Re: [jackson-user] JsonMappingException with jackson-databind version 2.8.0 and higher

2017-03-23 Thread Tatu Saloranta 
Could you please file an issue for `jackson-databind`. Looks like a bug.

-+ Tatu +-

On Thu, Mar 23, 2017 at 5:11 PM, Anuj Kumar  wrote:
>
> I am getting an exception with jackson databind version 2.8.0 and later,
> everything works fine with any version below 2.8.0.
>
> Issue is, if I have a property name with an underscore and the letter after
> it is NOT the same as the first letter, then things blow up.
>
>
> For example I have a Person class which contains a Set which has the
> name as "person_z" which fails.
>
> But if I rename it to "person_p" it works.
>
>
> public class Person {
> @JsonProperty("name")
> private String name;
> @JsonProperty("person_z") // renaming this to person_p works
> @JsonIgnoreProperties(value = {"person_z"}) // renaming this to person_p
> works
> private Set personZ;
> }
>
>
> public class TestJackson {
>
> public static void main(String[] args) throws IOException {
>
> String st =" [ {\n"
> + "\"name\": \"admin\",\n"
> + "\"person_z\": [" // renaming this to person_p works
> + "  {"
> + "\"name\": \"admin\""
> + "  }"
> + "]"
> + "  }]";
>
> ObjectMapper mapper = new ObjectMapper();
> mapper.readValue(st,
> mapper.getTypeFactory().constructCollectionType(List.class, Person.class));
> }
>
> }
>
>
> Exception in thread "main"
> com.fasterxml.jackson.databind.JsonMappingException: No _valueDeserializer
> assigned
>  at [Source:  [ {
> "name": "admin",
> "person_z": [  {"name": "admin"  }]  }]; line: 3,
> column: 41] (through reference chain:
> java.util.ArrayList[0]->com.example.Person["person_z"]->java.util.HashSet[0]->com.example.Person["name"])
>   at
> com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:261)
>   at
> com.fasterxml.jackson.databind.DeserializationContext.reportMappingException(DeserializationContext.java:1233)
>   at
> com.fasterxml.jackson.databind.deser.impl.FailingDeserializer.deserialize(FailingDeserializer.java:27)
>   at
> com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:490)
>   at
> com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:101)
>   at
> com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276)
>   at
> com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140)
>   at
> com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:277)
>   at
> com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:249)
>   at
> com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:26)
>   at
> com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:490)
>   at
> com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:101)
>   at
> com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276)
>   at
> com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140)
>   at
> com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:277)
>   at
> com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:249)
>   at
> com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:26)
>   at
> com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3789)
>   at
> com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2871)
>   at com.example.TestJackson.main(TestJackson.java:28)
>   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>   at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>   at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>   at java.lang.reflect.Method.invoke(Method.java:498)
>   at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
>
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[jackson-user] JsonMappingException with jackson-databind version 2.8.0 and higher

2017-03-23 Thread Anuj Kumar 



I am getting an exception with jackson databind version 2.8.0 and later, 
everything works fine with any version below 2.8.0. 

Issue is, if I have a property name with an underscore and the letter after it 
is NOT the same as the first letter, then things blow up.


For example I have a Person class which contains a Set which has the 
name as "person_z" which fails. 

But if I rename it to "person_p" it works.


public class Person {
@JsonProperty("name")
private String name;
@JsonProperty("person_z") // renaming this to person_p works
@JsonIgnoreProperties(value = {"person_z"}) // renaming this to person_p 
works
private Set personZ;
}


public class TestJackson {

public static void main(String[] args) throws IOException {

String st =" [ {\n"
+ "\"name\": \"admin\",\n"
+ "\"person_z\": [" // renaming this to person_p works
+ "  {"
+ "\"name\": \"admin\""
+ "  }"
+ "]"
+ "  }]";

ObjectMapper mapper = new ObjectMapper();
mapper.readValue(st, 
mapper.getTypeFactory().constructCollectionType(List.class, Person.class));
}

}


Exception in thread "main" com.fasterxml.jackson.databind.JsonMappingException: 
No _valueDeserializer assigned
 at [Source:  [ {
"name": "admin",
"person_z": [  {"name": "admin"  }]  }]; line: 3, 
column: 41] (through reference chain: 
java.util.ArrayList[0]->com.example.Person["person_z"]->java.util.HashSet[0]->com.example.Person["name"])
at 
com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:261)
at 
com.fasterxml.jackson.databind.DeserializationContext.reportMappingException(DeserializationContext.java:1233)
at 
com.fasterxml.jackson.databind.deser.impl.FailingDeserializer.deserialize(FailingDeserializer.java:27)
at 
com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:490)
at 
com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:101)
at 
com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276)
at 
com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140)
at 
com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:277)
at 
com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:249)
at 
com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:26)
at 
com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:490)
at 
com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:101)
at 
com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276)
at 
com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140)
at 
com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:277)
at 
com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:249)
at 
com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:26)
at 
com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3789)
at 
com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2871)
at com.example.TestJackson.main(TestJackson.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

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Re: [jackson-user] How to use type name as element name

2017-03-23 Thread Tatu Saloranta 
On Thu, Mar 23, 2017 at 11:34 AM, Zsolt Balanyi  wrote:
> Hi!
>
> Unfortunately none of the approaches worked... XmlBeanSerializerModifier has
> a bug, and does not use the provided modifier, even if I override the method
> you mentioned.
> Could you help me where to report the bug?

