diff --git a/runtime/compiler/spotbugs.vim b/runtime/compiler/spotbugs.vim
new file mode 100644
index 0000000..72a5084
--- /dev/null
+++ b/runtime/compiler/spotbugs.vim
@@ -0,0 +1,189 @@
+" Vim compiler file
+" Compiler:     Spotbugs (Java static checker; needs javac compiled classes)
+" Maintainer:   @konfekt and @zzzyxwvut
+" Last Change:  2024 Nov 27
+
+if exists('g:current_compiler') || bufname() !~# '\.java\=$' || wordcount().chars < 9
+  finish
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+" Unfortunately Spotbugs does not output absolute paths, so you need to
+" pass the directory of the files being checked as `-sourcepath` parameter.
+" The regex, auxpath and glob try to include all dependent classes of the
+" current buffer. See https://github.com/spotbugs/spotbugs/issues/856
+
+" FIXME: When "search()" is used with the "e" flag, it makes no _further_
+" progress after claiming an EOL match (i.e. "\_" or "\n", but not "$").
+" XXX: Omit anonymous class declarations
+let s:keywords = '\C\<\%(\.\@1<!class\|@\=interface\|enum\|record\|package\)\%(\s\|$\)'
+let s:type_names = '\C\<\%(\.\@1<!class\|@\=interface\|enum\|record\)\s*\(\K\k*\)\>'
+" Capture ";" for counting a class file directory (see s:package_dir_heads below)
+let s:package_names = '\C\<package\s*\(\K\%(\k*\.\=\)\+;\)'
+let s:package = ''
+
+if has('syntax') && exists('g:syntax_on') && exists('b:current_syntax') &&
+    \ b:current_syntax == 'java' && hlexists('javaClassDecl')
+
+  function! s:GetDeclaredTypeNames() abort
+    if bufname() =~# '\<\%(module\|package\)-info\.java\=$'
+      return [expand('%:t:r')]
+    endif
+    defer execute('silent! normal! g``')
+    call cursor(1, 1)
+    let type_names = []
+    let lnum = search(s:keywords, 'eW')
+    while lnum > 0
+      let name_attr = synIDattr(synID(lnum, (col('.') - 1), 0), 'name')
+      if name_attr ==# 'javaClassDecl'
+        let tokens = matchlist(getline(lnum)..getline(lnum + 1), s:type_names)
+        if !empty(tokens) | call add(type_names, tokens[1]) | endif
+      elseif name_attr ==# 'javaExternal'
+        let tokens = matchlist(getline(lnum)..getline(lnum + 1), s:package_names)
+        if !empty(tokens) | let s:package = tokens[1] | endif
+      endif
+      let lnum = search(s:keywords, 'eW')
+    endwhile
+    return type_names
+  endfunction
+
+else
+  function! s:GetDeclaredTypeNames() abort
+    if bufname() =~# '\<\%(module\|package\)-info\.java\=$'
+      return [expand('%:t:r')]
+    endif
+    " Undo the unsetting of &hls, see below
+    if &hls
+      defer execute('set hls')
+    endif
+    " Possibly restore the current values for registers '"' and "y", see below
+    defer call('setreg', ['"', getreg('"'), getregtype('"')])
+    defer call('setreg', ['y', getreg('y'), getregtype('y')])
+    defer execute('silent bwipeout')
+    " Copy buffer contents for modification
+    silent %y y
+    new
+    " Apply ":help scratch-buffer" effects and match "$" in Java (generated)
+    " type names (see s:type_names)
+    setlocal iskeyword+=$ buftype=nofile bufhidden=hide noswapfile nohls
+    0put y
+    " Discard text blocks and strings
+    silent keeppatterns %s/\\\@<!"""\_.\{-}\\\@<!"""\|\\"//ge
+    silent keeppatterns %s/".*"//ge
+    " Discard comments
+    silent keeppatterns %s/\/\/.\+$//ge
+    silent keeppatterns %s/\/\*\_.\{-}\*\///ge
+    call cursor(1, 1)
+    let type_names = []
+    let lnum = search(s:keywords, 'eW')
+    while lnum > 0
+      let line = getline(lnum)
+      if line =~# '\<package\>'
+        let tokens = matchlist(line..getline(lnum + 1), s:package_names)
+        if !empty(tokens) | let s:package = tokens[1] | endif
+      else
+        let tokens = matchlist(line..getline(lnum + 1), s:type_names)
+        if !empty(tokens) | call add(type_names, tokens[1]) | endif
+      endif
+      let lnum = search(s:keywords, 'eW')
+    endwhile
+    return type_names
+  endfunction
+endif
+
+if has('win32')
+
