Caused: java.util.concurrent.ExecutionException
        at com.google.common.util.concurrent.AbstractFuture$Sync.getValue(AbstractFuture.java:289)
        at com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:262)
        at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:91)
        at com.google.common.util.concurrent.ForwardingFuture.get(ForwardingFuture.java:69)
        at com.atlassian.jira.rest.client.internal.async.DelegatingPromise.get(DelegatingPromise.java:113)
        at hudson.plugins.jira.JiraRestService.getUser(JiraRestService.java:296)
        at hudson.plugins.jira.JiraMailAddressResolver.findMailAddressFor(JiraMailAddressResolver.java:39)
        at hudson.tasks.MailAddressResolver.resolve(MailAddressResolver.java:125)
        at hudson.tasks.Mailer$UserProperty.getAddress(Mailer.java:706)
        at org.jenkinsci.plugins.gravatar.model.GravatarUser$1.get(GravatarUser.java:20)
        at org.jenkinsci.plugins.gravatar.model.GravatarUser$1.get(GravatarUser.java:14)
        at com.google.common.base.Suppliers$MemoizingSupplier.get(Suppliers.java:109)
        at org.jenkinsci.plugins.gravatar.model.GravatarUser.emailAddress(GravatarUser.java:44)
        at org.jenkinsci.plugins.gravatar.cache.GravatarImageResolutionCacheLoader.load(GravatarImageResolutionCacheLoader.java:43)
        at org.jenkinsci.plugins.gravatar.cache.GravatarImageResolutionCacheLoader.load(GravatarImageResolutionCacheLoader.java:17)
        at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3568)
        at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2350)
        at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2313)
        at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2228)
        at com.google.common.cache.LocalCache.get(LocalCache.java:3965)
        at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3969)
        at com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4829)
        at org.jenkinsci.plugins.gravatar.cache.GravatarImageResolutionLoadingCache.loadIfUnknown(GravatarImageResolutionLoadingCache.java:53)
        at org.jenkinsci.plugins.gravatar.cache.GravatarImageResolutionCacheInstance.loadIfUnknown(GravatarImageResolutionCacheInstance.java:26)
        at org.jenkinsci.plugins.gravatar.cache.PeriodicGravatarImageResolutionCacheFillingWorker.execute(PeriodicGravatarImageResolutionCacheFillingWorker.java:58)
        at hudson.model.AsyncPeriodicWork.lambda$doRun$0(AsyncPeriodicWork.java:100)
        at java.base/java.lang.Thread.run(Thread.java:834)