Unexplained NPE in AbstractSlingRepository.pingAndCheck -------------------------------------------------------
Key: SLING-431 URL: https://issues.apache.org/jira/browse/SLING-431 Project: Sling Issue Type: Bug Reporter: Bertrand Delacretaz Priority: Minor I've found this trace in the log of my custom launchpad-based Sling webapp: Exception in thread "Repository Pinger" java.lang.NullPointerException at org.apache.sling.jcr.base.AbstractSlingRepository.pingAndCheck(AbstractSlingRepository.java:481) at org.apache.sling.jcr.base.AbstractSlingRepository.run(AbstractSlingRepository.java:898) at java.lang.Thread.run(Thread.java:613) This happened at startup, but only once with many successful startups with the same code and configuration. The corresponding code line is the log.log call in } catch(RepositoryException re) { log.log(LogService.LOG_INFO, "pingAndCheck; loginAdministrative failed", re); } So the only explanation is that log is null, which is "impossible" looking at the source code: the thread that calls pingAndCheck is created in activate(), which must be called by the OSGi framework after initializing the log member variable: /** @scr.reference bind="bindLog" unbind="unbindLog" */ private LogService log; There is something weird about the log class, in the error log: 07.05.2008 13:20:39.574 *ERROR* [SCR Component Actor] org.apache.sling.jcr.jackrabbit.client [org.apache.sling.jcr.jackrabbit.client.SlingClientRepository] Cannot load class used as parameter org.osgi.service.log.Lo gService (java.lang.ClassNotFoundException: org.osgi.service.log.LogService) java.lang.ClassNotFoundException: org.osgi.service.log.LogService at org.apache.felix.framework.Felix.loadBundleClass(Felix.java:1504) That happens before the above NPE. I won't investigate further for now, but this looks like a weird timing-related bug. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.