If you can reproduce this without XML backend, it'd make sense to
report against `jackson-databind`.
If this is truly XML specific, then `jackson-dataformat-xml`. I can
help troubleshoot the problem either way, but it would be good to know
if it is XML specific or not.

> Also where can I find some resources on the architecture of the Jackson
> project?

I don't think there is much. I have blogged at

http://cowtowncoder.com/blog/blog.html (older)
https://medium.com/@cowtowncoder (newer)

and jackson-docs repo has some links

https://github.com/FasterXML/jackson-docs/

but most documentation refers to public API developers are most likely to use.

-+ Tatu +-

>
> BR, Zsolt
>
> 2017. március 23., csütörtök 6:45:18 UTC+1 időpontban Tatu Saloranta a
> következőt írta:
>>
>> On Wed, Mar 22, 2017 at 10:24 PM, Zsolt Balanyi 
>> wrote:
>> > Hi!
>> >
>> > Of course my code is related to XML:
>>
>> Right, I just meant it regarding general data-binding functionality.
>> Your code can certainly use its knowledge as necessary.
>>
>> >
>> > ObjectMapper om = new XmlMapper();
>> > om.enable(SerializationFeature.INDENT_OUTPUT);
>> > om.registerModule(new JacksonXmlModule() {
>> > @Override
>> > public void setupModule(SetupContext context) {
>> > super.setupModule(context);
>> > context.addBeanSerializerModifier(new
>> > UIElementSerializerModifier());
>> > }
>> > });
>> >
>> > public class UIElementSerializerModifier extends
>> > XmlBeanSerializerModifier {
>> > @Override
>> > public JsonSerializer modifySerializer(SerializationConfig
>> > config,
>> > BeanDescription beanDesc, JsonSerializer serializer) {
>> > if (UIElement.class.isAssignableFrom(beanDesc.getBeanClass())) {
>> > System.out.println(serializer.getClass().getName());
>> > return new BSerializer((BeanSerializerBase) serializer);
>> > }
>> > return serializer;
>> > }
>> > }
>> >
>> > public class BSerializer extends XmlBeanSerializer {
>> >
>> > public BSerializer(BeanSerializerBase src) {
>> > super(src);
>> > }
>> >
>> > @Override
>> > public void serialize(Object bean, JsonGenerator jgen,
>> > SerializerProvider provider) throws IOException {
>> >   // The breakpoint on next line is never hit!!!
>> >   super.serialize(bean, jgen, provider);
>> > }
>> > }
>> >
>> > I create an object that extends UIElement, the appropriate BSerializer
>> > is
>> > created, but never called.
>> > Is this a bug in jackson-dataformat-xml, or I'm doing wrong something?
>>
>> One possibility is that if the type uses polymorphic handling, method
>> called is actually
>>
>>  public void serializeWithType(T value, JsonGenerator g,
>> SerializerProvider p,
>>   TypeSerializer ts);
>>
>> and you may need to override that as well.
>>
>> -+ Tatu +-
>>
>> >
>> > BR, Zsolt
>> >
>> > 2017. március 22., szerda 23:21:03 UTC+1 időpontban Tatu Saloranta a
>> > következőt írta:
>> >>
>> >> On Wed, Mar 22, 2017 at 1:31 AM, Zsolt Balanyi 
>> >> wrote:
>> >> > Hi!
>> >> >
>> >> > The tag name can be easily renamed, by
>> >> >
>> >> > if (gen instanceof ToXmlGenerator) {
>> >> > ((ToXmlGenerator)gen).setNextName(new
>> >> > QName(bean.getClass().getSimpleName()));
>> >> > }
>> >> > doNormalSerialization();
>> >>
>> >> Yes, but that does not mean much when it's `jackson-databind` and its
>> >> type handling code which can not call such method
>> >> (it is XML specific and not needed for other formats).
>> >>
>> >> > The only problem is, that I need to serialize all other fields, which
>> >> > I
>> >> > dont
>> >> > know how... That is why I would need to get the method to perform the
>> >> > serialization, as the default serializer would.
>> >> > Also, the BeanSerializerModifier approach did not work.
>> >> > The new serializer is only created, but not called during the
>> >> > serialization.
>> >> > Maybe it has to something with the fact that I register it for an
>> >> > abstract
>> >> > class, and the concrete implementors still use their defaults?
>> >>
>> >> BeanSerializerModifier is a callback, but yes, result would be bound
>> >> for whatever type it was called for.
>> >>
>> >> -+ Tatu +-
>> >>
>> >> >
>> >> > BR Zsolt
>> >> >
>> >> >
>> >> >
>> >> > 2017. március 22., szerda 5:38:56 UTC+1 időpontban Tatu Saloranta a
>> >> > következőt írta:
>> >> >>
>> >> >> On Tue, Mar 21, 2017 at 12:16 AM, Zsolt Balanyi
>> >> >> 
>> >> >> wrote:
>> >> >> > Hi!
>> >> >> >
>> >> >> > That was one of

