GlassFish vs Payara Server - Comparison
How is Payara Server better than GlassFish?
With no need for code rewrites or application re-architecting, Payara Server is a credible alternative for your Java middleware platform. Used as a drop in replacement for GlassFish Server Open Source Edition, Payara Server gives you a peace of mind of quarterly releases containing enhancements, bug fixes and patches. See the GlassFish to Payara Server Migration Guide.