value for useBean class is invalid

Imran Vohra

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posted 17 years ago

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This is my HTML

<HTML>
<HEAD>
<TITLE> New Document </TITLE>
</HEAD>
<BODY>
<form action="TestBean.jsp">
Name : <input type="text" name="userName">
User ID: <input type="text" name="userID">
<input type="submit">
</form>
</BODY>
</HTML>

TestBean.jsp is like this
<jsp:useBean id="person" type="foo.Person" class="foo.Employee"/>
<% pseron.setName(request.getParameter("userName")); %>

I have also created foo.Person & foo.employee and put them in classes folder.
but I am getting an exception like this org.apache.jasper.JasperException: /TestBean.jsp(1,1) The value for the useBean class attribute foo.Employee is invalid.

Thanks

Regards
Imran

Jan Kostelansky

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posted 17 years ago

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It is not possible to mix scope attributes and method variables.
If a variable is created in scriptlet, it is transformed into regular variable in jsp service method and it is accessible in another scriptlets on the same jsp page.
If a variable is created in jsp declaration, it is transformed into regular instance variable in jsp object and it is accessible in another scriptlets on the same jsp page.
However jsp:useBean standard action does not create variable, it creates attribute in scope defined in scope element.

If you want top use standard action use jsp:setProperty standard action to set property for a bean
If you want to use scriptlets create variable in scriptlet as well

Jan

Narendra Dhande

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posted 17 years ago

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Hi,

<% pseron.setName(request.getParameter("userName")); %>

is the valid code to set the bean attribute. When the useBean is encountered, it create a attribute in given scope as well as create a scripting variable in the current scope ( Java method, {} etc scope) that is if you are not enclosing the useBean in <%{ %> useBean.. <%}%>. The variable with the same name as id of useBean is created in _jspService method.

The above example, I think the error is not do to this statement. Possibility that the Employee class is not subclss of Person class, so the compiler does not accepting it as class attribute.

Thanks

Narendra Dhande
SCJP 1.4,SCWCD 1.4, SCBCD 5.0, SCDJWS 5.0, SCEA 5.0

Imran Vohra

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posted 17 years ago

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I didnt get u totally. But you can store request parameters in bean properties. And this example is given in HFSJ.

Thanks

Regards
Imran

Sandeep Singh Kunwar

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posted 17 years ago

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I have also created foo.Person & foo.employee and put them in classes folder.
but I am getting an exception like this org.apache.jasper.JasperException: /TestBean.jsp(1,1) The value for the useBean class attribute foo.Employee is invalid.

class foo.employee extends foo.person // this should be class structure and
i think another reason may be
person.setName(String name) // argument must be string

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