feat: add java formatter and add error to running tests

init.lua

@@ -273,6 +273,7 @@ local function run_selected_test()
 			local cmd = string.format("./gradlew clean test --tests %s.%s", class_name, method_name)
 			vim.cmd("vsplit | terminal " .. cmd)
 		end
+		error("No class and method name found")
 	else
 		error("Unsupported filetype: " .. filetype)
 	end
@@ -308,6 +309,7 @@ require("conform").setup({
 	formatters_by_ft = {
 		html = { "prettier" },
 		svg = { "prettier" },
+		java = { "google-java-format" },
 		markdown = { "mdformat" },
 	},
 	formatters = {