### Environment

* Dubbo version: 2.7.3
* Operating System version: win 10
* Java version: 1.8

系统启动时报
Caused by: java.lang.IllegalArgumentException: Unsupported generic type false
	at org.apache.dubbo.config.ServiceConfig.setGeneric(ServiceConfig.java:1015)

这个错误只有在2.7.3的时候存在，在使用2.7.2的时候没有
private transient volatile boolean unexported;
    /**
     * whether it is a GenericService
     */
    private volatile String generic;
    public ServiceConfig() {
    }
    public ServiceConfig(Service service) {
        appendAnnotation(Service.class, service);
        setMethods(MethodConfig.constructMethodConfig(service.methods()));
    }
    @Deprecated
    private static List<ProtocolConfig> convertProviderToProtocol(List<ProviderConfig> providers) {
        if (CollectionUtils.isEmpty(providers)) {
            return null;
        }
        List<ProtocolConfig> protocols = new ArrayList<ProtocolConfig>(providers.size());
        for (ProviderConfig provider : providers) {
            protocols.add(convertProviderToProtocol(provider));
        }
        return protocols;
    }
    @Deprecated
    private static List<ProviderConfig> convertProtocolToProvider(List<ProtocolConfig> protocols) {
        if (CollectionUtils.isEmpty(protocols)) {
            return null;
        }
        List<ProviderConfig> providers = new ArrayList<ProviderConfig>(protocols.size());
        for (ProtocolConfig provider : protocols) {
            providers.add(convertProtocolToProvider(provider));