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Service or mapper cannot be injected into a multithread

2022-06-22 17:06:00 【51CTO】

Multiple threads cannot be injected Service perhaps Mapper

1. Problems and causes
2. Solution

2.1 Create a new tool class
2.2 The configuration file

1. Problems and causes

       
       if(
       
       msg.
       
       contains(
       
       " success ")) {
       
       Log 
       
       log 
       
       = 
       
       new 
       
       Log();
       
       log.
       
       setStatus(
       
       1);
       
       log.
       
       setUserId(
       
       Integer.
       
       parseInt(
       
       u.
       
       getStuNum()));
       
       log.
       
       setCreateTime(
       
       MyUtils.
       
       getNowDateTime());
       
       log.
       
       setCount(
       
       Integer.
       
       parseInt(
       
       seat));
       
       logService.
       
       addLog(
       
       log);
       
       break;
       
}
      
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I wanted to realize log insertion through annotation ,
But the null pointer is always reported .
After a period of time, Baidu has tried ,
Finally, the debugging is successful .

2. Solution

2.1 Create a new tool class

       
       import 
       
       org.
       
       springframework.
       
       beans.
       
       BeansException;
       
       import 
       
       org.
       
       springframework.
       
       context.
       
       ApplicationContext;
       
       import 
       
       org.
       
       springframework.
       
       context.
       
       ApplicationContextAware;
       
       /**
       
       * class name: AppBean <BR>
       
       * class description: please write your description <BR>
       
       * @version 1.0 2019 year 4 month 2 Japan   In the morning 10:03:10
       
       * @author Aisino)Jack wei 
       
       */
       
       public 
       
       class 
       
       AppBean 
       
       implements 
       
       ApplicationContextAware {
       
       private 
       
       static 
       
       ApplicationContext 
       
       applicationContext; 
       
       /**
       
       * @Override
       
       * @see org.springframework.context.ApplicationContextAware#setApplicationContext(org.springframework.context.ApplicationContext) <BR>
       
       * Method name: setApplicationContext <BR>
       
       * Description: please write your description <BR>
       
       * Remark: <BR>
       
       * @param applicationContext
       
       * @throws BeansException <BR>
       
       */
       
       @Override
       
       public 
       
       void 
       
       setApplicationContext(
       
       ApplicationContext 
       
       appContext) 
       
       throws 
       
       BeansException {
       
       applicationContext 
       
       = 
       
       appContext;
       
    }
       
       public 
       
       static 
       
       Object 
       
       getBean(
       
       String 
       
       name){
       
       return 
       
       applicationContext.
       
       getBean(
       
       name);
       
    }
       
       public 
       
       static 
       
       ApplicationContext 
       
       getApplicationContext() {  
       
       return 
       
       applicationContext;  
       
     }
       
}
      
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2.2 The configuration file

stay Config Add one under the package Bean

       
       @Bean
       
       public 
       
       AppBean 
       
       appBean() {
       
       return 
       
       new 
       
       AppBean();
       
  }
      
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Or in spring.xml Inside plus

       
       <
       
       bean 
       
       id=
       
       "AppBean" 
       
       class=
       
       "com.xxx.xxx.AppBean"
       
       />
      
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Then add the following statement to the thread ,
Call again .

       
       private 
       
       static 
       
       LogService 
       
       logService 
       
       = (
       
       LogService) 
       
       AppBean.
       
       getBean(
       
       "logService");
      
1.