class CyclomaticComplexity { // Cyclomatic Complexity = 11 int a, b, c, d, n; public void foo() { // 1, function declaration if (a == 1) { // 2, if fun1(); } else if (a == b // 3, if && a == c) { // 4, && operator if (c == 2) { // 5, if fun2(); } } else if (a == d) { // 6, if try { fun4(); } catch (Exception e) { // 7, catch } } else { switch(n) { case 1: // 8, case fun1(); break; case 2: // 9, case fun2(); break; case 3: // 10, case fun3(); break; … Every method in your application gets a Cyclomatic Complexity count of 1, and hence if you have 20 simple methods in your application – you have already reached the threshold of 20! Total of points accumulated due to the violation of Checkstyle Method Length rule. When I look at the details, I have few classes with CC value of 5,4,3. The possible associated technical debts are: Understandability, Maintainability and Single Responsibility Principle violation. Get Answer. A McCabe complexity under 5 is good, from 5-10 is OK, Enter your email address to follow this blog and receive notifications of new posts by email. Flow complexity in methods. The problem is all my projects started throwing a Warning because of Cyclomatic Complexity. If the code changes does not meet quality standards, the code check-in is rejected. Can be calculated on any non-abstract operation. Please see the last screenshot in this article for the tags/filters you  want to use to get these rules. or has low cohesion (does to many different things). more... What’s New. This provides developers an early feedback of their code changes. Many developers would have scratched their heads in order to keep their Cyclomatic complexity under 10. into two highly cohesive, well-named, methods. Cyclomatic Complexity metric seems to have multiple issues. size and cylclomatic complexity of each method. Sonar reports 13 whereas 10 is expected. Add private methods with meaningful names… Option includeJavaLang: Also include classes from the package java.lang; Cyclomatic Complexity (CYCLO) Operation metric. We want to handle the complexity issues at a method level and not at the overall application level. 5. Post was not sent - check your email addresses! I have Java Bean classes with equals and hashCode code-generated by my IDE. My project is throwing a warning since Cyclomatic Complexity>20. This article describes refactoring a switch statement in order to reduce Cyclomatic complexity. I am sure nothing harm in leaving this method as it is, however, just challenging me how to go about obeying Sonar's rule.   I also wanted to check if there a way in which this metric can be looked up at a Method level? Here the cyclomatic complexity will be as follows Cyclomatic Complexity = if for case1+if for case2+else+1=4 Cyclomatic complexity has more significance on the field of testing and … Complex code may perform poorly and can be difficult to test thoroughly. Teams will be able to see the exact methods for which the code smell for complexity is being thrown. T… I think the Cyclomatic Complexity metric should be working on a Method level and not on a Project level to be more effective. How do you simplify a method? Draw the flowchart or a graph diagram from the code. This is not something we would like to throw a warning on. Thomas J. McCabe’s Cyclomatic Complexity has long been the de facto standard for measuring the complexity of a method’s control flow. Add one point for any additional boolean condition, such as the use of && or ||. With this change, SonarQube will raise a code smell when an individual method complexity is greater than 15. 1. In our SonarQube Quality Gate, we have added the Cyclomatic Complexity metric to throw a ‘warning’ if it is greater than 20 and ‘error’ if it is greater than 1000. A high flow complexity may Not sure how to go about this method to reduce Cyclomatic Complexity. Exceptions In the following, code complexity per method is 2.0 and per class is 12.9. In this blog, we will look at an issue with using Cyclomatic Complexity metric which we bumped into earlier this week and the action plan for resolution. Tool Latest release Free software Cyclomatic Complexity Number Duplicate code Notes Apache Yetus: A collection of build and release tools. This metric is nice to have since it identifies the classes which have too much of business logic going on – and probably are good candidate to be broken down and even rigorously unit tested. Flow of a software metric used to measure the Complexity of the method ‘ Single Responsibility Principle violation defined. 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