[SLING-6299] SCD ClassCastException ServiceRegistration cannot be cast to Comparable

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Content Distribution Core 0.1.18
• Fix Version/s: Content Distribution Core 0.2.0
• Component/s: Content Distribution
• Assignee: Timothee Maret
• Reporter: Julian Sedding
• Created: 17/Nov/16 11:40
• Updated: 14/Feb/17 09:30
• Resolved: 17/Nov/16 15:13

Description

The following exception was observed:

java.lang.ClassCastException: org.apache.felix.framework.ServiceRegistrationImpl cannot be cast to java.lang.Comparable
        at java.util.concurrent.PriorityBlockingQueue.siftUpComparable(PriorityBlockingQueue.java:357)
        at java.util.concurrent.PriorityBlockingQueue.offer(PriorityBlockingQueue.java:489)
        at org.apache.sling.distribution.monitor.impl.MonitoringDistributionPackageBuilder.registerDistributionPackageMBean(MonitoringDistributionPackageBuilder.java:119)
        at org.apache.sling.distribution.monitor.impl.MonitoringDistributionPackageBuilder.createPackage(MonitoringDistributionPackageBuilder.java:65)
        at org.apache.sling.distribution.serialization.impl.vlt.VaultDistributionPackageBuilderFactory.createPackage(VaultDistributionPackageBuilderFactory.java:260)
        at org.apache.sling.distribution.packaging.impl.exporter.LocalDistributionPackageExporter.exportPackages(LocalDistributionPackageExporter.java:45)
        at org.apache.sling.distribution.agent.impl.SimpleDistributionAgent.exportPackages(SimpleDistributionAgent.java:214)
        at org.apache.sling.distribution.agent.impl.SimpleDistributionAgent.execute(SimpleDistributionAgent.java:182)
        at org.apache.sling.distribution.servlet.DistributionAgentServlet.doPost(DistributionAgentServlet.java:62)
        at org.apache.sling.api.servlets.SlingAllMethodsServlet.mayService(SlingAllMethodsServlet.java:149)
        at org.apache.sling.api.servlets.SlingSafeMethodsServlet.service(SlingSafeMethodsServlet.java:346)

This is due to a violation of the contract of PriorityBlockingQueue, which expects Comparable objects OR a Comparator. ServiceRegistration is not comparable.