Importing a backup into Oracle triggers "SQLSyntaxErrorException: ORA-00955: name is already used by an existing object"

2015-05-19 11:42:07,070 ERROR [localhost-startStop-1] [atlassian.plugin.loaders.ScanningPluginLoader] deployPluginFromUnit Because of the following exception:
java.lang.IllegalArgumentException: The artifact URI file:/Users/ldally/instances/confluences/5.5.3oracletest/webapps/../confluence/WEB-INF/atlassian-bundled-plugins/activeobjects-plugin-0.25.2/ is not a valid plugin artifact
	at com.atlassian.plugin.DefaultPluginArtifactFactory.create(DefaultPluginArtifactFactory.java:70)
	at com.atlassian.plugin.loaders.ScanningPluginLoader.deployPluginFromUnit(ScanningPluginLoader.java:151)
	at com.atlassian.plugin.loaders.ScanningPluginLoader.loadAllPlugins(ScanningPluginLoader.java:89)
	at com.atlassian.plugin.loaders.PermissionCheckingPluginLoader.loadAllPlugins(PermissionCheckingPluginLoader.java:24)
	at com.atlassian.plugin.manager.DefaultPluginManager.init(DefaultPluginManager.java:250)
	at com.atlassian.confluence.plugin.ConfluencePluginManager.init(ConfluencePluginManager.java:123)
	at com.atlassian.confluence.plugin.PluginFrameworkContextListener.contextInitialized(PluginFrameworkContextListener.java:54)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
	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)
2015-05-19 11:42:13,465 WARN [ThreadPoolAsyncTaskExecutor::Thread 7] [org.springframework.beans.TypeConverterDelegate] findDefaultEditor PropertyEditor [com.sun.beans.editors.EnumEditor] found through deprecated global PropertyEditorManager fallback - consider using a more isolated form of registration, e.g. on the BeanWrapper/BeanFactory!
2015-05-19 11:42:14,424 WARN [ThreadPoolAsyncTaskExecutor::Thread 9] [org.springframework.beans.TypeConverterDelegate] findDefaultEditor PropertyEditor [com.sun.beans.editors.EnumEditor] found through deprecated global PropertyEditorManager fallback - consider using a more isolated form of registration, e.g. on the BeanWrapper/BeanFactory!
2015-05-19 11:42:14,426 WARN [ThreadPoolAsyncTaskExecutor::Thread 9] [org.springframework.beans.TypeConverterDelegate] findDefaultEditor PropertyEditor [com.sun.beans.editors.EnumEditor] found through deprecated global PropertyEditorManager fallback - consider using a more isolated form of registration, e.g. on the BeanWrapper/BeanFactory!
2015-05-19 11:42:14,427 WARN [ThreadPoolAsyncTaskExecutor::Thread 9] [org.springframework.beans.TypeConverterDelegate] findDefaultEditor PropertyEditor [com.sun.beans.editors.EnumEditor] found through deprecated global PropertyEditorManager fallback - consider using a more isolated form of registration, e.g. on the BeanWrapper/BeanFactory!
2015-05-19 11:42:14,427 WARN [ThreadPoolAsyncTaskExecutor::Thread 9] [org.springframework.beans.TypeConverterDelegate] findDefaultEditor PropertyEditor [com.sun.beans.editors.EnumEditor] found through deprecated global PropertyEditorManager fallback - consider using a more isolated form of registration, e.g. on the BeanWrapper/BeanFactory!
2015-05-19 11:42:14,428 WARN [ThreadPoolAsyncTaskExecutor::Thread 9] [org.springframework.beans.TypeConverterDelegate] findDefaultEditor PropertyEditor [com.sun.beans.editors.EnumEditor] found through deprecated global PropertyEditorManager fallback - consider using a more isolated form of registration, e.g. on the BeanWrapper/BeanFactory!
2015-05-19 11:42:14,429 WARN [ThreadPoolAsyncTaskExecutor::Thread 9] [org.springframework.beans.TypeConverterDelegate] findDefaultEditor PropertyEditor [com.sun.beans.editors.EnumEditor] found through deprecated global PropertyEditorManager fallback - consider using a more isolated form of registration, e.g. on the BeanWrapper/BeanFactory!
2015-05-19 11:42:14,431 WARN [ThreadPoolAsyncTaskExecutor::Thread 9] [org.springframework.beans.TypeConverterDelegate] findDefaultEditor PropertyEditor [com.sun.beans.editors.EnumEditor] found through deprecated global PropertyEditorManager fallback - consider using a more isolated form of registration, e.g. on the BeanWrapper/BeanFactory!
