In this final chapter, we will review information relating to common migration issues when moving from Spring Security 3 to Spring Security 4.2. We'll spend much more time discussing the differences between Spring Security 3 and Spring Security 4, because this is what most users will struggle with. This is due to the fact that the updates from Spring Security 3 to Spring Security 4.2 contain a lot of non-passive refactoring.
At the end of the chapter, we will also highlight some of the new features that can be found in Spring Security 4.2. However, we do not explicitly cover changes from Spring Security 3 to Spring Security 4.2. This is because by explaining the differences between Spring Security 3 and Spring Security 4, users should be able to update to Spring Security 4.2 with ease since the changes to Spring Security 4.2 are passive.
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