grails.web.mapping.exceptions.UrlMappingException: Unable to establish controller name to dispatch for [null]. Dynamic closure invocation returned null. Check your mapping file is correct, when assigning the controller name as a request parameter it cannot be an optional token!

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    Grails 3: redirect doesn't work in UrlMappings.groovy

    GitHub | 2 years ago | SmirnoffYM
    grails.web.mapping.exceptions.UrlMappingException: Unable to establish controller name to dispatch for [null]. Dynamic closure invocation returned null. Check your mapping file is correct, when assigning the controller name as a request parameter it cannot be an optional token!
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    Error in Urlmappings.groovy with static resources

    GitHub | 10 months ago | rbatllet
    grails.web.mapping.exceptions.UrlMappingException: Unable to establish controller name to dispatch for [null]. Dynamic closure invocation returned null. Check your mapping file is correct, when assigning the controller name as a request parameter it cannot be an optional token!
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    Rendering static file as URI in Grails 3

    Stack Overflow | 8 months ago | Shashank Agrawal
    grails.web.mapping.exceptions.UrlMappingException: Unable to establish controller name to dispatch for [null]. Dynamic closure invocation returned null. Check your mapping file is correct, when assigning the controller name as a request parameter it cannot be an optional token!
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    Root Cause Analysis

    1. grails.web.mapping.exceptions.UrlMappingException

      Unable to establish controller name to dispatch for [null]. Dynamic closure invocation returned null. Check your mapping file is correct, when assigning the controller name as a request parameter it cannot be an optional token!

      at java.util.concurrent.ThreadPoolExecutor.runWorker()
    2. Java RT
      Thread.run
      1. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
      2. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      3. java.lang.Thread.run(Thread.java:745)
      3 frames