Resolve the applicationeventmulticast not initialized - call 'refresh' before multicast events exception

solve ApplicationEventMulticaster not initialized - call ‘refresh’ before multicasting events via the context: Root WebApplicationContext abnormal

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introduction

I'm running today ssh The project reported the following errors , Cause my visit project page to appear 404

1.ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: Root WebApplicationContext: startup date [Sat Jul 18 22:34:04 CST 2020]; root of context hierarchy....
2.LifecycleProcessor not initialized - call 'refresh' before invoking lifecycle methods via the context: Root WebApplicationContext: startup date [Sat Jul 18 22:34:04 CST 2020]; root of context hierarchy

The screenshot is as follows

Cause analysis

The primary reason for this is the connection problem with the database , That's where we are spring To configure bean Inside dataSource Of url There is a problem with the connection . This is what I wrote ：

  <property name="url">
   <value>jdbc:mysql://localhost:3306/db_hotel?useUnicode=true&characterEncoding=utf-8</value>
  </property>

Later, it was changed

<property name="url">
   <value>jdbc:mysql://localhost:3306/db_hotel?useUnicode=true&amp;characterEncoding=utf-8</value>
  </property>

Right , added &amp ; It won't be wrong , Successfully run the project ！ as follows ：

Finally, the project was successfully run ！