2015-05-19 11:42:23,375 WARN [localhost-startStop-1] [atlassian.soy.renderer.SoyResourceModuleDescriptor] enabled soy-resource is deprecated. Please convert com.atlassian.confluence.plugins.soy:soy-core-functions to a web-resource and/or a soy-function
2015-05-19 11:42:25,309 ERROR [active-objects-ddl-0] [net.java.ao.sql] handleUpdateError Exception executing SQL update <CREATE TABLE "AO_DC98AE_AOHELP_TIP" (
    "DISMISSED_HELP_TIP" VARCHAR(255),
    "ID" NUMBER(11) NOT NULL,
    "USER_KEY" VARCHAR(255),
    PRIMARY KEY("ID")
)>
java.sql.SQLSyntaxErrorException: ORA-00955: name is already used by an existing object

	at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:447)
	at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:396)
	at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:951)
	at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:513)
	at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:227)
	at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
	at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:195)
	at oracle.jdbc.driver.T4CStatement.executeForRows(T4CStatement.java:1036)
	at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1336)
	at oracle.jdbc.driver.OracleStatement.executeUpdateInternal(OracleStatement.java:1845)
	at oracle.jdbc.driver.OracleStatement.executeUpdate(OracleStatement.java:1810)
	at oracle.jdbc.driver.OracleStatementWrapper.executeUpdate(OracleStatementWrapper.java:294)
	at com.mchange.v2.c3p0.impl.NewProxyStatement.executeUpdate(NewProxyStatement.java:64)
	at net.java.ao.DatabaseProvider.executeUpdate(DatabaseProvider.java:2309)
	at net.java.ao.DatabaseProvider.executeUpdateForAction(DatabaseProvider.java:2379)
	at net.java.ao.DatabaseProvider.executeUpdatesForActions(DatabaseProvider.java:2342)
	at net.java.ao.schema.SchemaGenerator.migrate(SchemaGenerator.java:99)
	at net.java.ao.EntityManager.migrate(EntityManager.java:128)
	at com.atlassian.activeobjects.internal.EntityManagedActiveObjects.migrate(EntityManagedActiveObjects.java:48)
	at com.atlassian.activeobjects.internal.AbstractActiveObjectsFactory$1.doInTransaction(AbstractActiveObjectsFactory.java:65)
	at com.atlassian.activeobjects.internal.AbstractActiveObjectsFactory$1.doInTransaction(AbstractActiveObjectsFactory.java:59)
	at com.atlassian.sal.core.transaction.HostContextTransactionTemplate$1.doInTransaction(HostContextTransactionTemplate.java:25)
	at com.atlassian.sal.spring.component.SpringHostContextAccessor$1.doInTransaction(SpringHostContextAccessor.java:88)
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
	at com.atlassian.sal.spring.component.SpringHostContextAccessor.doInTransaction(SpringHostContextAccessor.java:82)
	at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)
	at com.sun.proxy.$Proxy217.doInTransaction(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.atlassian.plugin.osgi.bridge.external.HostComponentFactoryBean$DynamicServiceInvocationHandler.invoke(HostComponentFactoryBean.java:154)
	at com.sun.proxy.$Proxy217.doInTransaction(Unknown Source)
	at com.atlassian.sal.core.transaction.HostContextTransactionTemplate.execute(HostContextTransactionTemplate.java:21)
	at sun.reflect.GeneratedMethodAccessor108.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
	at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
	at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:62)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:56)
	at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:39)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.osgi.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:59)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at com.sun.proxy.$Proxy941.execute(Unknown Source)
	at com.atlassian.activeobjects.internal.AbstractActiveObjectsFactory.create(AbstractActiveObjectsFactory.java:58)
	at com.atlassian.activeobjects.internal.DelegatingActiveObjectsFactory.create(DelegatingActiveObjectsFactory.java:40)
	at com.atlassian.activeobjects.osgi.ActiveObjectsServiceFactory.createActiveObjects(ActiveObjectsServiceFactory.java:160)
	at com.atlassian.activeobjects.osgi.ActiveObjectsServiceFactory.access$1100(ActiveObjectsServiceFactory.java:51)
	at com.atlassian.activeobjects.osgi.ActiveObjectsServiceFactory$6.call(ActiveObjectsServiceFactory.java:224)
	at com.atlassian.activeobjects.osgi.ActiveObjectsServiceFactory$6.call(ActiveObjectsServiceFactory.java:216)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)