NPE隐患处理。

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

@@ -78,6 +78,7 @@ public class XxlJobSpringExecutor extends XxlJobExecutor implements ApplicationC
 
         // init job handler from method
         String[] beanDefinitionNames = applicationContext.getBeanDefinitionNames();
+        if (beanDefinitionNames!=null && beanDefinitionNames.length>0) {
             for (String beanDefinitionName : beanDefinitionNames) {
                 Object bean = applicationContext.getBean(beanDefinitionName);
                 Method[] methods = bean.getClass().getDeclaredMethods();
@@ -133,6 +134,8 @@ public class XxlJobSpringExecutor extends XxlJobExecutor implements ApplicationC
             }
         }
 
+    }
+
     // ---------------------- applicationContext ----------------------
     private static ApplicationContext applicationContext;