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java.lang.NullPointerException: 	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:270)	at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:246)	at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182)	at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:701)	at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:635)	at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:486)	at org.apache.tomcat.jdbc.pool.ConnectionPool.(ConnectionPool.java:144)	at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:116)	at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:103)	at org.apache.tomcat.jdbc.pool.DataSourceFactory.createDataSource(DataSourceFactory.java:554)	at org.apache.tomcat.jdbc.pool.DataSourceFactory.getObjectInstance(DataSourceFactory.java:242)	at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:141)	at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)	at org.apache.naming.NamingContext.lookup(NamingContext.java:842)	at org.apache.naming.NamingContext.lookup(NamingContext.java:153)	at org.apache.naming.NamingContext.lookup(NamingContext.java:830)	at org.apache.naming.NamingContext.lookup(NamingContext.java:167)	at org.apache.catalina.core.NamingContextListener.addResource(NamingContextListener.java:1091)	at org.apache.catalina.core.NamingContextListener.createNamingContext(NamingContextListener.java:670)	at org.apache.catalina.core.NamingContextListener.lifecycleEvent(NamingContextListener.java:269)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5355)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)	at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1073)	at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1857)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)	at java.util.concurrent.FutureTask.run(FutureTask.java:166)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:724)