Grails 1.1.1 log4j DSL throws MissingMethodException for PatternLayout configuration

Question

I've upgraded a Grails 1.0.3 app to Grails 1.1.1. I've upgraded the log4j configuration in Config.groovy to conform to the new DSL. However, after defining a ConsoleAppender with a PatternLayout, the application won't start, and instead throws a MissingMethodException with the message:

groovy.lang.MissingMethodException: No signature of method: \
groovy.util.ConfigSlurper$_parse_closure5.pattern() is applicable \
for argument types: (java.util.LinkedHashMap) \
values: [[conversionPattern:%d{ISO8601} [%10.10t] [%18.18c] [%5p] - %m%n]]

(I broke the above message into multiple lines for readability).

My configuration is:

environments {
  development {
    log4j {
      appenders {
        console name: 'myAppender',
                layout: pattern(conversionPattern: '%d{ISO8601} [%10.10t] [%18.18c] [%5p] - %m%n')
        ...
      }
      root {
        error 'myAppender'
        additivity = true
      }
      error 'org.codehaus.groovy.grails.plugins',
            'org.codehaus.groovy.grails.orm.hibernate',
      ...
  }
  ...
}

I've tried changing the pattern, adding parentheses for the console() function, but with no success. What's causing this Exception?

Answer 1

Turns out I had missed an equals sign in the configuration. The solution was to change:

log4j {
  ...
}

to

log4j = {
  ...
}

Pretty obvious solution once you see it as compared to the examples in the documentation, but when you're getting errors for specific closures/methods within the DSL, the errors don't make it obvious what the real issue is.