[Abandoned connection cleanup thread] but has failed to stop it.
错误这样样子：
警告: The web application [xx] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:java.lang.Object.wait(Native Method)java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:43)mysql的cleanup的线程没有关闭而已。
可以在ServletContextListener里如下代码：
AbandonedConnectionCleanupThread.shutdown();
Thread.sleep(2000);Thread.sleep(2000);是为了确保不会打印该异常
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