fix: invalid data dir name generated on windows

lua/java-core/ls/servers/jdtls/utils.lua

@@ -7,11 +7,11 @@ local M = {}
 ---Returns the workspace directory path based on the current dir
 ---@return string
 function M.get_workspace_path()
-	local project_path =
-		string.gsub(vim.fn.fnamemodify(vim.fn.getcwd(), ':p:h'), '/', '_')
+	local project_path = vim.fn.fnamemodify(vim.fn.getcwd(), ':p:h')
+	local project_path_hash = string.gsub(project_path, '[/\\:+-]', '_')
 
 	local nvim_cache_path = vim.fn.stdpath('cache')
-	return join(nvim_cache_path, 'jdtls', 'workspaces', project_path)
+	return join(nvim_cache_path, 'jdtls', 'workspaces', project_path_hash)
 end
 
 ---Returns the jdtls config cache directory

lua/java-core/utils/path.lua

@@ -1,10 +1,16 @@
 local M = {}
 
+if vim.fn.has('win32') == 1 or vim.fn.has('win32unix') == 1 then
+	M.path_separator = '\\'
+else
+	M.path_separator = '/'
+end
+
 ---Join a given list of paths to one path
 ---@param ... string paths to join
 ---@return string # joined path
 function M.join(...)
-	return table.concat({ ... }, '/')
+	return table.concat({ ... }, M.path_separator)
 end
 
 return M