Freemarker CSRF Error

This repository captures the minimal amount of code to demonstrate the issue in this GitHub issue: https://github.com/spring-projects/spring-boot/issues/33715.

The problem is that in SpringBoot 3 _csrf attribute injection in free marker templates no longer works.

There appears to be a workaround if spring.freemarker.expose-request-attributes=true is set, but that does not seem like a viable long term solution.

Observing SpringBoot 2 Behavior

Requires Java 17+.

1. ./gradlew sb2:bootRun
2. Visit localhost:8082/demo
3. Note the error on the browser and in the stack trace. The following has evaluated to null or missing: ==> _csrf [in template "demo.ftlh" at line 10, column 4]

Observing SpringBoot 3 Behavior

1. ./gradlew sb2:bootRun
2. Visit localhost:8083/demo
3. Note how the page loads and the fields of the _csrf attribute load correctly.