dubbo-common/src/main/java/org/apache/dubbo/config/annotation/DubboReference.java [179:286]:
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    int connections() default -1;

    /**
     * The callback instance limit peer connection
     * <p>
     * see org.apache.dubbo.rpc.Constants#DEFAULT_CALLBACK_INSTANCES
     */
    int callbacks() default -1;

    /**
     * Callback method name when connected, default value is empty string
     */
    String onconnect() default "";

    /**
     * Callback method name when disconnected, default value is empty string
     */
    String ondisconnect() default "";

    /**
     * Service owner, default value is empty string
     */
    String owner() default "";

    /**
     * Service layer, default value is empty string
     */
    String layer() default "";

    /**
     * Service invocation retry times
     * <p>
     * see Constants#DEFAULT_RETRIES
     */
    int retries() default -1;

    /**
     * Load balance strategy, legal values include: random, roundrobin, leastactive
     * you can use {@link org.apache.dubbo.common.constants.LoadbalanceRules#RANDOM} ……
     */
    String loadbalance() default LoadbalanceRules.EMPTY;

    /**
     * Whether to enable async invocation, default value is false
     */
    boolean async() default false;

    /**
     * Maximum active requests allowed, default value is 0
     */
    int actives() default -1;

    /**
     * Whether the async request has already been sent, the default value is false
     */
    boolean sent() default false;

    /**
     * Service mock name, use interface name + Mock if not set
     */
    String mock() default "";

    /**
     * Whether to use JSR303 validation, legal values are: true, false
     */
    String validation() default "";

    /**
     * Timeout value for service invocation, default value is 0
     */
    int timeout() default -1;

    /**
     * Specify cache implementation for service invocation, legal values include: lru, threadlocal, jcache
     */
    String cache() default "";

    /**
     * Filters for service invocation
     * <p>
     * see Filter
     */
    String[] filter() default {};

    /**
     * Listeners for service exporting and unexporting
     * <p>
     * see ExporterListener
     */
    String[] listener() default {};

    /**
     * Customized parameter key-value pair, for example: {key1, value1, key2, value2} or {"key1=value1", "key2=value2"}
     */
    String[] parameters() default {};

    /**
     * Application name
     *
     * @deprecated This attribute was deprecated, use bind application/module of spring ApplicationContext
     */
    @Deprecated
    String application() default "";

    /**
     * Module associated name
     */
    String module() default "";
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dubbo-common/src/main/java/org/apache/dubbo/config/annotation/DubboService.java [167:284]:
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    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;

    /**
     * Callback method name when connected, default value is empty string
     */
    String onconnect() default "";

    /**
     * Callback method name when disconnected, default value is empty string
     */
    String ondisconnect() default "";

    /**
     * Service owner, default value is empty string
     */
    String owner() default "";

    /**
     * Service layer, default value is empty string
     */
    String layer() default "";

    /**
     * Service invocation retry times
     *
     * @see org.apache.dubbo.common.constants.CommonConstants#DEFAULT_RETRIES
     */
    int retries() default -1;

    /**
     * Load balance strategy, legal values include: random, roundrobin, leastactive
     *
     * you can use {@link org.apache.dubbo.common.constants.LoadbalanceRules#RANDOM} ……
     */
    String loadbalance() default LoadbalanceRules.EMPTY;

    /**
     * Whether to enable async invocation, default value is false
     */
    boolean async() default false;

    /**
     * Maximum active requests allowed, default value is -1
     */
    int actives() default -1;

    /**
     * Whether the async request has already been sent, the default value is false
     */
    boolean sent() default false;

    /**
     * Service mock name, use interface name + Mock if not set
     */
    String mock() default "";

    /**
     * Whether to use JSR303 validation, legal values are: true, false
     */
    String validation() default "";

    /**
     * Timeout value for service invocation, default value is -1
     */
    int timeout() default -1;

    /**
     * Specify cache implementation for service invocation, legal values include: lru, threadlocal, jcache
     */
    String cache() default "";

    /**
     * Filters for service invocation
     *
     * @see Filter
     */
    String[] filter() default {};

    /**
     * Listeners for service exporting and unexporting
     *
     * @see ExporterListener
     */
    String[] listener() default {};

    /**
     * Customized parameter key-value pair, for example:
     * <pre>
     *  ["a","b"] ==> {a=b}
     *  [" a "," b "] ==> {a=b}
     *  ["a=b"] ==>{a=b}
     *  ["a:b"] ==>{a=b}
     *  ["a=b","c","d"] ==>{a=b,c=d}
     *  ["a","a:b"] ==>{a="a:b"}
     *  ["a","a,b"] ==>{a="a,b"}
     * </pre>
     * @see org.apache.dubbo.config.spring.util.DubboAnnotationUtils#convertParameters(java.lang.String[])
     */
    String[] parameters() default {};

    /**
     * Application spring bean name
     * @deprecated This attribute was deprecated, use bind application/module of spring ApplicationContext
     */
    @Deprecated
    String application() default "";

    /**
     * Module spring bean name
     */
    String module() default "";
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