### 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 ProtocolUtils() {
    }
    public static String serviceKey(URL url) {
        return serviceKey(url.getPort(), url.getPath(), url.getParameter(VERSION_KEY),
                url.getParameter(GROUP_KEY));
    }
    public static String serviceKey(int port, String serviceName, String serviceVersion, String serviceGroup) {
        StringBuilder buf = new StringBuilder();
        if (StringUtils.isNotEmpty(serviceGroup)) {
            buf.append(serviceGroup);
            buf.append("/");
        }
        buf.append(serviceName);
        if (serviceVersion != null && serviceVersion.length() > 0 && !"0.0.0".equals(serviceVersion)) {
            buf.append(":");
            buf.append(serviceVersion);
        }
        buf.append(":");
        buf.append(port);