Jersey framework uses both Jackson and Jettison libraries for JSON unmarshalling/marshalling.
AFAIK, Jettison is for for mapping JSON to XML (with different mechanism support like mapped notation) and Jackson is for JSON generation/parsing (I'm using this without Jersey also).
Will Jersey using these two for two different functionalities or both for same JSON generation/parsing functionality?
I only want support JSON format. At my first thought, it seems I can remove either of the dependencies and I think I can remove Jettison as Jacksone seems more natural choice for JSON generation/parsing.
Jersey will use one or the other, not both, for all JSON processing.
Recommendation as far as I know is to use Jackson; Jettison support is older and was implemented before Jackson became available. Jettison is still supported for compatibility reasons but unless some code relies on exact structure it produces (which differs from straight-forward mapping) there's little benefit from using it.
I agree, use Jackson or even GSON from google. Jettison has too much limitations and the performance is also lower.
Related
Is it possible using Wildfly's JAXB implementation?
There is an answer Converting Java Object to Json using Marshaller, but it seems to be implementation specific.
if you were constrained to use the jaxb (for example, when you need the flexibility to have both xml and json class in the same spot) you might want to refer to these
Wildfly Reference
A Simple tutorial, from MKYong
but if the jaxb is not a constraint to have, i reccomend using either GSON or jackson. they are both relatively easy to use when reading json to a POJO and vice-versa
JSR-353 does not include object binding. If you want to marshal/unmarshal JSON you'd have to using something like Jackson.
It does you know real good now, but there is JSR-367 to include bindings in Java EE 8.
I have been reading the very interesting section of the Jersey documentation regarding entity filtering, particularly the section regarding role-based filtering.
Unfortunately it looks like the feature is only available when using MOXy and support for Jackson is in the backlog for now.
So I was thinking about giving it a shot and writing the required classes to implement Jackson-based security annotation role-based filtering. This doesn't seem like an easy task. I am guessing I would have to register my own ObjectMapperProvider for Jackson that returns a wrapper for the Jackson ObjectMapper and via "some magic" do the filtering in the wrapper.
Is this a good way to go? Or is there a simpler way?
Upgrade to Jersey 2.16 that has entity filtering support for JSON via Jackson.
reference: http://blog.dejavu.sk/2015/02/04/jerseys-entity-filtering-meets-jackson/
and here is an example of role-based entity filtering: https://github.com/jersey/jersey/tree/master/examples/entity-filtering-security
Hi I am having a java bean and i need to serialize it to json. For this purpose i am using the jackson processor which is very powerful. But I also need to convert the java bean to XML.
Can this be achieved using the jackson processor ?? If yes then please provide with the links where I can get the examples.
Thanks!!!!
If you want to keep Jackson and JSON out of your pojos, you can create a translation layer that can translate to a JAXB object and use pure JAXB (JAXB being one possible implementation in this case). If your domain objects map straight to the rendered JSON or you can use mixins/PropertyNamingStrategy, you will need no annotations in your pojos. I'm not sure if this is applicable in your situation but I know that many environments strive for this.
Definitely! Jackson obviously has first-class support for JSON; but there is also simple extension module to do "mini-JAXB": jackson-xml-databind.
With Jackson's support for JAXB annotations (or not, if you just prefer Jackson's own annotations & xml module's couple additional ones), it's definitely possible to do both JSON and XML just using Jackson functionality.
I mostly recommend this for cases where XML support is a legacy thing (which is what most new services do). If XML is the main focus, it may make more sense to use JAXB.
But even then I recommend against using conversion layers from XML to JSON; ones I have seen used have been plagues with issues when they conversion at data format layer, which IMO is completely wrong place to do it. This is also why Jackson does not try converting JSON to XML (or vice versa); rather, it only supports converting POJOs to/from external data formats.
