Awesome

javadoc-lookup

This package provides a javadoc-lookup function for quickly looking up Javadoc for any library from within Emacs, optionally integrating with Maven. A browser is launched to view the documentation.

javadoc-lookup is not bound to any key by default, so you may want to add this to your initialization file,

(global-set-key (kbd "C-h j") 'javadoc-lookup)

An index for the core Java classes (i.e. java.*) is provided built-in. Beyond this, you'll want to tell javadoc-lookup what else you would like to have indexed. There are two ways to do this. You can point it to the root of a library's documentation on your filesystem. For example (the first entry here will replace the built-in index),

(javadoc-add-roots "/usr/share/doc/openjdk-8-jdk/api"
                   "~/src/project/doc")

Or, more conveniently, you can fetch and index documentation from Maven! This is done by specifying an artifact as a sequence of three strings/symbols: [groupId artifactId version]. For example,

(javadoc-add-artifacts [org.lwjgl.lwjg lwjgl "2.8.2"]
                       [com.nullprogram native-guide "0.2"]
                       [org.apache.commons commons-math3 "3.0"])

This feature requires that you have Maven and the command-line unzip utility installed on your system. The initial fetch is slow but Emacs will operate from its own cache after that.

Import functions

Two functions for managing Java imports is provided: javadoc-add-import and javadoc-sort-imports. The former integrates with the javadoc-lookup index to provide completions.

History

This package obsoletes my previous java-docs package. Use this one instead.