Why Java EE standards?

One of the principles of Java EE is to provide a productive enterprise API. As seen in the Concepts and design principles of modern Java EE section in the previous chapter, one of the biggest advantages is the ability to integrate different standards without developer-side configuration required. The Java EE umbrella requires the different standards to work well together. The enterprise container has to meet this requirement. The software engineers only develop against the APIs and let the application server do the hard integration work.

Following the convention over configuration approach, using different, integrated standards that are part of the umbrella specification doesn't require initial configuration. As seen in various examples previously, the technologies that have emerged from different standards within Java EE work well with each other. We have seen examples such as using JSON-B to automatically map objects to JSON in JAX-RS resources; integrating Bean Validation...