Devoxx 2013 - Nuts and Bolts of Java EE 7 Interceptors

Emmanuel Bernard

Interceptor 1.2

• update of 1.1, part of JEE7
• common rules
• used by developers and container providers (e.g. bean validation)
• AroundConstruct lifecycle
• priority ranges

Bean Validation and Interceptors

• define / declare constraints on objects
• annotation based
• extensible
• (new) validation of parameters and return values of methods
• no proprietary hook
• ordering of validators -> new @Priority

details

• @AroundConstruct -> dedicated interceptor class
• ordering of interceptors:
  • @Priority: global ordering (smaller number = first - cfr. Interceptor.Priority...)
  • or: ordering with @Interceptors list
  • @ExcludeClassInterceptors: remove interceptors defined on classlevel
• Lyfecycle: simplified method signatures for checked exceptions