我有一个标准的Grails 3应用程序，其中我将application.groovy文件添加到grails-app / conf目录。该文件包含以下形式的闭包：
a = {
b = 1
}
当我向Spring Boot Actuator提供的/ env端点提交GET请求时，响应JSON格式不正确。它包含已成功序列化的JSON，直到对象无法序列化，并且似乎附加了错误消息序列化。
我在控制台中获得以下堆栈跟踪：
ERROR org.grails.web.errors.GrailsExceptionResolver - JsonMappingException occurred when processing request: [GET] /env
No serializer found for class groovy.lang.GroovyClassLoader$1 and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.LinkedHashMap["applicationConfig: [classpath:/application.groovy]#development"]->java.util.LinkedHashMap["a"]->_run_closure1["delegate"]->script14676936485701338056614["binding"]->groovy.util.ConfigBinding["callable"]->groovy.util._parse_closure6["delegate"]->groovy.util.ConfigSlurper["classLoader"]->groovy.lang.GroovyClassLoader["resourceLoader"]). Stacktrace follows:
org.springframework.http.converter.HttpMessageNotWritableException: Could not write content: No serializer found for class groovy.lang.GroovyClassLoader$1 and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.LinkedHashMap["applicationConfig: [classpath:/application.groovy]#development"]->java.util.LinkedHashMap["a"]->_run_closure1["delegate"]->script14676936485701338056614["binding"]->groovy.util.ConfigBinding["callable"]->groovy.util._parse_closure6["delegate"]->groovy.util.ConfigSlurper["classLoader"]->groovy.lang.GroovyClassLoader["resourceLoader"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class groovy.lang.GroovyClassLoader$1 and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.LinkedHashMap["applicationConfig: [classpath:/application.groovy]#development"]->java.util.LinkedHashMap["a"]->_run_closure1["delegate"]->script14676936485701338056614["binding"]->groovy.util.ConfigBinding["callable"]->groovy.util._parse_closure6["delegate"]->groovy.util.ConfigSlurper["classLoader"]->groovy.lang.GroovyClassLoader["resourceLoader"])
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_51]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_51]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_51]
Caused by: com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class groovy.lang.GroovyClassLoader$1 and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.LinkedHashMap["applicationConfig: [classpath:/application.groovy]#development"]->java.util.LinkedHashMap["a"]->_run_closure1["delegate"]->script14676936485701338056614["binding"]->groovy.util.ConfigBinding["callable"]->groovy.util._parse_closure6["delegate"]->groovy.util.ConfigSlurper["classLoader"]->groovy.lang.GroovyClassLoader["resourceLoader"])
at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:59) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:26) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:505) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:639) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:505) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:639) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:505) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:639) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:505) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:639) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:505) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:639) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:505) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:639) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:491) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:412) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:27) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:491) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:412) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:27) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:128) ~[jackson-databind-2.4.6.jar:2.4.6]
at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:1902) ~[jackson-databind-2.4.6.jar:2.4.6]
... 3 common frames omitted
我已尝试在堆栈跟踪中指示的情况下禁用Jackson的空bean选项失败，但未成功。我按照http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#howto-customize-the-jackson-objectmapper的建议尝试将spring.jackson.serialization.fail_on_empty_beans属性指定为false，但这没有用，我看到了相同的堆栈跟踪。
如何禁用空豆失败选项或不将闭包序列化到Spring Boot Actuator的/ env端点？