java.lang.AbstractMethodError
at org.codehaus.jackson.map.AnnotationIntrospector$Pair.findSerializer(AnnotationIntrospector.java:1148)
at org.codehaus.jackson.map.ser.BasicSerializerFactory.findSerializerFromAnnotation(BasicSerializerFactory.java:366)
at org.codehaus.jackson.map.ser.BeanSerializerFactory.createSerializer(BeanSerializerFactory.java:252)
at org.codehaus.jackson.map.ser.StdSerializerProvider._createUntypedSerializer(StdSerializerProvider.java:782)
at org.codehaus.jackson.map.ser.StdSerializerProvider._createAndCacheUntypedSerializer(StdSerializerProvider.java:735)
at org.codehaus.jackson.map.ser.StdSerializerProvider.findValueSerializer(StdSerializerProvider.java:344)
at org.codehaus.jackson.map.ser.StdSerializerProvider.findTypedValueSerializer(StdSerializerProvider.java:420)
at org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:601)
at org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:256)
at org.codehaus.jackson.map.ObjectMapper.writeValue(ObjectMapper.java:1613)




SOLUTION: The jackson dependencies are wrong. In my case, I was importing 1.9.9 by mistake