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  1. Solr
  2. SOLR-8876

Morphlines fails with "No command builder registered for ..." when using Java 9 due to morphline "importCommands" config option attempting to resolve classname globs

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      Description

      When running Solr in java9, and using the morphlines contrib(s) users may encounter vague errors such as...

      No command builder registered for COMMAND_NAME
      

      This error comes directly from the morphlines code, and relates to the use of wildcards in the importCommands declaration of of morphlines *.conf files used – for example...

      importCommands : ["org.kitesdk.**", "org.apache.solr.**"]
      

      Using wildcards like * and ** in morphline's importCommands config options do not work in java9 due to changes in the underlying JVM classloader.

      This issue is tracked up stream in: https://github.com/kite-sdk/kite/issues/469


      WORK AROUND

      The workaround is to only use fully qualified command class names in importCommands declaration, one for each distinct command used in that conf file.

      Example:

      # Old config, does not work in java9
      # importCommands : ["org.kitesdk.**", "org.apache.solr.**"]
      
      # replaced with...
      
      # using globs (foo.bar.* or foo.bar.**) will not work in Java9 due to classpath scanning limitations
      # so we enumarate every command (builder) we know this config uses below. (see SOLR-8876)
      importCommands : ["org.kitesdk.morphline.stdlib.LogDebugBuilder",
                        "org.apache.solr.morphlines.solr.SanitizeUnknownSolrFieldsBuilder",
                        "org.apache.solr.morphlines.solr.LoadSolrBuilder"]
      

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              • Assignee:
                hossman Hoss Man
                Reporter:
                thetaphi Uwe Schindler
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                • Created:
                  Updated:
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