Error about the getColumnDisplaySize()??

I do:

<cfquery datasource="vf" name="q">
select * from xyz where 1=2
</cfquery>

<cfloop from="1" to="#listlen(q.columnlist)#" index="i">
<cfoutput>
#q.GetMetaData().GetColumnName(JavaCast( 'int', i ))#
#q.GetMetaData().GetColumnTypeName(JavaCast( 'int', i ))#
#q.GetMetaData().getColumnDisplaySize(JavaCast('int',i ))#
<br />
</cfoutput>

the error:
java.lang.UnsupportedOperationException: getColumnDisplaySize()
at coldfusion.sql.QueryTableMetaData.getColumnDisplaySize(QueryTableMetaData.java:541)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at coldfusion.runtime.StructBean.invoke(StructBean.java:391)
at coldfusion.runtime.CfJspPage._invoke(CfJspPage.java:1662)
at cfasatest2ecfm1499774904.runPage(D:\Apache Group\Apache2\htdocs\asatest.cfm:16)
at coldfusion.runtime.CfJspPage.invoke(CfJspPage.java:152)
at coldfusion.tagext.lang.IncludeTag.doStartTag(IncludeTag.java:349)
at coldfusion.filter.CfincludeFilter.invoke(CfincludeFilter.java:65)
at coldfusion.filter.ApplicationFilter.invoke(ApplicationFilter.java:210)
at coldfusion.filter.RequestMonitorFilter.invoke(RequestMonitorFilter.java:51)
at coldfusion.filter.PathFilter.invoke(PathFilter.java:86)
at coldfusion.filter.ExceptionFilter.invoke(ExceptionFilter.java:69)
at coldfusion.filter.BrowserDebugFilter.invoke(BrowserDebugFilter.java:52)
at coldfusion.filter.ClientScopePersistenceFilter.invoke(ClientScopePersistenceFilter.java:28)
at coldfusion.filter.BrowserFilter.invoke(BrowserFilter.java:38)
at coldfusion.filter.GlobalsFilter.invoke(GlobalsFilter.java:38)
at coldfusion.filter.DatasourceFilter.invoke(DatasourceFilter.java:22)
at coldfusion.filter.RequestThrottleFilter.invoke(RequestThrottleFilter.java:115)
at coldfusion.CfmServlet.service(CfmServlet.java:107)
at coldfusion.bootstrap.BootstrapServlet.service(BootstrapServlet.java:78)
at jrun.servlet.ServletInvoker.invoke(ServletInvoker.java:91)
at jrun.servlet.JRunInvokerChain.invokeNext(JRunInvokerChain.java:42)
at jrun.servlet.JRunRequestDispatcher.invoke(JRunRequestDispatcher.java:257)
at jrun.servlet.ServletEngineService.dispatch(ServletEngineService.java:541)
at jrun.servlet.jrpp.JRunProxyService.invokeRunnable(JRunProxyService.java:204)
at jrunx.scheduler.ThreadPool$DownstreamMetrics.invokeRunnable(ThreadPool.java:318)
at jrunx.scheduler.ThreadPool$ThreadThrottle.invokeRunnable(ThreadPool.java:426)
at jrunx.scheduler.ThreadPool$UpstreamMetrics.invokeRunnable(ThreadPool.java:264)
at jrunx.scheduler.WorkerThread.run(WorkerThread.java:66)


why?and how to resolve it ?

Thanks a lot.