java.lang.NullPointerException: Cannot get property 'identifier' on null object

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Cannot get property 'identifier' on null object
java.lang.NullPointerException: Cannot get property 'identifier' on null object
at grails.plugin.gson.adapters.GrailsDomainSerializer.eachProperty(GrailsDomainSerializer.groovy:66)
at grails.plugin.gson.adapters.GrailsDomainSerializer.eachUnvisitedProperty(GrailsDomainSerializer.groovy:51)
at grails.plugin.gson.adapters.GrailsDomainSerializer.serialize(GrailsDomainSerializer.groovy:27)
at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:70)
at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:63)
at com.google.gson.Gson.toJson(Gson.java:586)
at com.google.gson.Gson.toJsonTree(Gson.java:479)
at grails.plugin.gson.adapters.GrailsDomainSerializer$_serialize_closure1.doCall(GrailsDomainSerializer.groovy:44)
at grails.plugin.gson.adapters.GrailsDomainSerializer$_eachUnvisitedProperty_closure2.doCall(GrailsDomainSerializer.groovy:59)
at grails.plugin.gson.adapters.GrailsDomainSerializer.eachProperty(GrailsDomainSerializer.groovy:70)
at grails.plugin.gson.adapters.GrailsDomainSerializer.eachUnvisitedProperty(GrailsDomainSerializer.groovy:51)
at grails.plugin.gson.adapters.GrailsDomainSerializer.serialize(GrailsDomainSerializer.groovy:27)
at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:70)
at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:63)
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:96)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:60)
at com.google.gson.Gson.toJson(Gson.java:586)
at com.google.gson.Gson.toJsonTree(Gson.java:479)
at grails.plugin.gson.adapters.GrailsDomainSerializer$_serialize_closure1.doCall(GrailsDomainSerializer.groovy:44)
at grails.plugin.gson.adapters.GrailsDomainSerializer$_eachUnvisitedProperty_closure2.doCall(GrailsDomainSerializer.groovy:56)
at grails.plugin.gson.adapters.GrailsDomainSerializer.eachProperty(GrailsDomainSerializer.groovy:70)
at grails.plugin.gson.adapters.GrailsDomainSerializer.eachUnvisitedProperty(GrailsDomainSerializer.groovy:51)
at grails.plugin.gson.adapters.GrailsDomainSerializer.serialize(GrailsDomainSerializer.groovy:27)
at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:70)
at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:63)
at com.google.gson.Gson.toJson(Gson.java:586)
at com.google.gson.Gson.toJsonTree(Gson.java:479)
at grails.plugin.gson.adapters.GrailsDomainSerializer$_serialize_closure1.doCall(GrailsDomainSerializer.groovy:44)
at grails.plugin.gson.adapters.GrailsDomainSerializer$_eachUnvisitedProperty_closure2.doCall(GrailsDomainSerializer.groovy:56)
at grails.plugin.gson.adapters.GrailsDomainSerializer.eachProperty(GrailsDomainSerializer.groovy:70)
at grails.plugin.gson.adapters.GrailsDomainSerializer.eachUnvisitedProperty(GrailsDomainSerializer.groovy:51)
at grails.plugin.gson.adapters.GrailsDomainSerializer.serialize(GrailsDomainSerializer.groovy:27)
at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:70)
at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:63)
at com.google.gson.Gson.toJson(Gson.java:586)
at com.google.gson.Gson.toJsonTree(Gson.java:479)
at grails.plugin.gson.adapters.GrailsDomainSerializer$_serialize_closure1.doCall(GrailsDomainSerializer.groovy:35)
at grails.plugin.gson.adapters.GrailsDomainSerializer$_eachUnvisitedProperty_closure2.doCall(GrailsDomainSerializer.groovy:59)
at grails.plugin.gson.adapters.GrailsDomainSerializer.eachProperty(GrailsDomainSerializer.groovy:70)
at grails.plugin.gson.adapters.GrailsDomainSerializer.eachUnvisitedProperty(GrailsDomainSerializer.groovy:51)
at grails.plugin.gson.adapters.GrailsDomainSerializer.serialize(GrailsDomainSerializer.groovy:27)
at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:70)
at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:63)
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:96)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:60)
at com.google.gson.Gson.toJson(Gson.java:586)
at com.google.gson.Gson.toJsonTree(Gson.java:479)
at grails.plugin.gson.adapters.GrailsDomainSerializer$_serialize_closure1.doCall(GrailsDomainSerializer.groovy:35)
at grails.plugin.gson.adapters.GrailsDomainSerializer$_eachUnvisitedProperty_closure2.doCall(GrailsDomainSerializer.groovy:56)
at grails.plugin.gson.adapters.GrailsDomainSerializer.eachProperty(GrailsDomainSerializer.groovy:70)
at grails.plugin.gson.adapters.GrailsDomainSerializer.eachUnvisitedProperty(GrailsDomainSerializer.groovy:51)
at grails.plugin.gson.adapters.GrailsDomainSerializer.serialize(GrailsDomainSerializer.groovy:27)
at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:70)
at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:63)
at com.google.gson.Gson.toJson(Gson.java:586)
at com.google.gson.Gson.toJson(Gson.java:565)
at com.google.gson.Gson.toJson(Gson.java:540)
at grails.plugin.gson.converters.GSON.render(GSON.groovy:49)
at grails.plugin.gson.converters.GSON.render(GSON.groovy:58)
at grails.plugin.gson.api.ArtefactEnhancer$_enhanceControllers_closure1.doCall(ArtefactEnhancer.groovy:29)
at com.aire.pei.TestingController.gsontest(TestingController.groovy:166)
at grails.plugin.cache.web.filter.PageFragmentCachingFilter.doFilter(PageFragmentCachingFilter.java:195)
at grails.plugin.cache.web.filter.AbstractFilter.doFilter(AbstractFilter.java:63)
at org.apache.shiro.grails.SavedRequestFilter.doFilter(SavedRequestFilter.java:55)
at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:380)
at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)

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