Apache CXF is an open source services framework. CXF helps you build and develop services using frontend programming APIs, like JAX-WS and JAX-RS. These services can speak a variety of protocols such as SOAP, XML/HTTP, RESTful HTTP, or CORBA and work over a variety of transports such as HTTP, JMS or JBI.
Apache CXF is an open-source, fully featured Web services framework. It originated as the combination of two open-source projects: Celtix developed by IONA Technologies (acquired by Progress Software in 2008) and XFire developed by a team hosted at Codehaus. These two projects were combined by people working together at the Apache Software Foundation and the new name CXF was derived by combining "Celtix" and "XFire".
Why We Use Apache CXF?
We use CXF when building:
• Enterprise web services (SOAP or REST)
• Service-oriented architectures (SOA)
• API gateways or service layers in Java systems
• Systems needing strong standards compliance (WS-* specs)
Key Features of CXF
1. Dual Support: SOAP + REST
• SOAP (heavy, contract-based, XML)
• REST (lightweight, resource-based)
2. Standards Compliance
Supports many WS-* standards:
• WS-Security
• WS-ReliableMessaging
• WS-Addressing
3. Flexible Architecture
Can run on:
• Servlet containers (Tomcat, Jetty)
• Application servers (WildFly, WebLogic)
Can embed into Spring-based applications
4. Code Generation
• Generates Java classes from WSDL
• Generates WSDL from Java code
5. Interceptors
Allows you to plug into request/response flow for:
• Logging
• Security
• Transformation
Design considerations of CXF
The CXF key design considerations include:
• Clean separation of front-ends, like JAX-WS, from the core code.
• Simplicity with, for instance, the creation of clients and endpoints without annotations.
• High performance with minimum computational overhead.
• Embeddable Web service component: example embeddings include Spring Framework and Geronimo.
CXF is often used with Apache ServiceMix, Apache Camel and Apache ActiveMQ in service-oriented architecture (SOA) infrastructure projects.
Advantages
• Supports both SOAP and REST
• Strong enterprise-grade features
• Highly extensible (interceptors, plugins)
• Good integration with Spring ecosystem
• Standards-compliant (important for enterprise systems)
Disadvantages
• Complex configuration compared to modern frameworks
• Heavier than lightweight REST frameworks (like Spring Boot REST)
• SOAP support adds overhead if not needed
• Steeper learning curve
