This is project is outdated. OpenID has been diminished as a standard for sharing identity, largely supplanted by OAuth2. This old version is no longer being maintained.
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OpenID based SSO provider as a Java Servlet suitable for Tomcat or other appserver.
To build a WAR simply run:
./gradlew
Locate the war under build/libs/ssofi-provider-.war
To run with Jetty:
./gradlew jettyRun