java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException: 	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:169)	at org.apache.torque.adapter.DBFactory.create(DBFactory.java:165)	at org.apache.torque.TorqueInstance.initAdapters(TorqueInstance.java:273)	at org.apache.torque.TorqueInstance.initialize(TorqueInstance.java:155)	at org.apache.torque.TorqueInstance.init(TorqueInstance.java:486)	at org.apache.torque.TorqueInstance.init(TorqueInstance.java:466)	at org.apache.torque.avalon.TorqueComponent.initialize(TorqueComponent.java:182)	at org.apache.avalon.framework.container.ContainerUtil.initialize(ContainerUtil.java:244)	at org.apache.avalon.excalibur.component.DefaultComponentFactory.newInstance(DefaultComponentFactory.java:297)	at org.apache.avalon.excalibur.component.ThreadSafeComponentHandler.initialize(ThreadSafeComponentHandler.java:108)	at org.apache.avalon.excalibur.component.ExcaliburComponentManager.initialize(ExcaliburComponentManager.java:524)	at org.apache.turbine.services.avaloncomponent.TurbineAvalonComponentService.initialize(TurbineAvalonComponentService.java:181)	at org.apache.turbine.services.avaloncomponent.TurbineAvalonComponentService.init(TurbineAvalonComponentService.java:101)	at org.apache.turbine.services.BaseServiceBroker.initService(BaseServiceBroker.java:286)	at org.apache.turbine.services.BaseServiceBroker.doInitService(BaseServiceBroker.java:366)	at org.apache.turbine.services.BaseServiceBroker.initServices(BaseServiceBroker.java:338)	at org.apache.turbine.services.BaseServiceBroker.init(BaseServiceBroker.java:155)	at org.apache.turbine.Turbine.configure(Turbine.java:377)	at org.apache.turbine.Turbine.init(Turbine.java:194)	at javax.servlet.GenericServlet.init(GenericServlet.java:211)	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1105)	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:932)	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3951)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4225)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)	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:597)	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)