--- /dev/null
+" Author: Horacio Sanson <https://github.com/hsanson>
+" Description: Support for the Java language server https://github.com/georgewfraser/vscode-javac
+
+call ale#Set('java_javalsp_executable', '')
+call ale#Set('java_javalsp_config', {})
+
+function! ale_linters#java#javalsp#Executable(buffer) abort
+ return ale#Var(a:buffer, 'java_javalsp_executable')
+endfunction
+
+function! ale_linters#java#javalsp#Config(buffer) abort
+ let l:defaults = { 'java': { 'classPath': [], 'externalDependencies': [] } }
+ let l:config = ale#Var(a:buffer, 'java_javalsp_config')
+
+ " Ensure the config dictionary contains both classPath and
+ " externalDependencies keys to avoid a NPE crash on Java Language Server.
+ call extend(l:config, l:defaults, 'keep')
+ call extend(l:config['java'], l:defaults['java'], 'keep')
+
+ return l:config
+endfunction
+
+function! ale_linters#java#javalsp#Command(buffer) abort
+ let l:executable = ale_linters#java#javalsp#Executable(a:buffer)
+
+ if fnamemodify(l:executable, ':t') is# 'java'
+ " For backward compatibility.
+ let l:cmd = [
+ \ ale#Escape(l:executable),
+ \ '--add-exports jdk.compiler/com.sun.tools.javac.api=javacs',
+ \ '--add-exports jdk.compiler/com.sun.tools.javac.code=javacs',
+ \ '--add-exports jdk.compiler/com.sun.tools.javac.comp=javacs',
+ \ '--add-exports jdk.compiler/com.sun.tools.javac.main=javacs',
+ \ '--add-exports jdk.compiler/com.sun.tools.javac.tree=javacs',
+ \ '--add-exports jdk.compiler/com.sun.tools.javac.model=javacs',
+ \ '--add-exports jdk.compiler/com.sun.tools.javac.util=javacs',
+ \ '--add-opens jdk.compiler/com.sun.tools.javac.api=javacs',
+ \ '-m javacs/org.javacs.Main',
+ \]
+
+ return join(l:cmd, ' ')
+ else
+ return ale#Escape(l:executable)
+ endif
+endfunction
+
+call ale#linter#Define('java', {
+\ 'name': 'javalsp',
+\ 'aliases': ['java_language_server'],
+\ 'lsp': 'stdio',
+\ 'executable': function('ale_linters#java#javalsp#Executable'),
+\ 'command': function('ale_linters#java#javalsp#Command'),
+\ 'language': 'java',
+\ 'project_root': function('ale#java#FindProjectRoot'),
+\ 'lsp_config': function('ale_linters#java#javalsp#Config')
+\})