It would seem that the Grails Spring Security SAML Plugin does not work with the current version of Grails - 3.3.3. So I created this project based on the jeffwills saml-plugin-test in so much of what config to use, and items in conf/security - as I did successfully use these with Grails 3.1.9.

Of note:

• I had to use Spring Security Core Plugin 3.2.1 - as I think the older 3.1.2 does not work with 3.3.x; and
• Although not in the SAML plugin instructions, I've found that I need to modify init/Application.groovy inline with what is done in saml-plugin-test - i.e. Add @EnableAutoConfiguration(exclude = [SecurityFilterAutoConfiguration])
• There is no substance to this project, just the bare bones and domain classes for Spring Security.

Steps taken to create:

1. grails create-app samltest
2. Modified build.gradle to add additional repositories and the three additional dependencies
3. ran ./grailsw s2quickstart samltest UserAcct Role
4. Copied across conf/security from other working 3.1.9 project
5. Copied across required config into conf/application.yml
6. removed conf/application.groovy
7. Modified init/Application.groovy

So with all done (as previously done for 3.1.9), things are left broken with the following occurring:

First I execute:

./grailsw run-app

And then observe:

| Running application...

Configuring Spring Security Core ...
... finished configuring Spring Security Core

Active Flag true
Configuring Spring Security SAML ...
Importing beans from classpath:security/springSecuritySamlBeans.xml...
Registering metadata key: ping and value: security/idp-local.xml
Sp File exists security/sp.xml
...finished configuring Spring Security SAML
2018-03-08 15:20:09.721 ERROR --- [           main] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'methodValidationPostProcessor' defined in class path resource [org/springframework/boot/autoconfigure/validation/ValidationAutoConfiguration.class]: Unsatisfied dependency expressed through method 'methodValidationPostProcessor' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateDatastoreServiceRegistry': Cannot resolve reference to bean 'hibernateDatastore' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateDatastore': Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.grails.orm.hibernate.HibernateDatastore]: Constructor threw exception; nested exception is java.lang.NullPointerException

Followed by much more, but you get the idea. Hibernate/GORM is unhappy.