This project contains examples related to using `gen-class` to generate

Java-style classes from within Clojure.

The

namespace defines a Clojure API for loading and resizing images. It then uses `gen-class` to produce a Java class (`ResizeImage` in the default package) whose static utility methods delegate to the API's `resize-image` function.

You can see this in action by first building an uberjar containing all

of the code in the project, and its dependencies:

Then you can choose to run either `ResizeImage` directly:

…or you can run a [Java shim class](src/ResizeClient.java) that calls

into `ResizeImage` to demonstrate that Java->Clojure interop:

The

namespace defines a custom `Exception` subclass that has a couple of interesting properties:

* a `java.util.Map` value can be provided when constructing an instance

of `CustomException`

* `CustomException` implements Clojure's `IDeref` interface, so

instances can be dereferenced (i.e. `@e`) to easily obtain the

aforementioned `java.util.Map`.

The [`BatchJob`](src/BatchJob.java) class shows an example of using this

custom `Exception` type from Java. Assuming you've built an uberjar

(`lein uberjar`), you can run `BatchJob`'s `main` method, which echos

the contents of the exception's info map: