It is well-known that APIs can be hard to learn and use. Although search tools can help find related code examples, API novices still face other significant challenges such as evaluating the relevance of the search results. To help address the broad problems of finding, understanding, and debugging API-based solutions, we have built a critic system that offers recommendations, explanations, and criticisms for API client code. Our critic takes API usage rules as input, performs symbolic execution to check that the client code has followed these rules properly, and generates advice as output to help improve the client code. We demonstrate our critic by applying it to a real-world example derived from the Java Swing Forum.
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