Tests: added Java threading tests.

test/java/threads/app.java

@@ -0,0 +1,32 @@
+
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+@WebServlet("/")
+public class app extends HttpServlet
+{
+    @Override
+    public void doGet(HttpServletRequest request, HttpServletResponse response)
+        throws IOException, ServletException
+    {
+        int delay = 0;
+
+        String x_delay = request.getHeader("X-Delay");
+        if (x_delay != null) {
+            delay = Integer.parseInt(x_delay);
+        }
+
+        try {
+            Thread.sleep(delay * 1000);
+        } catch (InterruptedException ex) {
+            ex.printStackTrace();
+        }
+
+        response.addHeader("X-Thread", "" + Thread.currentThread().getId());
+    }
+}