系统经常性自动挂掉，报错日志如下

09-Jan-2019 11:10:04.823 WARNING [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [renren-fast] appears to have started a thread named [mybatis-plus MapperRefresh] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread: java.lang.Thread.sleep(Native Method) com.baomidou.mybatisplus.spring.MybatisMapperRefresh$1.run(MybatisMapperRefresh.java:173) java.lang.Thread.run(Thread.java:748) 09-Jan-2019 11:10:04.824 WARNING [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [renren-fast] appears to have started a thread named [RenrenScheduler_Worker-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread: java.lang.Object.wait(Native Method) org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:568) 09-Jan-2019 11:10:04.824 WARNING [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [renren-fast] appears to have started a thread named [RenrenScheduler_Worker-2] 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) org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:568) 09-Jan-2019 11:10:04.825 WARNING [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [taoliyuanManager] appears to have started a thread named [RenrenScheduler_Worker-3] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread: java.lang.Object.wait(Native Method) org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:568) 09-Jan-2019 11:10:04.826 WARNING [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [renren-fast] appears to have started a thread named [RenrenScheduler_Worker-4] 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)