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Cannot update schema
net.sf.hibernate.HibernateException: Dialect class not found: bucket.dialect.MySQLDialect	at net.sf.hibernate.dialect.Dialect.getDialect(Dialect.java:396)	at net.sf.hibernate.tool.hbm2ddl.SchemaUpdate.(SchemaUpdate.java:40)	at net.sf.hibernate.tool.hbm2ddl.SchemaUpdate.(SchemaUpdate.java:35)	at bucket.core.persistence.hibernate.schema.SchemaHelper.updateSchemaIfNeeded(SchemaHelper.java:155)	at bucket.core.persistence.hibernate.schema.SchemaHelper.updateSchemaIfNeeded(SchemaHelper.java:142)	at com.atlassian.upgrade.AbstractUpgradeManager.upgradeSchema(AbstractUpgradeManager.java:137)	at com.atlassian.upgrade.AbstractUpgradeManager.upgrade(AbstractUpgradeManager.java:46)	at com.atlassian.confluence.upgrade.impl.DefaultUpgradeManager.upgrade(DefaultUpgradeManager.java:57)	at com.atlassian.upgrade.UpgradeLauncherServletContextListener.contextInitialized(UpgradeLauncherServletContextListener.java:26)	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3729)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4187)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)	at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:608)	at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:535)	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:470)	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1122)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1021)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)	at org.apache.catalina.core.StandardService.start(StandardService.java:450)	at org.apache.catalina.core.StandardServer.start(StandardServer.java:709)	at org.apache.catalina.startup.Catalina.start(Catalina.java:551)	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:585)	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)