SOAP Microservices with Spring Boot and Apache CXF

A docker container created with Spring Boot exposing a SOAP endpoint for a legacy client

The tech stack for this POC is:

Spring Boot 2.3.4
Java 15
Apache CXF 3.4
REST Assured 4.3
Docker

Software requirements

Workstation must be properly configured with next tools:

Java 15 JDK - https://jdk.java.net/15/
Maven - https://maven.apache.org/download.cgi

Optional tools

Docker - https://www.docker.com/products/docker-desktop
Docker hub account with token access enabled

WSDL and Domain Model

In our example, we are going to work in a fictitious Employee SOAP service with 2 operations:

GetEmployeeById
GetEmployeeByName

For the demo, I separated the XSD from the WSDL. In a real scenario, this will be the most followed pattern but expect to have more than one XSD in different folders. The employee.xsd has the full domain model for the service, next diagram shows the main response sent back to the client

The WSDL is used for describing the functionality of the SOAP-based webservice. From all the sections in the WSDL file, the most important for us is the wsdl:portType. This section defines the interface for the service we want to implement: operations, input, and output parameters:

Next is the WSDL section for wsdl:portType:

<!--This element defines the service operations and the combination of input and output elements to clients-->
<wsdl:portType name="EmployeeServicePortType">
    <wsdl:operation name="GetEmployeeById">
        <wsdl:input message="tns:EmployeeByIdRequest"/>
        <wsdl:output message="tns:EmployeeResponse"/>
    </wsdl:operation>
    <wsdl:operation name="GetEmployeesByName">
        <wsdl:input message="tns:EmployeeByNameRequest"/>
        <wsdl:output message="tns:EmployeesResponse"/>
    </wsdl:operation>
</wsdl:portType>

The complete WSDL file is here: EmployeeServices.wsdl

Installation

Make sure your computer is properly configured with the tools described in the requirements section.

In order to run the project type in root folder:

mvn spring-boot:run

You will see in the log console:

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.3.4.RELEASE)

2020-10-02 22:23:49.563  INFO 1 --- [           main] com.jpworks.datajdbc.MainApplication     : Starting MainApplication v1.0.1-SNAPSHOT on b6e50b2f461b with PID 1 (/app.jar started by root in /)
2020-10-02 22:23:49.572 DEBUG 1 --- [           main] com.jpworks.datajdbc.MainApplication     : Running with Spring Boot v2.3.4.RELEASE, Spring v5.2.9.RELEASE
2020-10-02 22:23:49.573  INFO 1 --- [           main] com.jpworks.datajdbc.MainApplication     : The following profiles are active: local
2020-10-02 22:23:51.163  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8081 (http)
2020-10-02 22:23:51.179  INFO 1 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2020-10-02 22:23:51.179  INFO 1 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.38]
2020-10-02 22:23:51.254  INFO 1 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2020-10-02 22:23:51.255  INFO 1 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1625 ms
2020-10-02 22:23:51.541  INFO 1 --- [           main] o.s.boot.web.servlet.RegistrationBean    : Servlet CXFServlet was not registered (possibly already registered?)
2020-10-02 22:23:51.885  INFO 1 --- [           main] o.a.c.w.s.f.ReflectionServiceFactoryBean : Creating Service {http://service.datajdbc.jpworks.com/}EmployeeEndpointService from class com.jpworks.employee.EmployeeService
2020-10-02 22:23:52.455  INFO 1 --- [           main] org.apache.cxf.endpoint.ServerImpl       : Setting the server's publish address to be /service/employee
2020-10-02 22:23:52.646  INFO 1 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2020-10-02 22:23:52.870  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8081 (http) with context path ''
2020-10-02 22:23:52.889  INFO 1 --- [           main] com.jpworks.datajdbc.MainApplication     : Started MainApplication in 4.018 seconds (JVM running for 4.625)

Usage

To get the available endpoints, write in the browser:

http://localhost:8081/soap

To get the wsdl of the service, write in the browser:

http://localhost:8081/soap/service/employee?wsdl

We can test the application using an Http Client like PostMan or Jmeter using a POST call (the application uses for the test cases RestAssured library). But I am going to use the traditional SoapUI, the endpoint for the service is: http://localhost:8081/soap/service/employee

