我下载了 liferay-7 tomcat捆绑包并使用Oracle 11G数据库。我尝试添加 ojdbc6_g.jar，ojdbc14.jar and class12.jar ，但是什么都没有。每次由于不兼容的冬眠方言而获得NullPoInterException。
13:54:47,634 INFO [Start Level: Equinox Container: 00717612-6e3c-0016-1f0e-a5e81700fe44][node:410] [Inferno] closed
13:55:57,206 INFO [localhost-startStop-1][DialectDetector:75] Determine dialect for Oracle 11.2
13:55:57,273 INFO [localhost-startStop-1][DialectDetector:148] Found dialect org.hibernate.dialect.Oracle10gDialect
13:55:57,529 ERROR [localhost-startStop-1][PortalContextLoaderListener:114] java.lang.NullPointerException
java.lang.NullPointerException
at com.liferay.portal.kernel.servlet.DirectServletRegistryUtil.clearServlets(DirectServletRegistryUtil.java:27)
at com.liferay.portal.spring.context.PortalContextLoaderListener.contextDestroyed(PortalContextLoaderListener.java:132)
at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:4859)
at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5478)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:224)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:159)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:585)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1794)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
13:55:57,531 ERROR [localhost-startStop-1][PortalContextLoaderListener:114] java.lang.NullPointerException
java.lang.NullPointerException
at com.liferay.portal.kernel.deploy.hot.HotDeployUtil.reset(HotDeployUtil.java:53)
at com.liferay.portal.spring.context.PortalContextLoaderListener.contextDestroyed(PortalContextLoaderListener.java:139)
at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:4859)
at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5478)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:224)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:159)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:585)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1794)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
13:55:57,542 ERROR [localhost-startStop-1][PortalContextLoaderListener:114] java.lang.IllegalStateException: The system has not be activated yet.
java.lang.IllegalStateException: The system has not be activated yet.
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.setStartLevel(ModuleContainer.java:1442)
at com.liferay.portal.bootstrap.ModuleFrameworkImpl.stopRuntime(ModuleFrameworkImpl.java:515)
liferay7 ce不支持Oracle（和其他商业DB）。检查本文和支持DB的列表的参考文献，以及再次添加Oracle支持的方法，或尝试使用支持商业数据库的Liferay DXP。