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



import org.apache.xmlrpc.server.XmlRpcServerConfigImpl;
import org.apache.xmlrpc.webserver.XmlRpcServletServer;
import org.springframework.remoting.RemoteAccessException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.SocketTimeoutException;
import java.util.ArrayList;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class XmlRpcProtocol extends AbstractProxyProtocol {
    
    public static final String ACCESS_CONTROL_ALLOW_ORIGIN_HEADER = "Access-Control-Allow-Origin";
    public static final String ACCESS_CONTROL_ALLOW_METHODS_HEADER = "Access-Control-Allow-Methods";
    public static final String ACCESS_CONTROL_ALLOW_HEADERS_HEADER = "Access-Control-Allow-Headers";
    private final Map<String, HttpServer> serverMap = new ConcurrentHashMap<>();
    private final Map<String, XmlRpcServletServer> skeletonMap = new ConcurrentHashMap<>();
    private HttpBinder httpBinder;
    public XmlRpcProtocol() {
        super(XmlRpcException.class);
    }
    public void setHttpBinder(HttpBinder httpBinder) {
        this.httpBinder = httpBinder;
    }
    @Override
    public int getDefaultPort() {
        return 80;
    }
    private class InternalHandler implements HttpHandler {