groovy.lang.MissingMethodException during mvn grails:test-app

Hello
I have domain object Server. During bootstrap following code is called

Code:

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serverUrl = Server.get(1)?.url

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Following command is executed during app build

Quote:

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mvn -Dgrails.env=devTest clean -e && mvn -Dgrails.env=test grails:test-app -e && mvn -Dgrails.env=devTest grails:maven-war -e

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Sometimes grails:test-app failures with error grails:test-app groovy.lang.MissingMethodException on method Server.get. This problem happens only sometimes and only during app build