Universal Plugin Manager stops working after upgrading it to version 2.7 or greater
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Symptoms
Updates cannot be retrieved for plugins nor can new plugins be browsed via the Universal Plugin Manager.
The following appears in the atlassian-confluence.log:
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2012-10-23 11:04:50,830 ERROR [scheduler_Worker-2] [org.quartz.core.JobRunShell] run Job pluginSchedulerJobGroup.NotificationCacheUpdateJob-job threw an unhandled Exception:
java.lang.NoClassDefFoundError: org/ietf/jgss/GSSException
at org.apache.http.impl.auth.SPNegoSchemeFactory.newInstance(SPNegoSchemeFactory.java:55)
at org.apache.http.auth.AuthSchemeRegistry.getAuthScheme(AuthSchemeRegistry.java:114)
at org.apache.http.impl.client.AuthenticationStrategyImpl.select(AuthenticationStrategyImpl.java:180)
at org.apache.http.impl.client.HttpAuthenticator.authenticate(HttpAuthenticator.java:139)
at org.apache.http.impl.client.DefaultRequestDirector.createTunnelToTarget(DefaultRequestDirector.java:913)
at org.apache.http.impl.client.DefaultRequestDirector.establishRoute(DefaultRequestDirector.java:818)
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:644)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:479)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
at org.apache.http.impl.client.cache.CachingHttpClient.callBackend(CachingHttpClient.java:720)
at org.apache.http.impl.client.cache.CachingHttpClient.handleCacheMiss(CachingHttpClient.java:502)
at org.apache.http.impl.client.cache.CachingHttpClient.execute(CachingHttpClient.java:434)
at org.apache.http.impl.client.cache.CachingHttpClient.execute(CachingHttpClient.java:353)
at com.atlassian.marketplace.client.impl.CommonsHttpHelper.executeMethod(CommonsHttpHelper.java:143)
at com.atlassian.marketplace.client.impl.CommonsHttpHelper.get(CommonsHttpHelper.java:86)
at com.atlassian.marketplace.client.impl.DefaultMarketplaceClient.getEntity(DefaultMarketplaceClient.java:118)
at com.atlassian.marketplace.client.impl.DefaultMarketplaceClient.getRoot(DefaultMarketplaceClient.java:113)
at com.atlassian.marketplace.client.impl.DefaultMarketplaceClient.applications(DefaultMarketplaceClient.java:98)
at com.atlassian.upm.pac.PacClientImpl.unknown(PacClientImpl.java:181)
at com.atlassian.upm.pac.PacClientImpl.forgetPacReachableState(PacClientImpl.java:212)
at com.atlassian.upm.notification.cache.NotificationCacheUpdaterImpl.updatePluginUpdateNotification(NotificationCacheUpdaterImpl.java:91)
at com.atlassian.upm.notification.cache.NotificationCacheUpdaterImpl.updateAllNotifications(NotificationCacheUpdaterImpl.java:62)
at com.atlassian.upm.notification.cache.NotificationCacheUpdateScheduler$NotificationCacheUpdateJob.execute(NotificationCacheUpdateScheduler.java:78)
at com.atlassian.sal.confluence.scheduling.ConfluencePluginScheduler$ConfluencePluginJob.execute(ConfluencePluginScheduler.java:99)
at org.quartz.core.JobRunShell.run(JobRunShell.java:199)
at com.atlassian.confluence.schedule.quartz.ConfluenceQuartzThreadPool$1.run(ConfluenceQuartzThreadPool.java:20)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)
Caused by: java.lang.ClassNotFoundException: org.ietf.jgss.GSSException
at org.apache.felix.framework.ModuleImpl.findClassOrResourceByDelegation(ModuleImpl.java:772)
at org.apache.felix.framework.ModuleImpl.access$200(ModuleImpl.java:73)
at org.apache.felix.framework.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1690)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 27 more
Cause
There is an NTLM based proxy in place between Confluence and the internet
Workaround
The Cntlm Authentication Proxy can be used to forward requests coming from Confluence through the proxy
Resolution
As NTLM proxies are not supported for Confluence, a solution within the product is not guaranteed. See the bug report, When using NTLM proxy, NoClassDefFoundError for class /ietf/jgss/GSSException, for more details.
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