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

• CloudBees Core
• CloudBees Core on modern cloud platforms - Managed Master
• CloudBees Core on modern cloud platforms - Operations Center
• CloudBees Core on traditional platforms - Client Master
• CloudBees Core on traditional platforms - Operations Center
• CloudBees Jenkins Enterprise
• CloudBees Jenkins Enterprise - Managed Master
• CloudBees Jenkins Enterprise - Operations Center
• CloudBees Jenkins Platform - Client Master
• CloudBees Jenkins Platform - Operations Center
• CloudBees Jenkins Distribution
• Cloudbees Assurance Plugin

Resolution

1. Delete $JENKINS_HOME/cb-envelope/envelope.json.staged
2. Restart instance