fix: support java 7 in test

dd-java-agent/instrumentation/sparkjava/src/test/java/TestSparkJavaApplication.java

@@ -1,13 +1,31 @@
+import spark.Request;
+import spark.Response;
+import spark.Route;
 import spark.Spark;
 
 public class TestSparkJavaApplication {
 
   public static void main(final String[] args) {
 
-    Spark.get("/", (req, res) -> "Hello World");
-    Spark.get("/param/:param", (req, res) -> "Hello " + req.params("param"));
-    Spark.get("/exception/:param", (req, res) -> {
-      throw new RuntimeException(req.params("param"));
+    Spark.get("/", new Route() {
+      @Override
+      public Object handle(Request request, Response response) throws Exception {
+        return "Hello World";
+      }
+    });
+
+    Spark.get("/param/:param", new Route() {
+      @Override
+      public Object handle(Request request, Response response) throws Exception {
+        return "Hello " + request.params("param");
+      }
+    });
+
+    Spark.get("/exception/:param", new Route() {
+      @Override
+      public Object handle(Request request, Response response) throws Exception {
+        throw new RuntimeException(request.params("param"));
+      }
     });
 
   }