  Integrated development environments (IDE) play an important role in
supporting developers during program comprehension and completion. Many of
these supportive features focus on low-level programming and debugging
activities. Unfortunately, there is less support in understanding and
implementing architectural concerns in the form of patterns, tactics and/or
other concerns. In this paper we present ArCode, a tool designed as a plugin
for a popular IDE, IntelliJ IDEA. ArCode is able to learn correct ways of using
frameworks' API to implement architectural concerns such as Authentication and
Authorization. Analyzing the programmer's code, this tool is able to find
deviations from correct implementation and provide fix recommendations
alongside with graphical demonstrations to better communicate the
recommendations with the developers. We showcase how programmers can benefit
from ArCode by providing an API misuse detection and API recommendation
scenario for a famous Java framework, Java Authentication and Authorization
(JAAS) security framework.
