Forbidden API rules =================== Uwe's excellent forbidden API checker is applied as part of 'check' task. The rules for each project are sourced dynamically based on the actual set of dependencies. If a given project has a dependency on an artifact called "foo.bar:baz" then all of these rule files will be applied (all paths relative to: gradle/validation/forbidden-apis/). defaults.all.txt defaults.[project].txt foo.bar.baz.all.txt foo.bar.baz.[project].txt Note that the "defaults" can't reference any JARs other than Java's runtime. Example ------- We'd like to prevent people from using Guava's com.google.common.base.Charsets class. The rule would be: @defaultMessage Use java.nio.charset.StandardCharsets instead com.google.common.base.Charsets and we would place this rule in this file: gradle/validation/forbidden-apis/com.google.guava.guava.all.txt From now on, if *any* module depends on this library, it will automatically pick up the rule and enforce it.