update document

xxl-job-core/src/main/java/com/xxl/job/core/executor/impl/XxlJobSpringExecutor.java

 import com.xxl.job.core.handler.IJobHandler;
 import com.xxl.job.core.handler.annotation.JobHandler;
 import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.DisposableBean;
+import org.springframework.beans.factory.InitializingBean;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationContextAware;
 
  *
  * @author xuxueli 2018-11-01 09:24:52
  */
-public class XxlJobSpringExecutor extends XxlJobExecutor implements ApplicationContextAware {
+public class XxlJobSpringExecutor extends XxlJobExecutor implements ApplicationContextAware, InitializingBean, DisposableBean {
 
 
+    // start
     @Override
-    public void start() throws Exception {
+    public void afterPropertiesSet() throws Exception {
 
         // init JobHandler Repository
         initJobHandlerRepository(applicationContext);
         super.start();
     }
 
+    // destroy
+    @Override
+    public void destroy() {
+        super.destroy();
+    }
+
+
     private void initJobHandlerRepository(ApplicationContext applicationContext){
         if (applicationContext == null) {
             return;

xxl-job-executor-samples/xxl-job-executor-sample-springboot/src/main/java/com/xxl/job/executor/core/config/XxlJobConfig.java

     private int logRetentionDays;
 
 
-    @Bean(initMethod = "start", destroyMethod = "destroy")
+    @Bean
     public XxlJobSpringExecutor xxlJobExecutor() {
         logger.info(">>>>>>>>>>> xxl-job config init.");
         XxlJobSpringExecutor xxlJobSpringExecutor = new XxlJobSpringExecutor();