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java.lang.NullPointerException: 	at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(Unknown Source)	at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(Unknown Source)	at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(Unknown Source)	at java.sql.DriverManager.getDriver(Unknown Source)	at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1143)	at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)	at listener.MyContextListener.contextInitialized(Unknown Source)	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526)	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1041)	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:964)	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:502)	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)	at org.apache.catalina.core.StandardService.start(StandardService.java:516)	at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)	at org.apache.catalina.startup.Catalina.start(Catalina.java:593)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)