This is a CLI for Revapi. Revapi has 2 intended audiences - library authors who would like to make sure they don’t break their users' codebase unintentionally, but also library users that want to make sure that upgrading a library won’t break their code. The first group of users is best served by the Revapi’s maven plugin, while the second group can leverage this CLI tool.
The tool can be used to compare the API changes in two pairs of archives. Both old and new version of the API consist of the set of the API archives and another set of "supplementary" archives - which are supposed to complement the API - basically these are the dependencies of the API archives.
Revapi standalone CLI can be either supplied with the JAR files of the archives to compare or it can be told their Maven coordinates and it will download the archives and figure out its dependencies on its own.
Because Revapi is all based around extensions, the invocation must include the set of extensions to be used during the analysis - these are supplied using the Maven coordinates of the extensions.
Let’s take a look at an example invocation - comparing Guava 17.0 to Guava 18.0.
First, let’s try that using the file-based approach:
--old path/to/guava-17.0.jar (2)
--new path/to/guava-18.0.jar (3)
|This is a comma-separated list of extensions to use - in here we’re using the java extension to check the API changes in the java code in the archives and a simple reporter that outputs the changes to standard output. The extensions are identified by their Maven GAVs.
|The path to the old version of the API, in our case Guava 17.0.
|The path to the new version of the API, in our case Guava 18.0.
|This is a little bit of configuration required for the API check to not fail on the missing classes. We’re not supplying any "supplementary archives", i.e. the dependencies of the Guava library and so it may happen that some classes that contribute to the API are not present in the "main" archives.
report behavior is the default as of
revapi-java extension version
Now, let’s try the same but using the maven coordinates for the guava libraries:
--old-gavs com.google.guava:guava:17.0 (2)
--new-gavs com.google.guava:guava:18.0 (3)
|The same as in the previous example, this is the list of extensions to use during the API check
|The old archive(s) specified as comma-separated list of maven coordinates
|The new archive(s) specified as comma-separated list of maven coordinates
|This is still required because some of the deps of Guava are optional and therefore not present on the classpath.
The CLI is equipped with a simple help on the available commands, just invoke it with