SpringBoot Invalid reference to RequestParameters in Freemarker after upgrade

I just upgraded my app to Spring Boot 3.0.5 and there seems to be something broken with spring-boot-starter-freemarker.

In my Freemarker template, I have this line that used to work before the upgrade:

<div>${RequestParameters.myParam!}</div>

After the upgrade, I get this error when loading the template:

freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:
==> RequestParameters  [in template "template.ftlh" at line 136, column 11]

----
Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----

----
FTL stack trace ("~" means nesting-related):
    - Failed at: ${RequestParameters.myParam!}  [in template "template.ftlh" at line 136, column 9]

It seems like RequestParameters is not available anymore.

Is there a fix in sight for this? Any workarounds?

Thanks!

Comment From: wilkinsona

Which version of Spring Boot were you using before the upgrade?

As far as I can remember, we haven't made many, if any, recent changes to our FreeMarker support. Once possibility is this change in Spring Framework.

Comment From: anabright

I upgraded from 2.7.10. If I go back to it, it works again. Not sure if the issue you linked is the cause, it doesn't seem to mention any changes to the availability of RequestParameters

Comment From: wilkinsona

Sorry, I should have linked more precisely. I meant the change that I described in https://github.com/spring-projects/spring-framework/issues/29787#issuecomment-1375508371. Due to https://github.com/spring-projects/spring-framework/commit/d84ca2ba90d27a7c63d7b35a6259b5b9cf341118, there's no longer a RequestParameters entry in the model. Can you please open a Spring Framework issue and comment here with a link to it?

Comment From: startjava

use spring-boot 3.1.2

use url： http://localhost:8080/test20?selectedValue=d

template code： <#if listString?? && listString?size!=0> <#list listString as list> <#if RequestParameters['selectedValue']==list> ${list} </#if> <#if RequestParameters['selectedValue']!=list> ${list} </#if> </#list> </#if>

controller code： @RequestMapping("test20") public String test20(Model model,HttpServletRequest request,HttpServletResponse response)

{ List listString=new ArrayList(); listString.add("a"); listString.add("b"); listString.add("c"); listString.add("d"); listString.add("e"); request.setAttribute("listString",listString); return "test20"; }

run result ： freemarker.core.InvalidReferenceException: The following has evaluated to null or missing: ==> RequestParameters [in template "test20.ftlh" at line 12, column 12]

Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??

FTL stack trace ("~" means nesting-related): - Failed at: #if RequestParameters.selectedValue =...

[in template "test20.ftlh" at line 12, column 7]

@wilkinsona same question！

Comment From: startjava

@anabright

Comment From: startjava

https://github.com/spring-projects/spring-framework/issues/30186

Comment From: wilkinsona

@startjava please stop making the same comments across multiple issues

Comment From: doctore

I had this problem upgrading an old project from Spring 3 to Spring 6, by now we have no time to replace the technology used to render the views, so my solution was adding it as a new model attribute of FreeMarker.

Replacing:

<#if RequestParameters['authfail']??>
  ...
</#if>

By, in backend:

@ModelAttribute("rawRequestParameters") 
public String getRequestParameters(HttpServletRequest request) {
  return ofNullable(request)
            .map(HttpServletRequest::getQueryString)
            .orElse("");
}

and in frontend:

<#if rawRequestParameters?? && rawRequestParameters == "authfail">
  ...
</#if>