Java Web Services

Download the completed projects zip from lecture resources after exiting full screen, unzip them, and use these reference projects upgraded to Spring Boot 3.2.2 and Java 21 for guidance.

Clone the GitHub repository at github dot com slash Bharath Thippireddy to access all completed Java web services projects for reference, run them, and explore.

Resolve maven issues by deleting the .m2 repository, then run mvn clean, mvn install, and update the project to pull latest dependencies from the central Maven repository.

Discover how to add the JAXB API Maven dependency for Java 10 and higher by updating your pom.xml and performing a Maven project update to avoid missing JAXB classes.

Learn to troubleshoot and upgrade library versions in maven projects, using the latest Spring Boot and Apache CXF, updating pom.xml, ensuring the codegen plugin is current, and resolving incompatibilities.

Get a concise overview of the Java web services course, with sections and lectures, quizzes for self-checks, and a self-paced path to becoming a web services master.

Explore web services basics, including SOAP and RESTful types, and how Java uses JAX-WS and JAX-RS to enable interoperable, loosely coupled client–server apps across XML and JSON formats.

Explore service oriented architecture and web services as a contract-based, loosely coupled collection of platform-independent components with xml messaging.

Explore how XML serves as configuration and data exchange in web services, using Apache CXF with SOAP and REST, and define contracts with XML schema and namespaces.

Discover what XML is and how the Extensible Markup Language lets you create your own markup without predefined elements, enabling e-commerce orders, news headlines, and data exchange between applications.

Explore why xml offers custom markup and carries both data and metadata, enabling seamless data exchange with well-formed rules and schema validation in distributed applications.

Use XML for data exchange between applications, for configuration files, and for saving, manipulating, and presenting data, leveraging its data and meta data and validation capabilities.

Learn what an XML schema definition is and how it defines the grammar for an XML document, including elements, attributes, namespaces, order, value restrictions, ensuring validity via a .xsd file.

Understand how XML schema files act as a contract between XML users, ensuring valid data and well-defined elements and attributes when apps exchange messages or configurations.

Learn how namespaces uniquely identify XML elements and attributes by defining target namespaces, using prefixes and xmlns, to qualify elements in schemas for Amazon and eBay orders.

Define and build an xml schema to exchange patient data between hospital apps, using built-in, simple, and complex types to validate key fields.

Build a patient xml schema in eclipse by defining a complex type with a sequence, setting a target namespace with tns, and validating xml files against the schema.

Define simple types in an XML schema by restricting id to numeric with pattern, limiting name to 15 chars, and using an enum for gender within the patient complex type.

model payment options in a patient schema by defining a payment type with cash or insurance using choice, and insurance with all to require provider and limit, validating the xml.

Control how many times xml elements occur using minoccurs and maxoccurs in the xml schema, including optional elements and the unbonded value for unlimited emails.

Learn how the elementFormDefault attribute decides whether xml elements are qualified with a namespace when validating against a schema, and follow the best practice to keep them qualified.

Learn to define attributes in xml schema by converting an id from an element to an attribute within a complex type.

Examine XML and XSD contracts, validation, namespaces, and built-in simple and complex types; control element order with sequence, all, and choice, and occurrence with min-occurs and max-occurs, plus attributes.

Explore JSON as a lightweight data format for exchanging data between the back end and front end, covering strings, numbers, objects, arrays, booleans, and null, with serialization and parsing.

Serialize a JavaScript object to a JSON string with JSON.stringify and deserialize it back with JSON.parse, then apply it in Ajax calls and restful web services.

Learn what, why, and when to use soap web services in Java, and evaluate advantages and disadvantages today. Master the building blocks, soap, wsdl, http, and the wsdl file sections.

Explore how web services enable cross-platform communication using http, xml, and soap messages, enabling loosely coupled interactions between hospital patient services, clinical services, and billing and insurance services.

Explore the advantages and limitations of SOAP web services, highlighting platform independence, cross-environment interoperability between Java and .NET, and performance costs from serialization and deserialization.

Learn how SOAP, a W3C XML-based specification, uses the envelope, header, and body to send requests and receive responses, with SOAP fault handling and security headers.

