How to Exclude java.lang.* from Clojure Namespace Imports

What is the correct way to exclude java.lang.* from a Clojure namespace?

(ns my-namespace
  (:require [clojure.core :refer :exclude [* *1 *2 ...]]))

In Clojure, the default behavior of the namespace is to automatically include the classes found in the java.lang package. However, when you want to create a namespace that avoids conflicting with the default imports from java.lang, here's how to effectively exclude it from your namespace declaration.

(ns your.namespace
  (:require [clojure.core :refer :exclude [String Math Thread]]))

Causes

• Automatic imports from java.lang can lead to conflicts or ambiguity when using common names like `String`, `Math`, or `Thread`.

Solutions

• Use `:require` to selectively import only the necessary Clojure core features while excluding unwanted bindings.
• Utilize `:refer :exclude` to prevent importing specific symbols from other namespaces.

Mistake: Not specifying the correct symbols to exclude, leading to unintended shadowing of core functions.

Solution: Always refer to the documentation of the libraries you use to know the included functions.

Mistake: Excluding everything from java.lang may lead to loss of essential functionality.

Solution: Carefully assess what you actually need before broadly excluding packages.