2020-10-06 15:36:01.396  INFO 102696 --- [           main] com.jpworks.datajdbc.MainApplication     : Started MainApplication in 3.104 seconds (JVM running for 3.988)
2020-10-06 15:36:23.958  INFO 102696 --- [nio-8081-exec-1] o.a.c.s.EmployeeServicePortType.REQ_IN   : REQ_IN
    Address: http://localhost:8081/soap/service/employee
    HttpMethod: POST
    Content-Type: text/xml;charset=UTF-8
    ExchangeId: 872e1281-4545-45ad-9871-331d96c450cf
    ServiceName: EmployeeEndpointService
    PortName: EmployeeEndpointPort
    PortTypeName: EmployeeServicePortType
    Headers: {SOAPAction="http://www.jpworks.com/employee/GetEmployeesByName", host=localhost:8081, connection=Keep-Alive, content-type=text/xml;charset=UTF-8, Content-Length=273, accept-encoding=gzip,deflate, user-agent=Apache-HttpClient/4.5.5 (Java/12.0.1)}
    Payload: <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:emp="http://www.jpworks.com/employee">
   <soapenv:Header/>
   <soapenv:Body>
      <emp:EmployeeByNameRequest firstname="John" lastname="Miller"/>
   </soapenv:Body>
</soapenv:Envelope>

2020-10-06 15:36:23.995  INFO 102696 --- [nio-8081-exec-1] o.a.c.s.E.RESP_OUT                       : RESP_OUT
    Address: http://localhost:8081/soap/service/employee
    Content-Type: text/xml
    ResponseCode: 200
    ExchangeId: 872e1281-4545-45ad-9871-331d96c450cf
    ServiceName: EmployeeEndpointService
    PortName: EmployeeEndpointPort
    PortTypeName: EmployeeServicePortType
    Headers: {}
    Payload: <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><EmployeesResponse xmlns="http://www.jpworks.com/employee"><employee id="1" firstname="Jeffery" lastname="Lewis" birthdate="2000-01-01" gender="M"/><employee id="2" firstname="Francis" lastname="Stevens" birthdate="1999-01-01" gender="M"/></EmployeesResponse></soap:Body></soap:Envelope>

Docker Image

A Docker Hub account is required to publish the docker image into the registry. We are going to use the next values for my personal Docker account:

Account ($ACCOUNT): jpontdia
Repository ($REPOSITORY): jpontdia/ws-employee-soapcxf

Create the jar file of the service with maven:

mvn install

Log in into your Docker Hub account using your access token, more information here

docker login --username=$ACCOUNT

Example:

C:\workspace\dev\datajdbc\ws-employee-soapcxf>docker login --username=jpontdia
Password:
Login Succeeded

Create docker image

docker build --build-arg JAR_FILE=target/*.jar --tag $REPOSITORY .

Example:

C:\workspace\dev\datajdbc\ws-employee-soapcxf>docker build --build-arg JAR_FILE=target/*.jar --tag jpontdia/ws-employee-soapcxf .

Sending build context to Docker daemon  29.24MB
Step 1/5 : FROM adoptopenjdk/openjdk15:x86_64-alpine-jre-15_36
x86_64-alpine-jre-15_36: Pulling from adoptopenjdk/openjdk15
df20fa9351a1: Pull complete
485bef740c7c: Pull complete
7b26ca94da60: Pull complete
Digest: sha256:a9b20bbb07ce018260effe2113bf2f3074739afde501df615e22745df3b48571
Status: Downloaded newer image for adoptopenjdk/openjdk15:x86_64-alpine-jre-15_36
 ---> edc28ff1032d
Step 2/5 : VOLUME /tmp
 ---> Running in c6ecbb27be28
Removing intermediate container c6ecbb27be28
 ---> b6c2c51f1532
Step 3/5 : ARG JAR_FILE
 ---> Running in 193ef5bb8a6a
Removing intermediate container 193ef5bb8a6a
 ---> c4e12e3e67b2
Step 4/5 : COPY ${JAR_FILE} app.jar
 ---> 7a799bce3230
Step 5/5 : ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
 ---> Running in ff3eb68c9c64
Removing intermediate container ff3eb68c9c64
 ---> c2b63024196e
Successfully built c2b63024196e
Successfully tagged jpontdia/ws-employee-soapcxf:latest
SECURITY WARNING: You are building a Docker image from Windows against a non-Windows Docker host. All files and directories added to build context will have '-rwxr-xr-x' permissions. It is recommended to double check and reset permissions for sensitive files and directories.

