Why is the file I uploaded locked by ColdFusion 10? - coldfusion

Question

I'm trying to delete the file if not a spreadsheet, but keep getting the following error when I uploaded testFile.text:
ColdFusion could not delete the file D:\ColdFusion10\cfusion\runtime\work\Catalina\localhost\tmp\testFile.text
I verified its not a permission issue, because if I go back and execute the code to try to delete the file again, it will work.
<cffile action="upload" destination="#dest#" filefield="xlsfile" result="upload" nameconflict="makeunique">
<cfif upload.fileWasSaved>
<cfset theFile = dest & upload.serverFile>
<cfif isSpreadsheetFile(theFile)>
<cfspreadsheet action="read" src="#theFile#" query="data" headerrow="1">
<cfset showForm = false>
<cfelse>
<cfscript>
thisFile = theFile;
fileRead = createObject("java", "java.io.FileInputStream");
thisThread = CreateObject("java", "java.lang.Thread");
loopCT = 1;
while(1 EQ 1)
{
try
{
fileRead.init(thisFile);
break;
}
catch(any ecpt)
{
thisThread.sleep(1000);
}
incrementValue(loopCT);
if(loopCT GT 60)
{
fileRead.close();
return;
}
}
loopCT = 1;
while(1 EQ 1)
{
sizeA = fileRead.available();
thisThread.sleep(1000);
sizeB = fileRead.available();
if(sizeA EQ sizeB)
{
thisThread.sleep(1000);
sizeC = fileRead.available();
if(sizeC EQ sizeB)
{
break;
}
}
incrementValue(loopCT);
if(loopCT GT 60)
{
fileRead.close();
return;
}
}
fileRead.close();
<script type="text/javascript">
</script>
</cfscript>
<!--cffile action="delete" file="#theFile#"-->
<cfset errors = "The file was not an Excel file.">
<span style="font-size:medium;font-weight:bold; color:red"><p>The file was not an excel file!<p></span>
<input type="button" value="TRY AGAIN" class="button" onClick="window.location='bulk_upload.cfm'">
<br><br><br>
</cfif>
<cfset errors = "The file was not properly uploaded.">
</cfif>

Answer 1

I ran into the exact same issue with regards to cfimage locking the file and preventing deletion. The solution I came up with follows. Maybe someone can adapt to their situation:
<cflock name="[lockName]" timeout="5" >
<cfcache action="flush">
<!---[] Replace cfimage read function (CF BUG work around) --->
<cfscript>
imageObj = createObject( "java", "java.awt.Toolkit" );
imagetools = imageObj.getDefaultToolkit();
objImage = imagetools.getImage( "#fullpath#" );
<!---Whatever image I need from the image, or file...--->
<!---such as ---- myImageStruct["width"] = objImage.getWidth();--->
<!--- and then flush the object--->
objImage.flush();
</cfscript>
</cflock>