Master wsdl basics by exploring its abstract and physical sections, including types, messages, operations, porttype, binding, and service, to see how a web services wsdl defines requests and responses.

Examine WSDL binding styles such as RPC encoded, RPC literal, document encoded, document literal, and document literal wrap; analyze payload shapes, schema validation, and WSI compliance to guide usage.

Soap web services use http and xml, with applications both providers and consumers. Learn when to use a wsdl contract and how bindings enable secure, asynchronous communication.

Explore two different approaches to maintaining subsystems in Java, learn the standard stack for Java web services, and discover the features that make it popular.

Explore contract-first (wsdl-first) and code-first (java-first) soap web services, their generation and implementation steps, and when to use each approach for interoperability and legacy integration.

contrast wsdl-first (contract-first) and code-first approaches for soap web services; wsdl-first provides clarity and interoperability, while code-first suits legacy apps to be exposed when needed.

Learn how JAX-WS provides a Java API and specification for XML-based web services, using core annotations like webservice, webmethod, webparam, and webfault to build SOAP-based endpoints.

JAXB maps Java classes to XML, generates Java classes from XML schemas with XJC, and performs marshalling and unmarshalling via a runtime API and annotations.

Learn to use JAXB tools and Maven plugins to generate XML schemas from Java classes and generate Java stubs from schemas using schemagen and xjc.

Create a Spring Tool Suite Maven project, import XML schema files, configure the JAXB Maven plugin, and generate Java stubs to serialize and deserialize objects to and from XML.

Generate stubs by configuring the JAXB Maven plugin in pom.xml, pointing to the schema directory and outputting to the generated sources folder, then run Maven generate-sources to rebuild stubs.

Walk through how patient.xsd maps to patient.java with JAXB annotations, covering root, accessor type, type, field vs method level, element and attribute mappings, and the object factory.

Master marshalling and unmarshalling with the JAXB runtime API using a JAXB context, marshaller, and unmarshaller to convert Java objects to and from XML in web services.

Explore jax-ws, the Java API for XML based web services and an Oracle standard for SOAP based web services, focusing on the annotation driven API and SOAP binding.

Explore JAXB, the Oracle Java API for XML binding, and how it serializes Java objects to XML and back, using xjc, schemagen, and Maven plugins.

Learn how web services engines serialize and deserialize requests, dispatch them to the right classes, and why Apache CXF is popular, with its project structure and a Maven setup.

Apache CXF provides a Java web services stack with JAX-WS and JAX-RS, soap and rest engines, serialization and dispatch to endpoints, wssecurity and ws policy support, wsdl2java, and Spring configuration.

Explore how Apache CXF with Spring Boot simplifies creating web services by adding a single cxf-spring-starter-jaxrs dependency; endpoints publish automatically via application properties.

Spring Boot provides an easy way to create and run Java applications; the Java Web Services course covers everything in detail, with a free Section 25 preview in Easy Steps.

Upgrade Spring Boot to 2.x and update Apache CXF to 3.2.4 to support Spring Boot 2.0, then clean and rebuild the project to fetch latest dependencies via Maven.

Create a hello soap web service project in spring boot, add the CXF JAX-WS dependency, implement the endpoint and configuration, and run to generate the wsdl.

Upgrade your soap web service setup by using spring boot 2.4.0 as of January 2021 and the latest Apache CXF spring boot dependencies 3.4.2 to avoid incompatibilities.

Create a soap web service endpoint by annotating a pojo with @WebService and @WebMethod. Examine maven dependencies, including the CXF spring boot starter, which support web services.

Create a spring configuration class annotated with @Configuration, define a bean endpoint for HelloWS published at /hello using a JAX-WS endpoint with the CXF bus.

Run the application as a Spring Boot app to launch an embedded Tomcat and deploy the project. Access CXF services at localhost:8080/services and view the hello service and WSDL.

Configure a web application context in spring boot and set CXF path to expose endpoints under a custom context, such as hello ws, with an accessible wsdl.

Test a soap web service with SoapUI by loading the wsdl, creating a soap project, and sending a sample request to the hello endpoint.

Enable logging in CXF by annotating the hello ws web service with the logging feature, logging incoming soap requests and outgoing soap responses to the console.

