It is normal to run a Tomcat project. When running two Tomcat projects, an exception will be reported.
ERROR [com.alibaba.druid.stat.DruidDataSourceStatManager] – unregister mbean error javax.management.InstanceNotFoundException: com.alibaba.druid:type=DruidDataSourceStat at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getMBean………
Solution:
Modify catalina.sh under Tomcat: add and set Java at the end_OPTS="Ddruid.registerToSysProperty=true"
This method is effective in personal test. If it is added in other places, it is not guaranteed to be effective
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