with login page

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posted 15 years ago

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I am trying to made small login applicatio in which the user enters the username and passsword and on submitting the page a username is displayed....

Here is the code for it

web.xml

struts-config.xml

login.jsp

loggedIn.jsp

formBean

Error Page

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: LinkParam tag must be nested in a Link, Rewrite, or Frame tag
	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:717)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)

root cause

javax.servlet.ServletException: LinkParam tag must be nested in a Link, Rewrite, or Frame tag
	org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
	org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
	org.apache.jsp.loggedIn_jsp._jspService(loggedIn_jsp.java:78)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:298)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	org.apache.struts.chain.commands.servlet.PerformForward.handleAsForward(PerformForward.java:113)
	org.apache.struts.chain.commands.servlet.PerformForward.perform(PerformForward.java:96)
	org.apache.struts.chain.commands.AbstractPerformForward.execute(AbstractPerformForward.java:54)
	org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
	org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
	org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)
	org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
	org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
	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:717)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)

root cause

javax.servlet.jsp.JspException: LinkParam tag must be nested in a Link, Rewrite, or Frame tag
	org.apache.struts.taglib.html.ParamTag.doEndTag(ParamTag.java:110)
	org.apache.jsp.loggedIn_jsp._jspx_meth_html_param_0(loggedIn_jsp.java:96)
	org.apache.jsp.loggedIn_jsp._jspService(loggedIn_jsp.java:68)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:298)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	org.apache.struts.chain.commands.servlet.PerformForward.handleAsForward(PerformForward.java:113)
	org.apache.struts.chain.commands.servlet.PerformForward.perform(PerformForward.java:96)
	org.apache.struts.chain.commands.AbstractPerformForward.execute(AbstractPerformForward.java:54)
	org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
	org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
	org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)
	org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
	org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
	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:717)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.25 logs.
Apache Tomcat/5.0.25

SCJP 1.5, SCWCD 1.5

David Newton

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posted 15 years ago

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The error message is telling you precisely what's wrong: the <html:param> tag is not valid outside of the tags listed in the error message. Also, your bean tag usage is missing the actual tag name; it just has the prefix.

If you're using Struts 1.3, which it appears you are, your struts-config.xml file should contain the 1.3 DTD--you're using the DTD from 1.1. (It might still work, but is confusing and misleading.)

If you're using any recent app server you no longer need to specify tag libraries in the web.xml and should avoid doing do. Your web.xml should contain an appropriate DTD/XSD. Also, if you're using a recent app server you shouldn't need the EL tags, as JSP EL is provided by the container itself.

In any case, if the attribute you're trying to display is in request scope and you're using a JSP 2+ container, just use plain old JSP EL to display the attribute: ${requestScope.userName}.

Varun Nayudu

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Posts: 160

posted 15 years ago

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David Newton wrote:The error message is telling you precisely what's wrong: the <html:param> tag is not valid outside of the tags listed in the error message. Also, your bean tag usage is missing the actual tag name; it just has the prefix.

Thanks for your reply but can you please specify which tag should i nest the <html:param > with Since i am new to struts please if you can provide me with the tag name

regards

SCJP 1.5, SCWCD 1.5

David Newton

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posted 15 years ago

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The stack trace wrote:
javax.servlet.ServletException: LinkParam tag must be nested in a Link, Rewrite, or Frame tag

Again--if you're just trying to display a scoped attribute use JSP EL.

Varun Nayudu

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posted 15 years ago

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You mean to say i should write the loggedIn.jsp
as this

SCJP 1.5, SCWCD 1.5

Varun Nayudu

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posted 15 years ago

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Please any body have any sugestions.....I am unable to display username.... with the above code

SCJP 1.5, SCWCD 1.5

David Newton

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posted 15 years ago

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Did you put the user name into the request scope?

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