Unable to Serialize RangeSet using asRanges() method after upgrading to jackson 2.8

[nisarakash]

Hi,
I am trying to serialize RangeSet using jackson 2.8 libraries. I am getting the following exception:

Exception in thread "main" com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class java.time.LocalDateTime and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.akash.test.Range.RangeInterval["rangeSet"]->com.google.common.collect.TreeRangeSet$AsRanges[0])
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:284)
at com.fasterxml.jackson.databind.SerializerProvider.mappingException(SerializerProvider.java:1110)
at com.fasterxml.jackson.databind.SerializerProvider.reportMappingProblem(SerializerProvider.java:1135)
at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:69)
at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:32)
at com.fasterxml.jackson.datatype.guava.ser.RangeSerializer._writeContents(RangeSerializer.java:133)
at com.fasterxml.jackson.datatype.guava.ser.RangeSerializer.serialize(RangeSerializer.java:90)
at com.fasterxml.jackson.datatype.guava.ser.RangeSerializer.serialize(RangeSerializer.java:20)
at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContentsUsing(CollectionSerializer.java:176)
at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:120)
at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:112)
at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:25)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:704)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:689)
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155)
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:292)
at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3697)
at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:3073)
at com.akash.test.Range.RangeInterval.main(RangeInterval.java:38)

As per my understanding, it is trying to access the first element (i.e. TreeRangeSet$AsRanges[0]) of the set using index which I guess is not a valid option in the set.

It works great with jackson 2.6 libraries. Can anyone help me out?

[cowtowncoder]

Exception message indicates that you have not added Java 8 date/time module (jackson-datatype-jsr310) -- this module is necessary for serializing java.time.LocalDateTime. If so, you need to add it.

If this is not enough, I would need a test case to reproduce the behavior.

Also: now that 2.9.0 is out, it would make sense to test with that; or, if using 2.8, make sure to use the latest patch version (2.8.9).

[nisarakash]

Hi cowtowncoder,
I had use jackson-datatype-jsr310 - 2.8 in my test. I can serialize the Range, but it fails when I try to use TreeRangeSet. It also fails when I tried TreeRangeSet.
Below is the code I am using to serialize the RangeSet:

public class RangeInterval {
	private RangeSet<LocalDateTime> rangeSet;
	public RangeInterval() {
		rangeSet = TreeRangeSet.create();
		rangeSet.add(Range.closed(LocalDateTime.now().minusDays(5), LocalDateTime.now()));
		rangeSet.add(Range.closed(LocalDateTime.now().minusDays(10), LocalDateTime.now().minusDays(8)));
	}
	
	public Set<Range<LocalDateTime>> getRangeSet() {
		return rangeSet.asRanges();
	}
	public static void main(String[] args) throws JsonProcessingException {
		ObjectMapper mapper = new ObjectMapper();
		mapper.registerModule(new GuavaModule());
		mapper.registerModule(new JavaTimeModule());
		System.out.println(mapper.writeValueAsString(new RangeInterval()));		
	}	
}

[cowtowncoder]

And just to make sure: are you using 2.8.9, and not some earlier patch version?

[nisarakash]

I am using
jackson-core 2.8
jackson-databind 2.8
jackson-annotaions 2.8
jackson-datatype-guava 2.6
jackson-datatype-jsr310 2.6

Can this create dependency issues? If yes can you explain me?

[cowtowncoder]

@nisarakash Yes, it could cause issues: minor versions of components should match. Often some combinations of "close enough" minor versions do work, and I can't say for sure this is what is causing problems, but I would try upgrading all components to 2.8.9.

Note, too, that Jackson releases always use patch version, so while I sometimes refer to 2.8.x to mean all patch versions, there is no Maven version 2.8. Since there are many important fixes throughout minor versions, I would strongly recommend trying upgrade to 2.8.9, beyond going from 2.6.x to 2.8.x.