CDI (Contexts and Dependency Injection) is the Jave EE standard (JSR-299) for handling dependency injection. In addition to dependency injection, the standard encompasses component lifecycle, application configuration, call-interception and a decoupled, type-safe eventing specification.
The Errai CDI extension implements a subset of the specification for use inside of client-side applications within Errai, as well as additional capabilities such as distributed eventing.
Errai CDI does not currently implement all life cycles specified in JSR-299 or interceptors. These deficiencies may be addressed in future versions.
|Errai CDI is implemented as an extension on top of the Errai IOC Framework (see Dependency Injection), which itself implements JSR-330. Inclusion of the CDI module your GWT project will result in the extensions automatically being loaded and made available to your application.|
|Classpath Scanning and ErraiApp.properties|
Errai CDI only scans the contents of classpath locations (JARs and directories) that have a file called ErraiApp.properties at their root. If CDI features such as dependency injection, event observation, and @PostConstruct are not working for your classes, double-check that you have an ErraiApp.properties at the root of every JAR and directory tree that contains classes Errai should know about.