add try catch

src/main/java/ic/doc/WebServer.java

@@ -94,13 +94,19 @@ public class WebServer {
                     bw.close();
 
                     resp.setContentType("application/pdf");
-                    resp.setHeader("Content-disposition", "attachment; filename=haha.pdf");
+                    resp.setHeader("Content-disposition", "attachment; filename=anything.pdf");
 
                     String path = file.getAbsolutePath();
                     ProcessBuilder pb = new ProcessBuilder("bash", "-c", "pandoc -s -o answer.pdf " + path);
 //                    String[] cm = {"pandoc", "-s", "-o", "sample.pdf", "answer.md"};
 //                    pb.command(cm);
-                    pb.start();
+                    Process process = pb.start();
+
+                    try {
+                        process.waitFor();
+                    } catch (InterruptedException e) {
+                        e.printStackTrace();
+                    }
 
                     try (InputStream in = new FileInputStream("answer.pdf");
                          OutputStream out = resp.getOutputStream()) {