From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Pankaj Jangid Newsgroups: gmane.emacs.help Subject: Re: java anyone? Date: Sun, 18 Jul 2021 16:56:45 +0530 Message-ID: References: <1244C95E-DD3D-4022-AAF8-54BEBA49C49C@traduction-libre.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="12185"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (darwin) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:/EDZ6bCEvDN1crxIIMc6WmO/yGA= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Jul 18 13:27:19 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1m54x5-00032a-Ch for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 18 Jul 2021 13:27:19 +0200 Original-Received: from localhost ([::1]:36718 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m54x4-0001nu-FD for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 18 Jul 2021 07:27:18 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:35224) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m54wl-0001nW-Iz for help-gnu-emacs@gnu.org; Sun, 18 Jul 2021 07:26:59 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:54094) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m54wk-0001Qm-6V for help-gnu-emacs@gnu.org; Sun, 18 Jul 2021 07:26:59 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1m54wi-0002aY-Hw for help-gnu-emacs@gnu.org; Sun, 18 Jul 2021 13:26:56 +0200 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:131823 Archived-At: Jean-Christophe Helary writes: > I need something where I can just lookup functions in a code base with > a local javadoc tree, including online Oracle documentation, etc. Not > a full-fledged IDE with completion. I use a very lightweight language server facilitator, named Eglot. There are a couple of settings that are required for this to work. This is the minimal set that I came-up with after discussing in and following the Eglot tracker. 1. Tell Emacs the value of JAVA_HOME. ‘(setenv "JAVA_HOME" ...)’ 2. By default, Eglot uses, Eclipse JDT Language server so you need to install it somewhere. I simply pulled the git repository at ~/.emacs.d/eclipse.jdt.ls. After building the Eclipse JDT LS (‘mvn clean; mvn package’), you must add the language server JAR to the CLASSPATH. I use the following snippet: --8<---------------cut here---------------start------------->8--- (defun add-to-classpath (item) "Add ITEM to CLASSPATH." (let ((class-path (getenv "CLASSPATH"))) (defvar class-path-list (if class-path (split-string class-path ":"))) (cl-pushnew item class-path-list) (setenv "CLASSPATH" (mapconcat 'identity class-path-list ":")))) (add-to-classpath (substring (shell-command-to-string (format "find %s -name 'org.eclipse.equinox.launcher_*jar'" (expand-file-name "eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/plugins" user-emacs-directory))) 0 -1)) --8<---------------cut here---------------end--------------->8--- Eglot works with project.el, xref.el, eldoc.el etc. So many usual things will work out of the box. Like online help when the point is inside a function name. It also works with company; but that is not required.