diff --git a/home/programs/nvim.nix b/home/programs/nvim.nix
index 3da273a..b8fc4a8 100644
--- a/home/programs/nvim.nix
+++ b/home/programs/nvim.nix
@@ -137,6 +137,15 @@ in
       end
 
       local java_home = os.getenv("JAVA_HOME")
+      if not java_home then
+        local javac = vim.fn.exepath("javac")
+        if javac ~= "" then
+          java_home = vim.fn.fnamemodify(vim.fn.resolve(javac), ":h:h")
+        end
+      end
+      if not java_home then
+        vim.notify("No JAVA_HOME and no javac on PATH - jdtls will guess a runtime", vim.log.levels.WARN)
+      end
       if not java_home then
         vim.notify("JAVA_HOME unset - jdtls will guess a runtime", vim.log.levels.WARN)
       end