### 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
return interfaceClass;
        }
        if (ref instanceof GenericService) {
            return GenericService.class;
        }
        try {
            if (interfaceName != null && interfaceName.length() > 0) {
                this.interfaceClass = Class.forName(interfaceName, true, Thread.currentThread()
                        .getContextClassLoader());
            }
        } catch (ClassNotFoundException t) {
            throw new IllegalStateException(t.getMessage(), t);
        }
        return interfaceClass;
    }
    /**
     * @param interfaceClass
     * @see #setInterface(Class)
     * @deprecated
     */
    public void setInterfaceClass(Class<?> interfaceClass) {
        setInterface(interfaceClass);
    }
    public String getInterface() {
        return interfaceName;
    }
    public void setInterface(Class<?> interfaceClass) {
        if (interfaceClass != null && !interfaceClass.isInterface()) {
            throw new IllegalStateException("The interface class " + interfaceClass + " is not a interface!");
        }