Yes it is possible. You would need to annotate your Java bean using the JAXB annotations which will give you the XML marshalling and unmarshalling support. Then, using Jackson's support for JAXB annotations you can go back and forth between Java and JSON.
hi
I started learning google data api.
I have one question
What will be the best way of parsing xml google data xml ?
1 > Should I go with manually parsing xml ?
Or
2 > XML to java object mapping technique ?
I am thinking about going with 2 way, As it will require writing less code from my side.
But I don't know how slow it will be in comparison to 1 way.
How slow is xml to java mapping technique ?
Is there any other better way to parse gdata xml ?
How slow is xml to java mapping
technique ?
The answer to this question depends on what you are comparing the xml to Java mapping technique to. Many object-to-XML solutions have been around for quite a while and have learned a number of tricks to do this conversion.
Is there any other better way to parse
gdata xml ?
Note: I'm the EclipseLink JAXB (MOXy) lead, and a member of the JAXB (JSR-222) expert group.
I'm not that familiar with the Google Data API, but after a quick google, it appears to be related to Atom which can easily be handled by any of the JAXB implementations:
Metro (reference implementation included in Java SE 6)
EclipseLink JAXB (MOXy)
Apache JaxMe
For an Atom example see:
http://bdoughan.blogspot.com/2010/09/processing-atom-feeds-with-jaxb.html
With JAXB you can also start with your own object model and add annotations to apply the XML mapping:
http://bdoughan.blogspot.com/2010/11/jaxb-and-inheritance-using-substitution.html
http://bdoughan.blogspot.com/2010/10/jaxb-and-xsd-choice-xmlelements.html
http://bdoughan.blogspot.com/2010/09/jaxb-collection-properties.html
MOXy also contains an XPath mapping extension that makes mapping your object model even easier:
http://bdoughan.blogspot.com/2010/09/xpath-based-mapping-geocode-example.html
Take a look at Caster project. Judging from your question, i don't think you would want to go though the trouble to parse the XML using the correct schema and create POJO's to match them (which is troublesome anyway).
I used Caster sometime ago, it is not the best, but got my problem solved pretty fast.
http://www.castor.org/
I need an open-source tool which can convert POJOs to XML and JSON strings.
Jersey (and probably other JAX-RS implementations) would fit these requirements if mappings could be configured through xml-files but not through annotations.
Is there anything suitable?
POJO to XML
JAXB is the Java standard (JSR-222) for converting Java objects to/from XML (I am a member of the JAXB expert group):
http://bdoughan.blogspot.com/2010/07/jaxb-xml-binding-standard.html
POJO to JSON
People have been using JAXB with Jettison to produce JSON. This is how Jersey (JAX-RS reference implementation) converts POJOs to JSON by default.
http://bdoughan.blogspot.com/2011/04/jaxb-and-json-via-jettison.html
XML Configuration
If you require the ability to configure the metadata via XML, then you can use EclipseLink JAXB (MOXy), I'm the MOXy tech lead:
http://bdoughan.blogspot.com/2010/12/extending-jaxb-representing-annotations.html
There are lots of suitable JSON libraries; aside from GSON that was mentioned, Jackson is an obvious choice. Typically you don't need any annotations; but even if you neded, Jackson can use so-called mix-in annotations which means associating configuration, not modifying actual POJOs. Finally, Jackson supports JAXB annotations if you must use them (for example, when using JAXB for producing XML).
And as an added bonus, there is Jackson extension module, jackson-xml-databind, which can data bind POJOs to and from XML, so you can just use one library for both.
Have you tried Castor?
http://www.castor.org/
Supports XML mapping -
http://www.castor.org/xml-mapping.html
From XML, you could use json-lib if you need JSON.
http://answers.oreilly.com/topic/278-how-to-convert-xml-to-json-in-java/
Check out GSON for converting POJOs to JSON:
http://code.google.com/p/google-gson/
We've been using for a couple of years now. Very excellent library.
For POJOs to XML, Jersey uses JAXB or you could roll your own serializer.