Why do I receive lots of Warnings on Build reads

Issue

  • Jenkins logs have multiple occurrences of stack trace which shows WARNING: Request processing failed.
    Caused by: com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$UnknownFieldException: No such field 
    ...
    ...
    -------
     field               : [nameOfThefield]
     class               : [Missingtag]
     required-type       : [Required type]
     converter-type      : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
     path                : [Path to the field in the XML File]
     line number         : [line in the xml file containing the tag]
     version             : not available
    -------------------------------
    

Environment

  • CloudBees Jenkins Platform (Legacy)

Resolution

The symptoms above can be related to several different causes:

Memory Issues

Your instance works perfectly, but suddenly starts throwing these warnings in the logs and finally degrades so that a restart is needed.

  • You have to correct the GC and memory settings for your instance, as well as adjust parameters. These parameters are described in the article Prepare Jenkins for Support

Plugin version mismatch

You upgraded some plugins, used them in your builds and then downgraded them.

  • In this case the resolution is related to the detection of the plugin that is failing, usually by reviewing the missing field, and upgrading the plugin to a version including it.
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