Problems with SAML2 samples

I'm having problems trying to run these two SAML2 samples:

• https://github.com/spring-projects/spring-security-samples/tree/main/servlet/java-configuration/saml2/login
• https://github.com/spring-projects/spring-security-samples/tree/main/servlet/spring-boot/java/saml2/login

The Gradle command line in the READMEs doesn't work. I figured out what I think are the right tasks to invoke:

• :servlet:java-configuration:saml2:login:appStart for the first of the above samples, and
• :servlet:spring-boot:java:saml2:login:bootRun for the second of the above samples.

For the first sample, Tomcat seems to come up but the webapp doesn't seem to be loaded. Going to http://localhost:8080 produces a generic Tomcat 404 page.

For the second sample, Tomcat and the webapp do come up. I'd like to be able to attach a debugger to it though and there doesn't seem to be a simple way to do that. (For the first sample, if it worked, I think I could use the ...:appStartDebug task to make it debuggable.)

Start with the READMEs in the two linked SAML2 sample directories and run the reported Gradle tasks: appStart and bootRun. Verify why the first sample serves Tomcat's 404 page and determine how the second sample can be started with debugger attachment. Done means the README commands work, the first webapp loads, and the second supports straightforward debugging.