# The Java EE 7 Tutorial

# 52 Resource Adapters and Contracts

This chapter examines resource adapters and explains how communications between Java EE servers and EIS systems are mediated by them.

The following topics are addressed here:

- What Is a Resource Adapter?

- Metadata Annotations

- Common Client Interface

- Using Resource Adapters with Contexts and Dependency Injection for Java EE (CDI)

- Further Information about Resource Adapters