bugfix:获取XxlJob注解方法时，非单例bean引发的报错

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

@@ -81,7 +81,7 @@ public class XxlJobSpringExecutor extends XxlJobExecutor implements ApplicationC
             return;
         }
         // init job handler from method
-        String[] beanDefinitionNames = applicationContext.getBeanDefinitionNames();
+        String[] beanDefinitionNames = applicationContext.getBeanNamesForType(Object.class, false, true);
         for (String beanDefinitionName : beanDefinitionNames) {
             Object bean = applicationContext.getBean(beanDefinitionName);