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From Vernon Wu <vern...@gatewaytech.com>
Subject Re: "evaluating custom action attribute" Error
Date Fri, 02 Aug 2002 16:22:28 GMT

You are exactly right, Shawn. It is an exception caused by an invalid  SQL statement.

Thanks for pointing out the problem source.

Vernon

8/2/2002 11:37:21 AM, Shawn Bayern <bayern@essentially.net> wrote:

>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
>> 
>> 
>> 
>> 
>> --
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>> 
>
>
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>




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