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How to invoke existing SOAP webservice into REST API Spring boot application

I have a Rest Spring boot application, I need to invoke external SOAP webservice in my Rest Spring boot application - similar question asked in stackoverflow - Calling a SOAP service using REST service but didn't get any exact steps. One blog I found the solution but don't know whether it right approach or not - https://docs.oracle.com/cd/E19340-01/820-6767/aeqgc/index.html
Let me know if anyone knows the solution. Whether need to create wsdl in Spring boot rest application or directly convert the json to xml and invoke the endpoint ?

The WSDL is provided by the SOAP Web service. You can get it by visiting its WSDL endpoint url.
The idea is that once you get the WSDL , copy it to your project folder and then use some maven plugin to generate a SOAP client from the WSDL. Here is the spring official guide for how to do it.
You operate the generated client in the java object level and it will help to format the SOAP request in the correct XML format and then send out .So you do not need to manually create the XML request by yourself.

Build SOAP XML Web Service that stores data to DB and response result to client

I have been assigned to build SOAP XML web service which does the following:
Listens for a SOAP request from client application that will send the values for 2 parameter(login name, product_id)
Stores the SOAP request/outbound response transaction to a SQL database table
Doing checking if login already exist or not in database. if yes, send response to client. If not, the values store in database and also response back to client
I am planning to do this JAVA.
Can anybody point me in the right direction for how this should be done? Thank you in advance for any feedback.

To build a SOAP XML web service you need web service provider and web service client. To do so there are two approaches:
Top Down
Top down is the proper way of defining rules for the web service for both client and provider. Top down means you have to create a WSDL file first in order to generate stubs out of it to create provider as well as client.
Bottom UP
Bottom is used for legacy application, to expose already existing application as a web service
Wsdl to java is a plugin used to generate stubs(classes) out of wsdl file. After creating wsdl and stubs out of it...you need to mark the pojo's with JAX-B Annotations and service methods(Your web service business logic methods) with JAX-WS Annotations. For this you could use Apache CXF JAX-WS Maven Dependency or others. After that you need to publish an Endpoint for the web service you created using bus and Endpoint class from JAX-WS.
After Exposing out the service, you can use the same wsdl to generate Client or Without creating a client you could test your web service using SOAP UI tool.
Follow this Link for more!

Microserivce Using Spring Boot to Consume SOAP

I need to create a REST service that first consumes SOAP. What would the best way to go about this?
I would like to use Spring Boot to create a microservice, but I have a few questions for those with experience:
What other architectures or technologies should I look into using
(with spring boot)?
Is there a standard technology stack for this?
Are there pitfalls I should be aware of?

What other architectures or technologies should I look into using (with spring boot)?
My answer is if you just want to simply provide RESTful service
without Spring Cloud, then I think you can refer to following 2
tutorials on Spring official website to achieve this:
Building a RESTful Web Service
Consuming a SOAP web service
Is there a standard technology stack for this?
Currently, I will suggest you to use Spring Boot as your first choice. Because these are rich resources on the web and it does reduces much effort in development.
Are there pitfalls I should be aware of?
If you finally choose Spring Boot, please be familiar to its components, you can start from Guides to realize how it works. Or you may mix up Spring Boot with tradition Spring framework.

There are similar cases in our project and we did it with spring components. As far as i understood, you want to open a REST endpoint which most probably accepts json object and you want to make a soap web service request within that request then you want to return a response containing information from the soap response. To make a soap request, you can use spring web services - WebServiceTemplate. It will marshall your object to xml and make soap request for you. Of course you can use some other web service frameworks like apache cxf which may best fit for some special cases, but i would first try to use a framework which is from spring family while using Spring. You should set timeout values on webservicetemplate object to not wait too long if the external system is not working well or you have some problems with the network. Because it directly affects your systems performance. Also here, i suggest you to implement circuit breaker pattern to make your system more robust. You should always isolate your systems performance from other systems that you integrate and in this scenario you can do this by doing the things explained above.

