Today, when debugging the program, it was good. Later, when restarting the service, it was stuck behind the log of com.alibaba.druid.pool.druiddatasource | {datasource-1} initiated, as shown in the figure 
After a variety of debugging, restart or card here
Finally, I found that I made a breakpoint in a method of mapper interface, which is a real fucker 
After canceling the breakpoint, it starts successfully
Read More:
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