Re: [jackson-user] Ignore property of object in list property of a class

2017-03-23 Thread Tatu Saloranta 
Actually it should already be possible to use `@JsonIgnoreProperties`
for properties as is, but I think it only affects property value
itself, and not contents of containers.
But it seems reasonable to assume that since Lists/arrays/Maps do not
have properties of their own (except in non-standard case of being
serialized "as POJOs"...), this annotation would refer to values. This
is similar to how `@JsonTypeInfo` works.

If there isn't yet an issue to support this, could you please file one
for `jackson-databind`.
I don't know how easy it would be to support this, but conceptually it
seems straightforward.

-+ Tatu +-


On Mon, Mar 20, 2017 at 12:56 AM, Obby Kipchumba  wrote:
> Let;s say you have the following classes.
>
> class Client {
>   List vehicles;
> }
>
>
> Class Vehicle {
>
>
>   Client owner;
> }
>
>
>
> What I want to have is a field level annotation as such.
>
> class Client {
>
>   // something like this
>   @JsonIgnoreProperties (forEach="owner")
>   List vehicles;
> }
>
>
> Class Vehicle {
>
>   @JsonIgnoreProperties ("vehicles")
>   Client owner;
> }
>
>
>
> This is so as to prevent recursion based on the contaxt you are in. I mean
> If I have a client object and i'm getting it's vehicles, i don't want the
> owner details since I already have the client object but when i have a
> vehicle object I will need to know it's owner information but exclude the
> list of the vehicles the client has. Isn't this something that someone has
> needed at some point in time?
>
> When you use at class level, like this
>
> @JsonIgnoreProperties ("owner")
>
> Class Vehicle {
>
>   Client owner;
> }
>
>
> This will ignore  the owner all the time regardless of context. Can the
> above feature be made possible?
>
>
>
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Re: [jackson-user] WRAP_ROOT_VALUE when serializing

2017-03-23 Thread Tatu Saloranta 
You can enable/disable `SerializationFeature`s using `ObjectWriter`
instead of `ObjectMapper`, like so:

byte[] bytes = mapper.writer().with(SerializationFeature.WRAP_ROOT_VALUE)
.writeValueAsBytes(pojo);

I don't know what support Spring Boot offers for doing this.

-+ Tatu +-



On Mon, Mar 20, 2017 at 3:50 PM, shane lee  wrote:
> Hi all,
>
> I have asked this question already on github:
> https://github.com/FasterXML/jackson-databind/issues/1567
>
> What I want is to enable this serilisation feature but only for the pojo i
> have defined using @JsonRootName. Not all other pojos that i serialise. How
> is that possible?
>
> Thanks,
> Shane.
>
>
> Spring boot version 1.4.0.RELEASE
> jackson databind 2.8.1
>
> --
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[jackson-user] Re: Jackson CSV: Edit header at first row of csv

2017-03-23 Thread Silent Jay 
You have to annote the properties:

public class YourClass
{

@JsonProperty("ID")
public int id;


@JsonProperty("Fullname")
public String name;
}

Easiest solution would be to use the same names for the properties of your 
object as in your csv file but I suppose you have your reason for not doing 
this...

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Re: [jackson-user] How to use type name as element name

2017-03-23 Thread Zsolt Balanyi 
Hi!

Unfortunately none of the approaches worked... XmlBeanSerializerModifier 
has a bug, and does not use the provided modifier, even if I override the 
method you mentioned.
Could you help me where to report the bug?
Also where can I find some resources on the architecture of the Jackson 
project?