Design and implement a wsdl-first customer order service to create orders. Generate stubs from the wsdl, implement the endpoint, read orders, and configure CXF in spring and services.xml.

Implement a wsdl-first web service in six steps: create the project, endpoint, spring configuration, and run the app, then create wsdl and generate stubs.

Create the wsdl first ws project, add the CXF jaxrs dependency to pom.xml, and set the application context to wsdl first ws with a root services path.

Define xml schema types in the wsdl types section by creating two complex types, product and order, with product fields id, description, quantity, and order containing id and products.

Define the final two complex types for create order request and response, with customerId as xsd:integer, an order element, and a createOrdersResponse with a boolean result, preparing for schema elements.

Define four xsd elements in the schema for getOrdersRequest, getOrdersResponse, createOrdersRequest, and createOrdersResponse. Prepare the wsdl type section and outline the upcoming messages, operations, portType, binding, and services.

Define messages in a wsdl for a java web service by creating getOrdersRequest, getOrdersResponse, createOrdersRequest, and createOrdersResponse, then prepare to define operations in the next lecture.

Define operations inside the wsdl portType by adding getOrdersRequest and getOrdersResponse, then createOrders with createOrdersRequest and its response, copying operation elements as needed.

Define the binding section by mapping the CustomerOrdersPortType to a binding, and specify document-literal soap bindings for getOrders and createOrders with their input and output messages.

Define the WSDL service by linking the binding to a port, apply a clear naming convention with CustomerOrdersServiceSoapBinding, and specify the service endpoint http://localhost:8080/wsdlfirstws/services/customerOrdersService.

Fix wsdl errors by naming the portType input and output messages, using getOrdersRequest and createOrdersRequest plus createOrdersResponse, then copy, paste, and save to produce an error-free wsdl.

Learn to design a wsdl from xml schema types to expose get and create orders, define order and product types, port type, document-literal binding, and runtime url replacement with CXF.

Implement the customer orders web service endpoint by coding the wsdl-generated port type interface and overriding get orders and create orders methods.

Implement the init method to build an in-memory hash map of customers and orders for a Java web services endpoint, initializing one customer with one order.

Implement the get orders method by extracting the customer id from the request, fetching the customer orders from the orders map, and returning them in a get orders response.

Implement the createOrders method by retrieving the customer id and order from the request, add the new order to the customer's orders in the map, and return a boolean success.

Create and update a Java Spring configuration file to publish the web service endpoint, moving configurations to the proper package and exposing the customer orders service at the designated URL.

Enable the Apache CXF logging feature to log incoming and outgoing soap messages to the Tomcat console, by configuring the feature annotation on the web service implementation.

Run the wsdl first web service, launch the spring boot app on tomcat, view services at localhost:8080, access the wsdl link, and prepare to generate stubs with soap ui.

Test a wsdl-first web service with SoapUI by importing the WSDL, auto-generating a test suite and test cases, and validating get orders and create orders operations.

Design and implement a wsdl-first Java web service for customer orders, adding delete order support by defining delete order request/response, messages, port type, and binding, and generating stubs.

Build a Java SOAP client with Apache CXF by generating stubs from a WSDL and creating a Spring Boot based client to access the customer order service.

Create a java client project to consume a web service with java code, using a Spring Boot starter, adding the CXF dependency, and generating stubs from the wsdl in resources.

Download the customer orders wsdl file from service URL and save it as customer orders.wsdl in the STS java soap client project under a WSDL folder in source main resources.

Generate stubs from the wsdl by adding the code gen plugin to the client pom.xml, then run maven to produce stubs under target/generated/cxf for a web service client.

Develop a Java soap web services client by generating stubs, creating the service with the wsdl URL, obtaining the port type, and invoking get orders to display customer orders.

Practice invoking the create method with an order and customer id by forming create requests, using the get order request, and displaying the response in a Java web services assignment.

Demystify how the service provider mechanism creates a delegate at runtime to build a dynamic soap web service client using the CXF JAX-WS provider to serialize and call the endpoint.

Develop a Java soap client for the order processing web service by configuring pom.xml, generating wsdl-derived stubs with Apache CXF, and using the Java 6 service provider mechanism.