Upgrading Confluence 2.9 on Resin 3.0.x fails with a NullPointerException

Following exception thrown when upgrading Confluence to v2.9 on Resin 3.0.x

2008-09-10 08:14:35,129 INFO [main] [com.atlassian.confluence.lifecycle] contextInitialized Starting Confluence 2.9 (build #1415)
2008-09-10 08:15:02,508 ERROR [main] [com.atlassian.upgrade.AbstractUpgradeManager] upgrade Exception thrown during upgrade: null
java.lang.NullPointerException
at com.atlassian.upgrade.AbstractUpgradeManager.needUpgrade(AbstractUpgradeManager.java:267)
at com.atlassian.upgrade.AbstractUpgradeManager.upgrade(AbstractUpgradeManager.java:45)
at com.atlassian.confluence.upgrade.impl.DefaultUpgradeManager.upgrade(DefaultUpgradeManager.java:72)
at com.atlassian.upgrade.UpgradeLauncherServletContextListener.contextInitialized(UpgradeLauncherServletContextListener.java:26)
at com.caucho.server.webapp.Application.start(Application.java:1647)
at com.caucho.server.deploy.DeployController.startImpl(DeployController.java:621)
at com.caucho.server.deploy.StartAutoRedeployAutoStrategy.startOnInit(StartAutoRedeployAutoStrategy.java:72)
at com.caucho.server.deploy.DeployController.startOnInit(DeployController.java:509)
at com.caucho.server.deploy.DeployContainer.start(DeployContainer.java:153)
at com.caucho.server.webapp.ApplicationContainer.start(ApplicationContainer.java:670)
at com.caucho.server.host.Host.start(Host.java:420)
at com.caucho.server.deploy.DeployController.startImpl(DeployController.java:621)
at com.caucho.server.deploy.StartAutoRedeployAutoStrategy.startOnInit(StartAutoRedeployAutoStrategy.java:72)
at com.caucho.server.deploy.DeployController.startOnInit(DeployController.java:509)
at com.caucho.server.deploy.DeployContainer.start(DeployContainer.java:153)
at com.caucho.server.host.HostContainer.start(HostContainer.java:504)
at com.caucho.server.resin.ServletServer.start(ServletServer.java:971)
at com.caucho.server.deploy.DeployController.startImpl(DeployController.java:621)
at com.caucho.server.deploy.AbstractDeployControllerStrategy.start(AbstractDeployControllerStrategy.java:56)
at com.caucho.server.deploy.DeployController.start(DeployController.java:517)
at com.caucho.server.resin.ResinServer.start(ResinServer.java:551)
at com.caucho.server.resin.Resin.init(Resin.java)
at com.caucho.server.resin.Resin.main(Resin.java:625)
at com.caucho.server.http.ResinServer.main(ResinServer.java:61)
2008-09-10 08:15:02,538 FATAL [main] [com.atlassian.upgrade.UpgradeLauncherServletContextListener] contextInitialized Upgrade failed, application will not start: java.lang.NullPointerException
com.atlassian.upgrade.UpgradeException: java.lang.NullPointerException
at com.atlassian.upgrade.AbstractUpgradeManager.upgrade(AbstractUpgradeManager.java:79)
at com.atlassian.confluence.upgrade.impl.DefaultUpgradeManager.upgrade(DefaultUpgradeManager.java:72)
at com.atlassian.upgrade.UpgradeLauncherServletContextListener.contextInitialized(UpgradeLauncherServletContextListener.java:26)
at com.caucho.server.webapp.Application.start(Application.java:1647)
at com.caucho.server.deploy.DeployController.startImpl(DeployController.java:621)
at com.caucho.server.deploy.StartAutoRedeployAutoStrategy.startOnInit(StartAutoRedeployAutoStrategy.java:72)
at com.caucho.server.deploy.DeployController.startOnInit(DeployController.java:509)
at com.caucho.server.deploy.DeployContainer.start(DeployContainer.java:153)
at com.caucho.server.webapp.ApplicationContainer.start(ApplicationContainer.java:670)
at com.caucho.server.host.Host.start(Host.java:420)
at com.caucho.server.deploy.DeployController.startImpl(DeployController.java:621)
at com.caucho.server.deploy.StartAutoRedeployAutoStrategy.startOnInit(StartAutoRedeployAutoStrategy.java:72)
at com.caucho.server.deploy.DeployController.startOnInit(DeployController.java:509)
at com.caucho.server.deploy.DeployContainer.start(DeployContainer.java:153)
at com.caucho.server.host.HostContainer.start(HostContainer.java:504)
at com.caucho.server.resin.ServletServer.start(ServletServer.java:971)
at com.caucho.server.deploy.DeployController.startImpl(DeployController.java:621)
at com.caucho.server.deploy.AbstractDeployControllerStrategy.start(AbstractDeployControllerStrategy.java:56)
at com.caucho.server.deploy.DeployController.start(DeployController.java:517)
at com.caucho.server.resin.ResinServer.start(ResinServer.java:551)
at com.caucho.server.resin.Resin.init(Resin.java)
at com.caucho.server.resin.Resin.main(Resin.java:625)
at com.caucho.server.http.ResinServer.main(ResinServer.java:61)
Caused by: java.lang.NullPointerException
at com.atlassian.upgrade.AbstractUpgradeManager.needUpgrade(AbstractUpgradeManager.java:267)
at com.atlassian.upgrade.AbstractUpgradeManager.upgrade(AbstractUpgradeManager.java:45)
... 22 more
2008-09-10 08:15:03,279 INFO [main] [com.atlassian.confluence.lifecycle] init Confluence is ready to serve