I'm calling a 3rd party restful webservice that returns a complex JSON object. Is there a way for Spring or any open source tool to auto generate the client side code object.
In Soap, I'm use to doing wsdl2java in cxf but I don't know what the equivalent is in the restful space.
In the end I would like to use the rest template to make the following call:
restTemplate.getForObject("url", generateObject.class)
Answer is yes as long as you have json schema for your input file.
I dont remember at the moment how this framework is called but it is google product.
It auto generates Java class annotated with Json. It is really good. I will look for name.
For the same thing I used a framework called XStream (http://x-stream.github.io/). It's pretty light and will definately help you :)
Related
I’m building a REST API using Spring Boot and [jackson-module-jsonSchema] (https://github.com/FasterXML/jackson-module-jsonSchema) for JSON schema generation.
I’m looking the best way to validate the request JSON payload arriving to my APIs endpoints (Spring controllers) against the defined JSON schema defined for the exposed resource, validation includes check required fields , format , min and max values, etc.. everything we can validate against the schema.
Seems jackson json schema module is useful for schema generation but not for validation, am I right?
Any suggestion on how to achieve what I’m trying to do?
If you take a look at JSON schema site, there are only two libraries for validation in Java.
The one that Jorge Campos suggested is mature, but looking for new maintainer: https://github.com/fge/json-schema-validator
Second one is relatively new: http://github.com/everit-org/json-schema
I was recently in situation where I had to choose one or the other and I picked first option. It is being used also by Rest Assured library under the hood.
You can also look at Rest Assured Json Schema validator
https://www.baeldung.com/rest-assured-json-schema
I'm searching for a way to consume soap webservices without using wsimport and tools like that. So far, everyting I found requires the wsdl artifacts generation and I want to avoid it because I don't know wich webservices will be used.
The idea is to give the user the possibility to add several WSDL's urls / methods and the program consume them and send it's response to another url.
I'm not looking for out of the box solutions/code or something like that.
What I need is to know if it is possible or not and how to aproach this problem, ideas and things like that.
Thanks!
SOAP mandates a contract between the Client and Server. The contract is that Client will give a request XML is XYZ format and Server will give response in ABC format. Without this, SOAP does not work. This is what is defined in WSDL. So we have to use WSDL.
Tools like wsimport, wsdl4j convert these WSDL files into an object hierarchy and prepares a JAXB wrapper for you, to make life easy!
Now if you do not want to use the tools which automatically convert WSDL to Java Beans or anything of that sort, note SOAP is based on nothing but an XML. If you know how to parse an XML in java, thats pretty much it. You can use a JAX Parser to achieve this and you can read everything that comes in a SOAP request and response.
The problem that you will face is, as the complexity of the SOAP XML grows, it will be difficult for you to parse the XML properly, identify the nodes, values and relations properly. And add to that the problem where in you cannot, without a proper object hierarchy , relate between nodes which are distance apart. Meaning, from line 100 you cannot go back and relate a line 10 node, unless you start maintaining your own objects, relations etc. (which is not what you want, i guess)
Using Java Beans the object hierarchy is maintained and because of that it is easy for you to relate them between different objects at different nodes easily. But JAXB is comparatively slower than JAX.
I am trying to create a RESTful webservice in java, but , as I am new to this, I am not sure
if there is a tool like wsimport (for SOAP based webservices) which can be used to create the Data objects or Entities (resources in REST world).
I searched the net for examples..But all of them seem to be the hello world types with no clear data modeling details.
How do I create the Data objects for a RESTful Webservice from scratch using just a XSD file ?
Any pointers will be helpful!
RESTful webservices do not have a contract like SOAP so automatic code generation for the services is difficult unless the RESTful webservices are using WADL (not very commonly used). If you are using WADL, you can use CXF to generate java code.
However if you have XSD files you can generate java code classes for them using JAXB (xjc is the command). This will work well for the Data model objects, service classes will probably need to be hand coded.
See the accepted answer in this question: How to generate JAXB classes from XSD?
A couple more links that might help:
JAXB XJC tutorial
If you use Intellij, see this
I'm a newie using Retrofit, and I was seraching for a automatic way to generate the class types for consume a rest web service with retrifit becouse as far as I've seen I'm suposed map all the objects that returns the server.
Specifically I want to work with a Endpoint Django REST framework 2.3.14 with a lot of elements by each method, Thats why I want to generate in an automatic way the element types.
I've seen some with JAX-RS but I'm not sure it works with django Rest Services.
Any help would be very appreciated.
Thanks
Use this [website]http://www.jsonschema2pojo.org, very useful to convert JSON to POJOs...
I want to access an external RESTFul Web service via Java, and use an open source package that processes the returned XML or Json result and creates object(s) from this data.
I know that there are many solutions out there for this, and I'd like to get your feedback on which one I should use.
For accessing the web services, I know that I can use packages such as apache HttpClient etc. but I'm sure that there are packages that wrap this and also take care of processing the returned data (i.e. creating java objects from the result).
Thanks,
Nina
Spring is great, but this is one case where there are higher-level libraries out there that make it even easier. See for example the clients that come along with JAX-RS implementations like the Jersey client and the CXF client. Some implementations can even provide clients through dynamic proxying if you have a service interface and resource classes available. This way, you hardly have to write any code at all.
Spring Rest Template is your friend.
Spring MVC has something called "RestTemplate" which can be used exactly for this.
http://aruld.info/resttemplate-the-spring-way-of-accessing-restful-services/
http://blog.springsource.com/2009/03/27/rest-in-spring-3-resttemplate/