As per my knowledge , you should use Spring boot application with Maven build.
In order to send a REST call to SOAP web service and get back a JSON Response ,you need to follow all of this steps in order :
Business Logic : Mapping the JSON fields such as headers, query-param , body variables to XML Request mandatory fields (either using pojo classes or object-mapper) Reason : Since the SOAP end point will only accept XML Request.
Service Broker Logic : Import "org.springframework.web.client.RestTemplate" and use
**ResponseEntity<String> responseEntity=RestTemplate.exchange(endPointURL, HttpMethod.GET/POST/PUT/DELETE, HttpEntity/headers, uriVariables)**
**endpointURL** -- SOAP End point URL ,that the REST service has to consume.
**HTTPMethod** -- Method Type such as GET ,PUT ,POST ,DELETE etc.
**HTTPEntity** -- Soap requires for mandatory sender/headers/{a}.Make sure that you set your header name and value as key-Valye pair in HTTP headers.
**uriVariables** -- (Object... urivariables) such as String.class ,Integer.class
You should also put the **connectTimeout** ,**isSSLDisabled**,**responseCached** elements while generating request to restTemplate.
responseEntity.getBody() is the XML response after un-marshalling.It can be extracted by using mapper.
XML_BaseResponse response=mapper.readValue(responseEntity.getBody(), XML_BaseResponse.class);
Business Logic : Extract necessary field from XML_BaseResponse and using setter's or getter's functions,set the mandatory fields in the response.
baseResponse.setName(xml_baseResponse.getPersonsName());
baseResponse.setAddress(xml_baseResponse.getAddress());
baseResponse.setCity(xml_baseResponse.getcityName());

What is purpose of CXF or Spring WS

I am new to consuming web services. I am trying to consume a SOAP service. This is currently in the test environment. What I have done is
Use wsdl2java to generate a wsdl that I have copied to my domain folder.
Use the API to send requests and receive responses.
What concerns me is do I need CXF or Spring WS to wire the service or is what I have sufficient. I am asking this because I have seen elsewhere like
What I don't get is where I would generate property when environments are switching from development to QA to production. And do I need to use CXF or Spring WS or are the annotated classes (#WebServiceClient sufficient) to consume the SOAP service. Basically, how to connect to different endpoints.
I apologize if this is rudimentary question. Thanks.

Spring-WS and Apache CXF are primarily useful for creating web-services. They are alternative web service implementations to the one that ships with Java6.
You can use them for writing clients, but there's not really much point, unless you're really keen on the alternative API that those provide.
The standard JAX-WS artifacts generated by wsdl2java should be perfectly sufficient for what you need.
As for your second question regarding how to target different prod/QA endpoints, you should ask a separate question for that, with full examples of what you have.

Remote Web Services

I am new to web services. I have a requirement in my project. I have to consume the web services of our vendor in my project. All he has shared with me is a WSDL file and a document about the description of the the different operations.
Question:-
1: What do I need to do consume these web services in my java project? I have been advised to use axis2, eclipse with tomcat6.
2: Do I need to ask for some other files/information from WS vendor OR wsdl file is enough to consume these web services?
3: Do I need to write a java WS client (using axis2 plugin) or another webservice which will talk to vendor web service?
Please suggest the best possible way.
I am sorry if the question sounds like a naive..

Axis is a solid choice for such application.
You need to generate an axis client based on the provided WSDL. Then you import the generated client and use it's methods. You can see the details of this process here (read whole page or starting from the linked section): http://ws.apache.org/axis2/1_0/userguide3.html#Writing_Web_Service_Clients_using_Code_Generation_with_Data_Binding_Support
You could also need some entry-point (WebService URL).
You need to generate a client, not a webservice. See point 1.

Don't use Axis if you need ambient authentication in a Windows environment. I went down that path and ended up going with Apache CXF - which seems better to me anyhow.

You can use SOAP UI to test the web service. It'll read the WSDL, let you create requests by filling in values, and display the response that you get back. It might help you get a better understanding of what the service does before you start writing your classes.

You don't need to create a new web service in order to consume a web service, you need to write a web service client.
Similar question to this one:
Steps in creating a web service using Axis2 - The client code
All the standard web frameworks have a command (normally called wsdl2java) that will read the WSDL and then generate a java based client object.
I can recommend Axis2, but another popular choice is CXF