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Can not write a field name, expecting a value
com.fasterxml.jackson.core.JsonGenerationException: Can not write a field name, expecting a value	at com.fasterxml.jackson.core.JsonGenerator._reportError(JsonGenerator.java:1676)	at com.fasterxml.jackson.dataformat.xml.ser.ToXmlGenerator.writeFieldName(ToXmlGenerator.java:444)	at com.fasterxml.jackson.core.JsonGenerator.writeArrayFieldStart(JsonGenerator.java:1409)	at undefined.Playground$ObjectListSerializer.serialize(Playground.java:89)	at undefined.Playground$ObjectListSerializer.serialize(Playground.java:85)	at com.fasterxml.jackson.dataformat.xml.ser.XmlBeanPropertyWriter.serializeAsField(XmlBeanPropertyWriter.java:145)	at com.fasterxml.jackson.dataformat.xml.ser.XmlBeanSerializerBase.serializeFields(XmlBeanSerializerBase.java:202)	at com.fasterxml.jackson.dataformat.xml.ser.XmlBeanSerializer.serialize(XmlBeanSerializer.java:119)	at com.fasterxml.jackson.dataformat.xml.ser.XmlSerializerProvider.serializeValue(XmlSerializerProvider.java:92)	at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3631)	at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:2998)	at undefined.Playground.main(Playground.java:27)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)