Illegal access: this web application instance has been stopped already.  Could not load oracle.net.mesg.Message.  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.util.ResourceBundle$Control.newBundle(ResourceBundle.java:2289)  at java.util.ResourceBundle.loadBundle(ResourceBundle.java:1364)  at java.util.ResourceBundle.findBundle(ResourceBundle.java:1328)  at java.util.ResourceBundle.findBundle(ResourceBundle.java:1282)  at java.util.ResourceBundle.findBundle(ResourceBundle.java:1282)  at java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1224)  at java.util.ResourceBundle.getBundle(ResourceBundle.java:705)  at oracle.net.ns.Message11.getMessage(Unknown Source)  at oracle.net.ns.NetException.getMessage(Unknown Source)  at oracle.jdbc.ttc7.TTC7Protocol.connect(TTC7Protocol.java:1695)  at oracle.jdbc.ttc7.TTC7Protocol.logon(TTC7Protocol.java:214)  at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:346)  at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:468)  at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:314)  at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134)  at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)  at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)  at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)  at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)  at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)  at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)  at com.mchange.v2.async.ThreadPerTaskAsynchronousRunner$TaskThread.run(ThreadPerTaskAsynchronousRunner.java:255)

原因是因为在tomcat重启的时候，之前的tomcat的线程还没有完全关闭，最新启动tomcat就会报这个异常，只要把tomcat的server.xml 中的reloadable="true" 改成false就OK