BR, Zsolt

2017. március 23., csütörtök 6:45:18 UTC+1 időpontban Tatu Saloranta a 
következőt írta:
>
> On Wed, Mar 22, 2017 at 10:24 PM, Zsolt Balanyi  > wrote: 
> > Hi! 
> > 
> > Of course my code is related to XML: 
>
> Right, I just meant it regarding general data-binding functionality. 
> Your code can certainly use its knowledge as necessary. 
>
> > 
> > ObjectMapper om = new XmlMapper(); 
> > om.enable(SerializationFeature.INDENT_OUTPUT); 
> > om.registerModule(new JacksonXmlModule() { 
> > @Override 
> > public void setupModule(SetupContext context) { 
> > super.setupModule(context); 
> > context.addBeanSerializerModifier(new 
> > UIElementSerializerModifier()); 
> > } 
> > }); 
> > 
> > public class UIElementSerializerModifier extends 
> XmlBeanSerializerModifier { 
> > @Override 
> > public JsonSerializer modifySerializer(SerializationConfig 
> config, 
> > BeanDescription beanDesc, JsonSerializer serializer) { 
> > if (UIElement.class.isAssignableFrom(beanDesc.getBeanClass())) { 
> > System.out.println(serializer.getClass().getName()); 
> > return new BSerializer((BeanSerializerBase) serializer); 
> > } 
> > return serializer; 
> > } 
> > } 
> > 
> > public class BSerializer extends XmlBeanSerializer { 
> > 
> > public BSerializer(BeanSerializerBase src) { 
> > super(src); 
> > } 
> > 
> > @Override 
> > public void serialize(Object bean, JsonGenerator jgen, 
> > SerializerProvider provider) throws IOException { 
> >   // The breakpoint on next line is never hit!!! 
> >   super.serialize(bean, jgen, provider); 
> > } 
> > } 
> > 
> > I create an object that extends UIElement, the appropriate BSerializer 
> is 
> > created, but never called. 
> > Is this a bug in jackson-dataformat-xml, or I'm doing wrong something? 
>
> One possibility is that if the type uses polymorphic handling, method 
> called is actually 
>
>  public void serializeWithType(T value, JsonGenerator g, 
> SerializerProvider p, 
>   TypeSerializer ts); 
>
> and you may need to override that as well. 
>
> -+ Tatu +- 
>
> > 
> > BR, Zsolt 
> > 
> > 2017. március 22., szerda 23:21:03 UTC+1 időpontban Tatu Saloranta a 
> > következőt írta: 
> >> 
> >> On Wed, Mar 22, 2017 at 1:31 AM, Zsolt Balanyi  
> >> wrote: 
> >> > Hi! 
> >> > 
> >> > The tag name can be easily renamed, by 
> >> > 
> >> > if (gen instanceof ToXmlGenerator) { 
> >> > ((ToXmlGenerator)gen).setNextName(new 
> >> > QName(bean.getClass().getSimpleName())); 
> >> > } 
> >> > doNormalSerialization(); 
> >> 
> >> Yes, but that does not mean much when it's `jackson-databind` and its 
> >> type handling code which can not call such method 
> >> (it is XML specific and not needed for other formats). 
> >> 
> >> > The only problem is, that I need to serialize all other fields, which 
> I 
> >> > dont 
> >> > know how... That is why I would need to get the method to perform the 
> >> > serialization, as the default serializer would. 
> >> > Also, the BeanSerializerModifier approach did not work. 
> >> > The new serializer is only created, but not called during the 
> >> > serialization. 
> >> > Maybe it has to something with the fact that I register it for an 
> >> > abstract 
> >> > class, and the concrete implementors still use their defaults? 
> >> 
> >> BeanSerializerModifier is a callback, but yes, result would be bound 
> >> for whatever type it was called for. 
> >> 
> >> -+ Tatu +- 
> >> 
> >> > 
> >> > BR Zsolt 
> >> > 
> >> > 
> >> > 
> >> > 2017. március 22., szerda 5:38:56 UTC+1 időpontban Tatu Saloranta a 
> >> > következőt írta: 
> >> >> 
> >> >> On Tue, Mar 21, 2017 at 12:16 AM, Zsolt Balanyi  
>
> >> >> wrote: 
> >> >> > Hi! 
> >> >> > 
> >> >> > That was one of my first attempts :) 
> >> >> > 
> >> >> >  
> >> >> >
> >> >> >  
> >> >> >
> >> >> >  
> >> >> >
> >> >> >
> >> >> >  
> >> >> >
> >> >> >  
> >> >> >
> >> >> >  
> >> >> > 
> >> >> > The question is how could I ommit the uiElement nodes? 
> >> >> 
> >> >>  itself matches property `uiElement` so that can not be 
> >> >> removed. 
> >> >> Or, if expectation was that property name would be replaced by type 
> id 
> >> >> that is not something Jackson supports or will be able to support -- 
> >> >> it may make sense from XML viewpoint, but would not work with JSON 
> or 
> >> >> any other supported dataformat. XML is bit of an outlier as