Question

I have the following Applicaton.cfc

<cffunction name="onApplicationStart" access="public" returntype="Object">
 <cfset application.dsn = "myDB" />
 <cfset application.userGateway = createObject("component","cfc.UserGateway").init(dsn = application.dsn) />
 <cfreturn this />
</cffunction>

This is my component UserGateway.cfc

<cfcomponent name="UserGateway" hint="Data Access Object" output="false">
 <cffunction name="init" access="public" hint="constructor" output="false" returntype="UserGateway">
  <cfargument name="dsn" type="string" required="true" hint="datasource" />
   <cfset variables.dsn = arguments.dsn />
 <cfreturn this />
 </cffunction>

 <cffunction name="getUsers" access="public" output="false" returntype="query">
  <cfargument name="id" type="String" default="" />
  <cfargument name="name" type="String" default="" />
  <cfargument name="district" type="String" default="" />
  <cfset var qQuery = "" />
  <cfquery name="qQuery" datasource="#variables.dsn#">
    SELECT *
    FROM A INNER JOIN B
    ON A.X = B.Y
    WHERE 0=0
    <cfif "#arguments.id#" neq "">
     AND B.X LIKE '%#arguments.id#%'
    </cfif>
    <cfif "#arguments.name#" neq "">
     AND (A.I LIKE '#arguments.name#%'
      OR A.J LIKE '#arguments.name#%')
    </cfif>
    <cfif "#arguments.district#" neq "">
     AND A.O LIKE '%#arguments.district#%'
    </cfif>
  </cfquery>
  <cfreturn qQuery />
 </cffunction>
</cfcomponent>

And this is my same.cfm

<cfform action="same.cfm" method="post" preservedata="true">
 <p>ID: <cfinput type="text" name="id" size="20" maxlength="4" /></p>
 <p>Name: <cfinput type="text" name="name" size="20" maxlength="64" /></p>
 <p>District: <cfinput type="text" name="district" size="20" maxlength="3" /></p>
 <p><cfinput class="button" type="submit" name="submit" value="OK" /></p>
</cfform>

<cfif IsDefined("form.submit")>
 <table>
  <cfset qQuery = application.userGateway.getUsers(id = form.id, name = form.name, district = form.district) />
  <cfoutput query="qQuery">
   <tr>
    <td>#qQuery.currentRow#.</a></td>
    <td>#qQuery.I#</a></td>
    <td>#qQuery.M#, #qQuery.N#</a></td>
    <td>#qQuery.D#</a></td>
   </tr>
  </cfoutput>
 </table>
</cfif>

I get the following error:

Element USERGATEWAY is undefined in a Java object of type class [Ljava.lang.String;.
The error occurred in same.cfm: line 10

What am i missing?

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When i do it this way it works. it must be something trivial that i as a beginner do not get.

Application.cfc

<cffunction name="onRequestStart" access="public" returntype="String">
 <cfset request.dsn="myDB" />
</cffunction>

same.cfm

    <cfset userGateway = createObject("component","cfc.UserGateway").init(dsn = request.dsn) />
    <cfset qGetUser = userGateway.getUsers(id = form.personid, name = form.name, district = form.district) />
  <cfoutput query="qQuery">
   <tr>
    <td>#qQuery.currentRow#.</a></td>
    <td>#qQuery.I#</a></td>
    <td>#qQuery.M#, #qQuery.N#</a></td>
    <td>#qQuery.D#</a></td>
   </tr>
  </cfoutput>

Answer 1

There are two things I see wrong here:

First, To my understanding, using the ‘this’ scope in application.cfc doesn’t work the way you’re trying to do it. By setting your userGateway object to an application scoped value, it becomes globally available and really makes returning it in onApplicationStart unnecessary. In your application.cfc, change your returntype to boolean and just return true; that should fix your problem.

Second, if in your query, your arguments and conditionals are not proxies of what you actually have, you’re referencing an argument ‘personid’ which does not exist in your function. When calling that query through an object call in the application scope, I’ve seen the java string error returned as an error before as opposed to the CF Friendly ‘variable doesn’t exist’ error.