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MichaelAlanDawson
Inspiring
March 10, 2022
Answered

CF2021 custom tags do not support null values

  • March 10, 2022
  • 2 replies
  • 603 views

x = null

if (x != null) {}

 

Both of these statments fail when used in a custom tag.  Both statements succeed when using in the requested template or a template that is included in another template.

 

This issue occurs when using tag or script syntax.

 

Can anyone else reproduce this issue?

 

Version: 2021,0,03,329779

 

Message: Variable NULL is undefined. 

Stack Trace: coldfusion.runtime.UndefinedVariableException: Variable NULL is undefined. at coldfusion.runtime.CfJspPage._get(CfJspPage.java:462) at coldfusion.runtime.CfJspPage._get(CfJspPage.java:417) at coldfusion.runtime.CfJspPage._get(CfJspPage.java:396) at coldfusion.runtime.CfJspPage._autoscalarize(CfJspPage.java:2363) at cfrendercourse2ecfm589117369.runPage(C:\home\evansville.edu\custom-tags\course\rendercourse.cfm:2) at coldfusion.runtime.CfJspPage.invoke(CfJspPage.java:257) at coldfusion.filter.CFVariablesScopeFilter.invoke(CFVariablesScopeFilter.java:56) at coldfusion.tagext.lang.ModuleTag.doStartTag(ModuleTag.java:330) at coldfusion.runtime.CfJspPage._emptyTcfTag(CfJspPage.java:5201) at cfcourses2ecfm1575386829.runPage(C:\home\evansville.edu\wwwroot\majors\chemistry\courses.cfm:109) at coldfusion.runtime.CfJspPage.invoke(CfJspPage.java:257) at coldfusion.tagext.lang.IncludeTag.handlePageInvoke(IncludeTag.java:749) at coldfusion.tagext.lang.IncludeTag.doStartTag(IncludeTag.java:578) at coldfusion.filter.CfincludeFilter.invoke(CfincludeFilter.java:65) at coldfusion.filter.ApplicationFilter.invoke(ApplicationFilter.java:573) at coldfusion.filter.RequestMonitorFilter.invoke(RequestMonitorFilter.java:43) at coldfusion.filter.MonitoringFilter.invoke(MonitoringFilter.java:40) at coldfusion.filter.PathFilter.invoke(PathFilter.java:162) at coldfusion.filter.IpFilter.invoke(IpFilter.java:45) at coldfusion.filter.ExceptionFilter.invoke(ExceptionFilter.java:97) at coldfusion.filter.ClientScopePersistenceFilter.invoke(ClientScopePersistenceFilter.java:28) at coldfusion.filter.BrowserFilter.invoke(BrowserFilter.java:38) at coldfusion.filter.NoCacheFilter.invoke(NoCacheFilter.java:60) at coldfusion.filter.GlobalsFilter.invoke(GlobalsFilter.java:38) at coldfusion.filter.DatasourceFilter.invoke(DatasourceFilter.java:22) at coldfusion.filter.CachingFilter.invoke(CachingFilter.java:62) at coldfusion.CfmServlet.service(CfmServlet.java:231) at coldfusion.bootstrap.BootstrapServlet.service(BootstrapServlet.java:311) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:228) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) at coldfusion.monitor.event.MonitoringServletFilter.doFilter(MonitoringServletFilter.java:46) at coldfusion.bootstrap.BootstrapFilter.doFilter(BootstrapFilter.java:47) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:373) at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:462) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1723) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:834) 

    This topic has been closed for replies.
    Correct answer MichaelAlanDawson

    It was a .cfm file.

    I was able to confirm the issue again today.  I reported it in Adobe's bug tracker.

    Thanks!

    2 replies

    B
    bennadel22497347
    Participating Frequently
    March 16, 2022

    This may be a silly question, but I believe that null support is a setting you have to enable. Did you enable it? If so, is it enabled at the server level? Or, in the `Application.cfc`?

      M
      MichaelAlanDawsonAuthor
      Inspiring
      March 17, 2022

      Yes, null support is enabled in Application.cfc.

       

      Null-related code works everywhere except within a custom tag.  This is a bummer because my custom tags are exactly where I want to use nulls.  For example, I need to check for a non-null value from a nullable column.

       

      This code works in an "included" template:

      <cfif articles.story != null>#articles.story#</cfif>

      However, it does not work when that template is called as a custom tag.

       

      Thanks for asking!

       

      BKBK
      Community Expert
      BKBKCommunity Expert
      Community Expert
      March 17, 2022

      You could, while this is being investigated, use

      JavaCast("null","")

      as null value.

      BKBK
      Community Expert
      BKBKCommunity Expert
      Community Expert
      March 15, 2022

      I tested both statements

      • in a requested CFMtemplate
      • in a template that is included in another template.

      The code failed in both situations. The error was "Variable NULL is undefined". I, too, am on Coldfusion 2021 Update 3.

       

      Did you mistakenly test with a non-CFM page?

       

       

      M
      MichaelAlanDawsonAuthorCorrect answer
      Inspiring
      March 17, 2022

      It was a .cfm file.

      I was able to confirm the issue again today.  I reported it in Adobe's bug tracker.

      Thanks!

      BKBK
      Community Expert
      BKBKCommunity Expert
      Community Expert
      March 18, 2022

      The bug ticket: https://tracker.adobe.com/#/view/CF-4212885 

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