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ApplicationId myAppId = ...;
DeviceId myDeviceId = ...''
Bmv2DeviceContext myContext = ...;

Bmv2Configuration myConfiguration = myContext.configuration();

Ip4Prefix dstPrefix = Ip4Prefix.valueOf("192.16.184.0/24");

ExtensionSelector extSelector = Bmv2ExtensionSelector.builder()
        .forConfiguration(myConfiguration)
        .matchExact("standard_metadata", "ingress_port", 10)
        .matchLpm("ipv4", "dstAddr", dstPrefix.address().toOctets(), dstPrefix.prefixLength())
        .build();

ExtensionTreatment extTreatment = Bmv2ExtensionTreatment.builder()
        .forConfiguration(myConfiguration)
        .setActionName("next_hop")
        .addParameter("nhop_id", 4)
        .build();

FlowRule rule = DefaultFlowRule.builder()
        .forDevice(myDeviceId)
        .fromApp(myAppId)
        .forTable(0)
        .withSelector(DefaultTrafficSelector.builder()
                              .extension(extSelector, myDeviceId)
                              .build())
        .withTreatment(DefaultTrafficTreatment.builder()
                               .extension(extTreatment, myDeviceId)
                               .build())
        .build();