tomcat:INFO: Illegal access: this web application instance has been stopped alre

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问题描述：

INFO: Illegal access: this web application instance has been stopped already.  Could not load java.net.BindException.  The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1566)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at com.mysql.jdbc.CommunicationsException.<init>(CommunicationsException.java:161)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2759)
at com.mysql.jdbc.MysqlIO.quit(MysqlIO.java:1410)
at com.mysql.jdbc.Connection.realClose(Connection.java:4947)
at com.mysql.jdbc.Connection.cleanup(Connection.java:2063)
at com.mysql.jdbc.Connection.finalize(Connection.java:3403)
at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:83)
at java.lang.ref.Finalizer.access$100(Finalizer.java:14)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:160)


原因：
this is caused by Tomcat unsuccessfully reloading the web application. The app is unloaded, but all threads don't get shut down properly. As a result, when the threads try to run, they get clobbered by the fact that Tomcat has shut down its classloader, and an error is logged. The best fix is to turn off automatic webapp reloading for the application: in Tomcat's server.xml , find the <Context> declaration, and ensure it is set to: reloadable="false"

解决办法：

• 重启tomcat
  
• 修改配置文件 reloadable=false ----仅在开发过程中推荐使用，便于调试。