fixed package error

apm-collector/apm-collector-agentserver/src/main/java/org/skywalking/apm/collector/agentserver/jetty/handler/AgentStreamGRPCServerHandler.java

@@ -30,4 +30,8 @@ public class AgentStreamGRPCServerHandler extends JettyHandler {
         });
         return serverArray;
     }
+
+    @Override protected void doPost(HttpServletRequest req) throws ArgumentsParseException {
+        throw new UnsupportedOperationException();
+    }
 }

apm-collector/apm-collector-agentserver/src/main/java/org/skywalking/apm/collector/agentserver/jetty/handler/AgentStreamJettyServerHandler.java

@@ -30,4 +30,8 @@ public class AgentStreamJettyServerHandler extends JettyHandler {
         });
         return serverArray;
     }
+
+    @Override protected void doPost(HttpServletRequest req) throws ArgumentsParseException {
+        throw new UnsupportedOperationException();
+    }
 }