### Environment

* Dubbo version: 3.0.6
* Operating System version: windows10
* Java version: jdk1.8

### Steps to reproduce this issue

String loadbalance() default ClusterRules.EMPTY;



*/
    int delay() default -1;
    /**
     * @see DubboService#stub()
     * @deprecated
     */
    String local() default "";
    /**
     * Service stub name, use interface name + Local if not set
     */
    String stub() default "";
    /**
     * Cluster strategy, legal values include: failover, failfast, failsafe, failback, forking
     * you can use {@link org.apache.dubbo.common.constants.ClusterRules#FAIL_FAST} ……
     */
    String cluster() default ClusterRules.EMPTY;
    /**
     * How the proxy is generated, legal values include: jdk, javassist
     */
    String proxy() default "";
    /**
     * Maximum connections service provider can accept, default value is -1 - connection is shared
     */
    int connections() default -1;
    /**
     * The callback instance limit peer connection
     * <p>
     * see org.apache.dubbo.common.constants.CommonConstants.DEFAULT_CALLBACK_INSTANCES
     */
    int callbacks() default -1;