What are the situations when jvm is closed in java?

1. JVM shutdown

(1) Normal shutdown

All non-daemon thread execution ends

System.exit(0)

ctrl c

kill -15 SIGTERM signal

(2) Abnormal shutdown

RuntimeExcetion

OOM

(3) Forced shutdown

kill -9 SIGKILL signal

Runtime.halt()

Power off

System shutdown

System crash

2. Example

public void start(){
  Runtime.getRuntime().addShutdownHook(new Thread(){
     public void run(){
       try{
         LogService.this.stop();
       }catch(InterruptedException){
       
       }
     }
 });
}

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