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To understand Gang-of-Four Design Patterns in more practical application manner. 1. Very nice to understand the simple concept of each of the Design Patterns. https://www.codeproject.com/Articles/29036/Patterns-in-Real-Life 2. dzone based material to understand the purpose and use cases along with Java code. https://dzone.com/articles/gof-design-patterns-using-java-part-1 https://dzone.com/articles/gof-design-patterns-using-java-02

1. To understand Java Factory Design Pattern very basic with and without of Dependency Injection . 2. For understanding in more detail with a unit test and maven deployment of Guice, Factory pattern . In both of these cases Factory pattern is explained with Guice Dependency Injection model.

1. JAX-RS filters and interceptors youtube lesson from javabrains 2. Filters and Interceptors explanation from makeinjava