Issue
Beekeeper Upgrade Assistant shows "Beekeeper is not available".
The logs shows something similar to:
2019-03-17 20:08:06.830+0000 [id=249] WARNING h.ExpressionFactory2$JexlExpression#evaluate: Caught exception evaluating: it.viewData in /beekeeper/. Reason: java.lang.reflect.InvocationTargetException
java.lang.NullPointerException
at com.cloudbees.jenkins.plugins.assurance.UpgradeAction.inProgressSummary(UpgradeAction.java:592)
at com.cloudbees.jenkins.plugins.assurance.UpgradeAction.getViewData(UpgradeAction.java:565)
at com.cloudbees.jenkins.plugins.assurance.UpgradeAction.getSectionSummary(UpgradeAction.java:625)
at com.cloudbees.jenkins.plugins.assurance.CloudBeesAssurance$ViewData.<init>(CloudBeesAssurance.java:709)
at com.cloudbees.jenkins.plugins.assurance.CloudBeesAssurance$ViewData.<init>(CloudBeesAssurance.java:688)
at com.cloudbees.jenkins.plugins.assurance.CloudBeesAssurance.getViewData(CloudBeesAssurance.java:655)
...
Environment
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CloudBees CI (CloudBees Core) on modern cloud platforms - Managed controller
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CloudBees CI (CloudBees Core) on modern cloud platforms - Operations Center
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CloudBees CI (CloudBees Core) on traditional platforms - Client controller
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CloudBees CI (CloudBees Core) on traditional platforms - Operations Center
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CloudBees Jenkins Enterprise
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CloudBees Jenkins Enterprise - Managed controller
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CloudBees Jenkins Enterprise - Operations center