Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.6.0:compile (default-compile) on project  dubbo-rpc-xml: Compilation failure 

dubbo\dubbo-rpc\dubbo-rpc-xml\src\main\java\org\apache\dubbo\xml\rpc\protocol\xmlrpc\XmlRpcProtocol.java:[154,4] 错误: Override 不是可重复的注释类型



} catch (Exception e) {
            throw new RpcException(e);
        }
        xmlRpcServer.setHandlerMapping(propertyHandlerMapping);
        XmlRpcServerConfigImpl xmlRpcServerConfig = (XmlRpcServerConfigImpl) xmlRpcServer.getConfig();
        xmlRpcServerConfig.setEnabledForExceptions(true);
        xmlRpcServerConfig.setContentLengthOptional(false);
        skeletonMap.put(path, xmlRpcServer);
        return new Runnable() {
            @Override
            public void run() {
                skeletonMap.remove(path);
            }
        };
    }
    @Override
    @SuppressWarnings("unchecked")
    @Override
    protected <T> T doRefer(final Class<T> serviceType, URL url) throws RpcException {
        XmlRpcProxyFactoryBean xmlRpcProxyFactoryBean = new XmlRpcProxyFactoryBean();
        xmlRpcProxyFactoryBean.setServiceUrl(url.setProtocol("http").toIdentityString());
        xmlRpcProxyFactoryBean.setServiceInterface(serviceType);
        xmlRpcProxyFactoryBean.afterPropertiesSet();
        return (T) xmlRpcProxyFactoryBean.getObject();
    }
    @Override
    protected int getErrorCode(Throwable e) {
        if (e instanceof RemoteAccessException) {
            e = e.getCause();
        }