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java.lang.StackOverflowError: null	at grails.plugin.json.builder.JsonOutput.writeObject(JsonOutput.java:327)	at grails.plugin.json.builder.JsonOutput.writeMap(JsonOutput.java:460)	at grails.plugin.json.builder.JsonOutput.writeObject(JsonOutput.java:331)	at grails.plugin.json.builder.JsonOutput.writeMap(JsonOutput.java:460)