Gracias por responder Cristina, te explico, cuando subo un documento la primera vez si se crea correctamente, el problema aparece al subir nuevas versiones y ocurre sólo algunas veces. EN el log me aparece el siguiente error:
11:47:06,113 User:fulanito ERROR [repo.transaction.AlfrescoTransactionSupport] After completion (committed) listener exception:
listener: org.alfresco.repo.action.ActionTransactionListener@1c4debb1
java.lang.NullPointerException
at org.alfresco.repo.action.CreateThumbnailActionFilter.compare(CreateThumbnailActionFilter.java:38)
at org.alfresco.repo.action.CreateThumbnailActionFilter.compare(CreateThumbnailActionFilter.java:30)
at org.alfresco.repo.action.AsynchronousActionExecutionQueueImpl.executeAction(AsynchronousActionExecutionQueueImpl.java:275)
at org.alfresco.repo.action.AsynchronousActionExecutionQueueImpl.executeAction(AsynchronousActionExecutionQueueImpl.java:214)
at org.alfresco.repo.action.ActionServiceImpl.queueAction(ActionServiceImpl.java:569)
at org.alfresco.repo.action.ActionServiceImpl.postCommit(ActionServiceImpl.java:556)
at org.alfresco.repo.action.ActionTransactionListener.afterCommit(ActionTransactionListener.java:77)
at org.alfresco.repo.transaction.AlfrescoTransactionSupport$TransactionSynchronizationImpl.afterCompletion(AlfrescoTransactionSupport.java:802)
at org.springframework.transaction.support.TransactionSynchronizationUtils.invokeAfterCompletion(TransactionSynchronizationUtils.java:168)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.invokeAfterCompletion(AbstractPlatformTransactionManager.java:996)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.triggerAfterCompletion(AbstractPlatformTransactionManager.java:971)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:799)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:394)
at org.alfresco.util.transaction.SpringAwareUserTransaction.commit(SpringAwareUserTransaction.java:472)
at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:403)
at org.alfresco.repo.web.scripts.RepositoryContainer.transactionedExecute(RepositoryContainer.java:436)
at org.alfresco.repo.web.scripts.RepositoryContainer.transactionedExecuteAs(RepositoryContainer.java:466)
at org.alfresco.repo.web.scripts.RepositoryContainer.executeScript(RepositoryContainer.java:304)
at org.springframework.extensions.webscripts.AbstractRuntime.executeScript(AbstractRuntime.java:333)
at org.springframework.extensions.webscripts.AbstractRuntime.executeScript(AbstractRuntime.java:189)
at org.springframework.extensions.webscripts.servlet.WebScriptServlet.service(WebScriptServlet.java:118)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.alfresco.web.app.servlet.GlobalLocalizationFilter.doFilter(GlobalLocalizationFilter.java:58)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)