我正在将 Alfresco Community 4.0.b 从服务器 1 迁移到服务器 2。两者都是 Ubuntu Server 10.04。我已按照wiki 的说明进行操作，并使用二进制安装文件在两台服务器上安装 Alfresco。
数据库备份和恢复代码：
pg_dump -U postgres -h localhost -p 5432 -F c -v -f alfresco_db alfresco
pg_restore -U postgres -h localhost -p 5432 -C -d postgres -v alfresco_db
在服务器 2 上启动 Alfresco 时，出现以下错误：
2012-08-07 07:50:15,623 ERROR [web.context.ContextLoader] [main] Context initialization failed
java.lang.NullPointerException
at org.alfresco.repo.web.scripts.RepoStore.findNodeRef(RepoStore.java:315)
at org.alfresco.repo.web.scripts.RepoStore$7$1.execute(RepoStore.java:685)
at org.alfresco.repo.web.scripts.RepoStore$7$1.execute(RepoStore.java:682)
at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:388)
at org.alfresco.repo.web.scripts.RepoStore$7.doWork(RepoStore.java:681)
at org.alfresco.repo.web.scripts.RepoStore$7.doWork(RepoStore.java:678)
at org.alfresco.repo.security.authentication.AuthenticationUtil.runAs(AuthenticationUtil.java:519)
at org.alfresco.repo.web.scripts.RepoStore.getDocument(RepoStore.java:677)
at org.springframework.extensions.webscripts.DeclarativeRegistry.initWebScripts(DeclarativeRegistry.java:367)
at org.springframework.extensions.webscripts.DeclarativeRegistry.reset(DeclarativeRegistry.java:178)
at org.springframework.extensions.webscripts.AbstractRuntimeContainer.reset(AbstractRuntimeContainer.java:259)
at org.alfresco.repo.web.scripts.RepositoryContainer.init(RepositoryContainer.java:633)
at org.alfresco.repo.web.scripts.RepositoryContainer$5.execute(RepositoryContainer.java:603)
at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:388)
at org.alfresco.repo.web.scripts.RepositoryContainer.reset(RepositoryContainer.java:598)
at org.alfresco.repo.web.scripts.RepositoryContainer$4.doWork(RepositoryContainer.java:553)
at org.alfresco.repo.security.authentication.AuthenticationUtil.runAs(AuthenticationUtil.java:519)
at org.alfresco.repo.web.scripts.RepositoryContainer.onApplicationEvent(RepositoryContainer.java:557)
at org.alfresco.repo.management.SafeApplicationEventMulticaster.multicastEventInternal(SafeApplicationEventMulticaster.java:209)
at org.alfresco.repo.management.SafeApplicationEventMulticaster.multicastEvent(SafeApplicationEventMulticaster.java:180)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:303)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:911)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:428)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
at org.alfresco.web.app.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:63)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:905)
at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:740)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:500)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
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:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Aug 7, 2012 7:50:15 AM com.sun.xml.ws.transport.http.servlet.WSServletContextListener contextInitialized
INFO: WSSERVLET12: JAX-WS context listener initializing
Aug 7, 2012 7:50:24 AM com.sun.xml.ws.transport.http.servlet.WSServletDelegate <init>
INFO: WSSERVLET14: JAX-WS servlet initializing
Aug 7, 2012 7:50:24 AM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
Aug 7, 2012 7:50:24 AM org.apache.catalina.core.StandardContext start
SEVERE: Context [/alfresco] startup failed due to previous errors
少了什么东西？
已编辑。