### 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
}
                            }
                        } else if (argument.getIndex() != -1) {
                            appendParameters(map, argument, method.getName() + "." + argument.getIndex());
                        } else {
                            throw new IllegalArgumentException("Argument config must set index or type attribute.eg: <dubbo:argument index='0' .../> or <dubbo:argument type=xxx .../>");
                        }
                    }
                }
            } // 
        }
        if (ProtocolUtils.isGeneric(generic)) {
            map.put(GENERIC_KEY, generic);
            map.put(METHODS_KEY, ANY_VALUE);
        } else {
            String revision = Version.getVersion(interfaceClass, version);
            if (revision != null && revision.length() > 0) {
                map.put(REVISION_KEY, revision);
            }
            String[] methods = Wrapper.getWrapper(interfaceClass).getMethodNames();
            if (methods.length == 0) {
                logger.warn("No method found in service interface " + interfaceClass.getName());
                map.put(METHODS_KEY, ANY_VALUE);
            } else {
                map.put(METHODS_KEY, StringUtils.join(new HashSet<String>(Arrays.asList(methods)), ","));
            }
        }
        if (!ConfigUtils.isEmpty(token)) {
            if (ConfigUtils.isDefault(token)) {
                map.put(TOKEN_KEY, UUID.randomUUID().toString());