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Setting attributes in Tag files

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posted 14 years ago

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Hello,

Please find below the tag file and the corresponding jsp that invokes the tag.

Tag File:test.tag

<%@ attribute name="Country" required="true"%>
<%
java.util.Map map = new java.util.HashMap();
map.put("countryName", "India");
request.setAttribute("map", map);
%>

<c:set target="${map}" property="countryName" value="${Country}"/>

and the jsp snippet: TagFileTest.jsp

.......
<body>
<mytags:test Country="United States">
This is a test
</mytags:test>
</body>
....

whenever I try to invoke the above jsp page I always receive the following exception:

org.apache.jasper.JasperException: /TagFileTest.jsp(12,1) Unable to find setter method for attribute: Country.

Please let me know how I may set the value for Country to get around this exception.

Ken Sampson

Ben Souther

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posted 14 years ago

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I just tried your code and saw the same thing.
Changing the attribute name from "Country" to "country" fixed it.

I'm not sure why.
I just browsed the JSP spec quickly and didn't see anything stating that attribute names need to follow bean naming conventions. It might be in there somewhere but, at a glance, I didn't see it.

To a Java developer, "Country" wouldn't be a good variable name so there is a good chance that most of us will never run into this issue.
[ March 29, 2008: Message edited by: Ben Souther ]

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Ben Souther

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posted 14 years ago

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Also, I'm not sure if you just forgot to include it or if it's really missing from your code but you don't have a tag declaration in your JSP.

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Ben Souther

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posted 14 years ago

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Also, your tag has no code to deal with the tag body so the text in your JSP isn't going to be shown.
Maybe you meant

to be

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Ken Sampson

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posted 14 years ago

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Thanks a lot Ben. This got fixed when changed from Country to country.

I tried to retrieve the attribute in the tag file in the following way:

<c:set target="${map}" property="countryName" value="${country}" />
<br />
Country Name is
<c:out value="${map.countryName}" />

But suppose, I wanted to retrieve in the following way:
<c:out value="${map["countryName"]}"

When I try the same I receive the following error:

org.apache.jasper.JasperException: /WEB-INF/tags/test.tag(19,33) equal symbol expected

Please let me know how to get around this.

Ken Sampson

Christophe Verré

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