Pete Freitag Pete Freitag

Iterating over an Enumeration with CFMX

Updated on November 14, 2023
By Pete Freitag

I tried writing some CFML code to iterate over a java.util.Enumeration, a fairly common thing to do in java, but was plagued with java.lang.IllegalAccessException's.

IllegalAccess exceptions usually occurr when you try to call a method using reflection (which CFMX does) that doesn't exist. However I'm quite sure that hasMoreElements() is a method of java.util.Enumeration. In fact if I cfdump the propNames variable the hasMoreElements method shows up! Here's the code I'm using:

<cfset system = CreateObject("java", "java.lang.System")>
<!--- properties is a java.util.Properties object --->
<cfset properties = system.getProperties()>

<!--- propNames is a java.util.Enumeration --->
<cfset propNames = properties.propertyNames()>

 <cfloop condition="propNames.hasMoreElements()">
	<cfset propName = propNames.nextElement()>
	#propName# = #system.getProperty(propName)#<br />

I suspect the problem has something to do with CFMX not realizing that propNames is an Enumeration, I wish that JavaCast accepted more types besides the primitives.

Here's the stack trace I'm receiving, I'm using CFMX U3:

	at java.lang.reflect.Method.invoke(Native Method)
	at coldfusion.runtime.StructBean.invoke(Unknown Source)
	at coldfusion.runtime.CfJspPage._invoke(Unknown Source)
	at Statement12.evaluate(Unknown Source)
	at coldfusion.runtime.CFPage.evaluateCondition(Unknown Source)
	at cftesta2ecfm779424527.runPage(C:\web\testa.cfm:19)
	at coldfusion.runtime.CfJspPage.invoke(Unknown Source)
	at coldfusion.tagext.lang.IncludeTag.doStartTag(Unknown Source)
	at coldfusion.filter.CfincludeFilter.invoke(Unknown Source)
	at coldfusion.filter.ApplicationFilter.invoke(Unknown Source)
	at coldfusion.filter.PathFilter.invoke(Unknown Source)
	at coldfusion.filter.LicenseFilter.invoke(Unknown Source)
	at coldfusion.filter.ExceptionFilter.invoke(Unknown Source)
	at coldfusion.filter.BrowserDebugFilter.invoke(Unknown Source)
	at coldfusion.filter.ClientScopePersistenceFilter.invoke(Unknown Source)
	at coldfusion.filter.BrowserFilter.invoke(Unknown Source)
	at coldfusion.filter.GlobalsFilter.invoke(Unknown Source)
	at coldfusion.filter.DatasourceFilter.invoke(Unknown Source)
	at coldfusion.CfmServlet.service(Unknown Source)
	at jrun.servlet.ServletInvoker.invoke(
	at jrun.servlet.JRunInvokerChain.invokeNext(
	at jrun.servlet.JRunRequestDispatcher.invoke(
	at jrun.servlet.ServletEngineService.dispatch(
	at jrun.servlet.http.WebService.invokeRunnable(
	at jrunx.scheduler.ThreadPool$DownstreamMetrics.invokeRunnable(
	at jrunx.scheduler.ThreadPool$ThreadThrottle.invokeRunnable(
	at jrunx.scheduler.ThreadPool$UpstreamMetrics.invokeRunnable(

I may end up reporting this one to Macromedia as a bug, unless I'm missing something here.

Iterating over an Enumeration with CFMX was first published on June 19, 2003.


The Fixinator Code Security Scanner for ColdFusion & CFML is an easy to use security tool that every CF developer can use. It can also easily integrate into CI for automatic scanning on every commit.

Try Fixinator

The weekly newsletter for the CFML Community


Hi Pete,

It's a CF5 and CFMX6 bug that others have also found. I know now workaround. But you can upgrade to CFMX6.1. You might still sometimes find the bug, but iterating over props.propertyNames() and props.keys() works for me.

ps = CreateObject("java", "java.util.Properties");
ps.setProperty("clau", "valor");
ps.setProperty("clau1", "valor1");
ps.setProperty("clau2", "valor2");
ps.setProperty("clau3", "valor3");

// funciona en CFMX6.1
keys = ps.keys();
while (keys.hasMoreElements()){
k = keys.nextElement();
v = ps.getProperty(k);
WriteOutput(k & " = " & v & "<br/>");
by Alexander Bunkenburg on 02/04/2004 at 10:59:47 AM UTC
This code now works as of CFMX 6.1
by Pete Freitag on 10/29/2004 at 2:56:48 PM UTC