tomcat-taglibs-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Shawn Bayern <bay...@essentially.net>
Subject Re: "evaluating custom action attribute" Error
Date Fri, 02 Aug 2002 18:37:21 GMT
The error you're experiencing is probably the result of an exception that
was thrown in the getBlocks() method.  The error message does say, "An
error occurred"; this is different from "Class XXX does not have property
YYY."

-- 
Shawn Bayern
"JSTL in Action"   http://www.jstlbook.com

On Fri, 2 Aug 2002, Vernon Wu wrote:

> Shawn,
> 
> Thanks for clarifying the concept betwennt attribute and property.
> 
> Please read below for the problem.
> 
> >> But when I use ${agentHelper.blocks} where the "blocks" is not an
> >> attribute, I get an error message as:
> >> 
> >> An error occurred while evaluating custom action attribute "value"
> >> with value "${agentHelper.blocks}": An error occurred while getting
> >> property "blocks" from an instance of class ....
> >> 
> >It means that no "blocks" property was found -- either that no getBlocks()
> >method was found, the getBlocks() method was unsuitable for another reason
> >(e.g., accepting an argument, or having a setBlocks() method that doesn't
> >correspond to it in data type), or a BeanInfo overrides it.
> 
> There is a method. getBlocks() in the class without taking any argument, but not "set"
method. I don't see anything 
> wrong. Here is the related code:
> 
> public class MatchAgentHelper implements Serializable {
> 
>   	static private DBConnectionPool conn;
> 	private String hostID;
> 
>     	private MatchAgentDAO dao;
> 
>     	private int count = 2;
>     	private int start = 0;
> 
> 	/**
> 	 * Constructor for MatchAgentHelper.
> 	 */
> 	public MatchAgentHelper() {
> 		super();
> 	}
> 
> 	public MatchAgentHelper(DBConnectionPool conn) throws MatchAgentDAOSysException{
> 		if(this.conn == null)
> 			this.conn = conn;
> 		dao = new MatchAgentDAOImpl(conn);
> 	}
> 
>     	public void setCount(String countString) {
>        		 this.count = (new Integer(countString)).intValue();
>     	}
> 
>     	public void setStart(String startString) {
>         		if (startString != null) {
>             			this.start = (new Integer(startString)).intValue();
>         		} else {
>             			start = 0;
>         		}
>     	}
> 
> 	public void sethostID(String id) {
> 		this.hostID = id;
> 	}
> 		
> 	public Page getBlocks() throws MatchAgentException {
> 		return getBlocksFromDAO(hostID, start, count, "");
> 	}
> 	
> 	private Page getBlocksFromDAO(String Id, int start, int count, String localeString)
>         		throws MatchAgentException {
>          		Locale locale = getLocaleFromString(localeString);
> 		return dao.getBlocks(Id, start, count, locale);
>     	}
>     
>     	private Locale getLocaleFromString(String localeString) {
>     		//...
>     	}
> }
> 
> And the followings is the related JSP page code:
> 
> <%@ taglib prefix="c" uri="/WEB-INF/tlds/c.tld" %>
> <%@ taglib prefix="fmt" uri="/WEB-INF/tlds/fmt.tld" %>
> 
> 
> <jsp:useBean
>   id="agentHelper"
>   class="com.vernonwu.mm.web.client.MatchAgentHelper"
>   scope="session"
> />
> <c:choose>
>  <c:when test="${param.count != null}">
>   <c:set value="${param.start}" target="${agentHelper}" property="start"/>
>   <c:set value="${param.count}" target="${agentHelper}" property="count"/>
>  </c:when>
>  <c:otherwise>
>   <c:set value="0" target="${agentHelper}" property="start"/>
>   <c:set value="2" target="${agentHelper}" property="count"/>
>  </c:otherwise>
> </c:choose>
> 
> <c:set value="${param.id}" target="${agentHelper}" property="hostID"/>
> <c:set value="${agentHelper.blocks}" var="pageResults" />
>  
> 
> Thank for your help.
> 
> Vernon
> 
> 
> 
> 
> --
> To unsubscribe, e-mail:   <mailto:taglibs-user-unsubscribe@jakarta.apache.org>
> For additional commands, e-mail: <mailto:taglibs-user-help@jakarta.apache.org>
> 


--
To unsubscribe, e-mail:   <mailto:taglibs-user-unsubscribe@jakarta.apache.org>
For additional commands, e-mail: <mailto:taglibs-user-help@jakarta.apache.org>


Mime
View raw message