Check Ant codebase against certain code style guidelines using Checkstyle, Apache Rat, SpotBugs, OWASP Dependency Check and Simian. Checkstyle uses an abstract syntax tree (AST) for doing checks against Java sources. It is available at http://checkstyle.sourceforge.net/ under GPL 2.1 license. "Apache Rat is a release audit tool, focused on licenses." It is available at https://creadur.apache.org/rat/ under Apache License, Version 2.0 "SpotBugs is a program which uses static analysis to look for bugs in Java code." It is available at https://spotbugs.github.io/ under LGPL 3 license. "Dependency-Check is a utility that identifies project dependencies and checks if there are any known, publicly disclosed, vulnerabilities." It is available at https://www.owasp.org/index.php/OWASP_Dependency_Check under Apache License, Version 2.0 "Simian (Similarity Analyser) identifies duplication in Java, C#, C, CPP, COBOL, Ruby, JSP, ASP, HTML, XML, Visual Basic, Groovy source code and even plain text files." It is available at https://www.harukizaemon.com/simian/ and is for free use in open source projects. See external task page and homepages for more information. Found antlr on the classpath. Having a wrong antlr version on the same classpath as Checkstyle may produce errors like 'Can't find/access AST Node typecom.puppycrawl.tools.checkstyle.api.DetailAST' Skip running Checkstyle. ${report} Install Simian ${simian.version} Run Simian