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java.lang.NullPointerException: 	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:169)	at com.atlassian.confluence.setup.DefaultBootstrapManager.isDriverPresent(DefaultBootstrapManager.java:257)	at com.atlassian.confluence.setup.DefaultBootstrapManager.checkMySQLDriverIsPresent(DefaultBootstrapManager.java:240)	at com.atlassian.confluence.setup.DefaultBootstrapManager.performPersistenceUpgrade(DefaultBootstrapManager.java:175)	at com.atlassian.config.bootstrap.DefaultAtlassianBootstrapManager.init(DefaultAtlassianBootstrapManager.java:76)	at com.atlassian.config.util.BootstrapUtils.init(BootstrapUtils.java:35)	at com.atlassian.confluence.setup.ConfluenceConfigurationListener.initialiseBootstrapContext(ConfluenceConfigurationListener.java:90)	at com.atlassian.confluence.setup.ConfluenceConfigurationListener.contextInitialized(ConfluenceConfigurationListener.java:46)	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4206)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)	at org.apache.catalina.core.StandardService.start(StandardService.java:525)	at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)	at org.apache.catalina.startup.Catalina.start(Catalina.java:595)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)