Verify the image was created correctly by running:

C:\workspace\dev\datajdbc\ws-employee-soapcxf>docker images

REPOSITORY                     TAG                       IMAGE ID            CREATED             SIZE
jpontdia/ws-employee-soapcxf   latest                    c2b63024196e        19 minutes ago      221MB
adoptopenjdk/openjdk15         x86_64-alpine-jre-15_36   edc28ff1032d        9 days ago          192MB

Test image locally

docker run -p $EXPOSED_PORT:$INTERNAL_APPLICATION_PORT $REPOSITORY

Where:

$EXPOSED_PORT is the port visible for other applications on your machine
$INTERNAL_APPLICATION_PORT is the port configured in the application.yml

Example:

C:\workspace\dev\datajdbc\ws-employee-soapcxf>docker run -p 8081:8081 jpontdia/ws-employee-soapcxf

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.3.4.RELEASE)

2020-10-02 22:23:49.563  INFO 1 --- [           main] com.jpworks.datajdbc.MainApplication     : Starting MainApplication v1.0.1-SNAPSHOT on b6e50b2f461b with PID 1 (/app.jar started by root in /)
2020-10-02 22:23:49.572 DEBUG 1 --- [           main] com.jpworks.datajdbc.MainApplication     : Running with Spring Boot v2.3.4.RELEASE, Spring v5.2.9.RELEASE
2020-10-02 22:23:49.573  INFO 1 --- [           main] com.jpworks.datajdbc.MainApplication     : The following profiles are active: local
2020-10-02 22:23:51.163  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8081 (http)
2020-10-02 22:23:51.179  INFO 1 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2020-10-02 22:23:51.179  INFO 1 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.38]
2020-10-02 22:23:51.254  INFO 1 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2020-10-02 22:23:51.255  INFO 1 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1625 ms
2020-10-02 22:23:51.541  INFO 1 --- [           main] o.s.boot.web.servlet.RegistrationBean    : Servlet CXFServlet was not registered (possibly already registered?)
2020-10-02 22:23:51.885  INFO 1 --- [           main] o.a.c.w.s.f.ReflectionServiceFactoryBean : Creating Service {http://service.datajdbc.jpworks.com/}EmployeeEndpointService from class com.jpworks.employee.EmployeeService
2020-10-02 22:23:52.455  INFO 1 --- [           main] org.apache.cxf.endpoint.ServerImpl       : Setting the server's publish address to be /service/employee
2020-10-02 22:23:52.646  INFO 1 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2020-10-02 22:23:52.870  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8081 (http) with context path ''
2020-10-02 22:23:52.889  INFO 1 --- [           main] com.jpworks.datajdbc.MainApplication     : Started MainApplication in 4.018 seconds (JVM running for 4.625)

Push image to Docker Hub

docker push $REPOSITORY

Example:

docker push jpontdia/ws-employee-soapcxf

The push refers to repository [docker.io/jpontdia/ws-employee-soapcxf]
a5988eef4f17: Pushed
8ec501d69d1a: Mounted from adoptopenjdk/openjdk15
41eb7e916580: Mounted from adoptopenjdk/openjdk15
50644c29ef5a: Mounted from jpontdia/ws-employee
latest: digest: sha256:f414594938049532b74fff2bd3c63269c9322de5c83007d8b42a5f46f1b93ec6 size: 1163

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

Name		Name	Last commit message	Last commit date
Latest commit History 35 Commits
.github/workflows		.github/workflows
assets		assets
src		src
.gitignore		.gitignore
Dockerfile		Dockerfile
LICENSE		LICENSE
README.md		README.md
docker-readme.md		docker-readme.md
pom.xml		pom.xml

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