+  function! s:GlobClassFiles(src_type_name) abort
+    return glob(a:src_type_name..'$*.class', 1, 1)
+  endfunction
+
+else
+  function! s:GlobClassFiles(src_type_name) abort
+    return glob(a:src_type_name..'\$*.class', 1, 1)
+  endfunction
+endif
+
+if exists('g:spotbugs_properties') &&
+    \ (has_key(g:spotbugs_properties, 'sourceDirPath') &&
+    \ has_key(g:spotbugs_properties, 'classDirPath')) ||
+    \ (has_key(g:spotbugs_properties, 'testSourceDirPath') &&
+    \ has_key(g:spotbugs_properties, 'testClassDirPath'))
+
+function! s:FindClassFiles(src_type_name) abort
+  let class_files = []
+  " Match pairwise the components of source and class pathnames
+  for [src_dir, bin_dir] in filter([
+            \ [get(g:spotbugs_properties, 'sourceDirPath', ''),
+                \ get(g:spotbugs_properties, 'classDirPath', '')],
+            \ [get(g:spotbugs_properties, 'testSourceDirPath', ''),
+                \ get(g:spotbugs_properties, 'testClassDirPath', '')]],
+        \ '!(empty(v:val[0]) || empty(v:val[1]))')
+    " Since only the rightmost "src" is sought, while there can be any number of
+    " such filenames, no "fnamemodify(a:src_type_name, ':p:s?src?bin?')" is used
+    let tail_idx = strridx(a:src_type_name, src_dir)
+    " No such directory or no such inner type (i.e. without "$")
+    if tail_idx < 0 | continue | endif
+    " Substitute "bin_dir" for the rightmost "src_dir"
+    let candidate_type_name = strpart(a:src_type_name, 0, tail_idx)..
+        \ bin_dir..
+        \ strpart(a:src_type_name, (tail_idx + strlen(src_dir)))
+    for candidate in insert(s:GlobClassFiles(candidate_type_name),
+            \ candidate_type_name..'.class')
+      if filereadable(candidate) | call add(class_files, shellescape(candidate)) | endif
+    endfor
+    if !empty(class_files) | break | endif
+  endfor
+  return class_files
+endfunction
+
+else
+function! s:FindClassFiles(src_type_name) abort
+  let class_files = []
+  for candidate in insert(s:GlobClassFiles(a:src_type_name),
+          \ a:src_type_name..'.class')
+    if filereadable(candidate) | call add(class_files, shellescape(candidate)) | endif
+  endfor
+  return class_files
+endfunction
+endif
+
+function! s:CollectClassFiles() abort
+  " Get a platform-independent pathname prefix, cf. "expand('%:p:h')..'/'"
+  let pathname = expand('%:p')
+  let tail_idx = strridx(pathname, expand('%:t'))
+  let src_pathname = strpart(pathname, 0, tail_idx)
+  let all_class_files = []
+  " Get all type names in the current buffer and let the filename globbing
+  " discover inner type names from arbitrary type names
+  for type_name in s:GetDeclaredTypeNames()
+    call extend(all_class_files, s:FindClassFiles(src_pathname..type_name))
+  endfor
+  return all_class_files
+endfunction
+
+" Expose class files for removal etc.
+let b:spotbugs_class_files = s:CollectClassFiles()
+let s:package_dir_heads = repeat(':h', (1 + strlen(substitute(s:package, '[^.;]', '', 'g'))))
+let g:current_compiler = 'spotbugs'
+" CompilerSet makeprg=spotbugs
+let &l:makeprg = 'spotbugs'..(has('win32') ? '.bat' : '')..' '..
+    \ get(b:, 'spotbugs_makeprg_params', get(g:, 'spotbugs_makeprg_params', '-workHard -experimental'))..
+    \ ' -textui -emacs -auxclasspath %:p'..s:package_dir_heads..':S -sourcepath %:p'..s:package_dir_heads..':S '..
+    \ join(b:spotbugs_class_files, ' ')
+" Emacs expects doubled line numbers
+setlocal errorformat=%f:%l:%*[0-9]\ %m,%f:-%*[0-9]:-%*[0-9]\ %m
+
+" " This compiler is meant to be used for a single buffer only
+" exe 'CompilerSet makeprg='..escape(&l:makeprg, ' \|"')
+" exe 'CompilerSet errorformat='..escape(&l:errorformat, ' \|"')
+
+delfunction s:CollectClassFiles
+delfunction s:FindClassFiles
+delfunction s:GlobClassFiles
+delfunction s:GetDeclaredTypeNames
+let &cpo = s:cpo_save
+unlet s:package_dir_heads s:package s:package_names s:type_names s:keywords s:cpo_save
+
+" vim: set foldmethod=syntax shiftwidth=2 expandtab: