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History

Originally, the Glassfish project developed two semi-independent projects:

• JAX-WS RI, the Reference implementation of the JAX-WS specification
• WSIT, a Java implementation of some of the WS-* and an enhanced support for interoperability with the .NET Framework. It is based on JAX-WS RI as "Web Service layer".

In June 2007, it was decided to bundle these two components as a single component named Metro.³

Features

Metro compares well with other web service frameworks in terms of functionality. Codehaus started a comparison⁴ which compared Apache Axis 1.x, Axis 2.x, Celtix, Glue, JBossWS, Xfire 1.2 and JAX-WS RI + WSIT (the bundle was not yet named Metro at that time). This was later updated by the ASF to replace Celtix with CXF and to include OracleAS 10g.⁵

Metro includes JAXB RI, JAX-WS RI, SAAJ RI, SJSXP, and WSIT, along with libraries that those components depend on, such as xmlstreambuffer, mimepull, etc.⁶

Its features include:

• Basic Profile 1.1 Compliant
• Easily Create Services from POJOs
• RPC-Encoding
• Spring Support
• REST Support
• Soap 1.1/1.2
• Streaming XML (StAX based)
• WSDL 1.1 ->Code (Client)/(Server)
• Server and Client-side Asynchrony⁷

Supported WS-* Standards⁸

Supported Transport protocols include:

• HTTP
• JMS
• SMTP/POP3
• TCP
• In-VM

Metro augments the JAX-WS environment with advanced features such as trusted, end-to-end security; optimized transport (MTOM, Fast Infoset), reliable messaging, and transactional behavior for SOAP web services.

Market share

Metro is bundled with Java SE 6 in order to allow consumers of Java SE 6 to consume Web Services.⁹

Metro is bundled with numerous application servers such as:¹⁰

• GlassFish
• Sun Java System Application Server Platform Edition 9.x
• Oracle WebLogic Server
• JBoss (version 5.x only)
• TmaxSoft JEUS 6.x

The JAXB reference implementation developed for Metro is used in virtually every Java Web Services framework (Apache Axis2, Codehaus XFire, Apache CXF) and Application Servers.

External links

• Free and open-source software portal

• Official website
• Eclipse Metro project as a part of Eclipse Enterprise for Java (EE4J)

References

1. "metro: Discover Metro". Archived from the original on 2007-07-08. https://web.archive.org/web/20070708134345/https://metro.dev.java.net/discover/ ↩

2. "metro: Metro FAQ". http://metro.java.net/discover/faq.html ↩

3. Gupta, Arun (June 19, 2007). "Announcing Metro - Naming the Web Services stack in GlassFish". Miles to go…. blogs.sun.com. Archived from the original on 2009-09-26. https://web.archive.org/web/20090926144443/http://blogs.sun.com/arungupta/entry/announcing_metro_naming_the_web ↩

4. "Stack Comparison". XFire. xfire.codehaus.org. Archived from the original on 2006-12-30. https://web.archive.org/web/20061230114334/http://xfire.codehaus.org/Stack+Comparison ↩

5. "StackComparison". Apache Web Services Wiki. Apache Wiki Farm. Archived from the original on 2017-09-04. https://web.archive.org/web/20170904141955/https://wiki.apache.org/ws/StackComparison ↩

6. "Metro". https://metro.java.net/discover/faq.html ↩

7. "StackComparison". Apache Web Services Wiki. Apache Wiki Farm. Archived from the original on 2017-09-04. https://web.archive.org/web/20170904141955/https://wiki.apache.org/ws/StackComparison ↩

8. "StackComparison". Apache Web Services Wiki. Apache Wiki Farm. Archived from the original on 2017-09-04. https://web.archive.org/web/20170904141955/https://wiki.apache.org/ws/StackComparison ↩

9. "JAX-WS FAQ". jax-ws. Archived from the original on 2007-08-07. https://web.archive.org/web/20070807124130/https://jax-ws.dev.java.net/faq/index.html#different_versions ↩

10. Gupta, Arun (July 22, 2007). "Metro - Now on Tomcat 6.x also". GlassFish. blogs.sun.com. Archived from the original on 2009-06-15. https://web.archive.org/web/20090615134727/http://blogs.sun.com/theaquarium/entry/metro_now_on_tomcat_6 ↩