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Metro is a high-performance, extensible, easy-to-use web service stack. Although historically an
open-source Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use the source code, design documents, or content of the product. The open-source model is a decentralized s ...
part of the
GlassFish GlassFish is an open-source Jakarta EE platform application server project started by Sun Microsystems, then sponsored by Oracle Corporation, and now living at the Eclipse Foundation and supported by Payara, Oracle and Red Hat. The supported ...
application server An application server is a server that hosts applications or software that delivers a business application through a communication protocol. An application server framework is a service layer model. It includes software components available to a ...
, it can also be used in a stand-alone configuration. Components of Metro include: JAXB RI,
JAX-WS The Jakarta XML Web Services (JAX-WS; formerly Java API for XML Web Services) is a Jakarta EE API for creating web services, particularly SOAP services. JAX-WS is one of the Java XML programming APIs. Overview The JAX-WS 2.2 specificatioJSR ...
RI, SAAJ RI,
StAX Streaming API for XML (StAX) is an application programming interface (API) to read and write XML documents, originating from the Java programming language community. Traditionally, XML APIs are either: * DOM based - the entire document is read i ...
(SJSXP implementation) and WSIT. Originally available under the
CDDL The Common Development and Distribution License (CDDL) is a free and open-source software license, produced by Sun Microsystems, based on the Mozilla Public License (MPL). Files licensed under the CDDL can be combined with files licensed under oth ...
and
GPLv2 The GNU General Public License (GNU GPL or simply GPL) is a series of widely used free software licenses that guarantee end users the four freedoms to run, study, share, and modify the software. The license was the first copyleft for general ...
with
classpath exception A GPL linking exception modifies the GNU General Public License (GPL) in a way that enables software projects which provide library code to be " linked to" the programs that use them, without applying the full terms of the GPL to the using program. ...
, it is now available under


History

Originally, the Glassfish project developed two semi-independent projects: *JAX-WS RI, the Reference implementation of the
JAX-WS The Jakarta XML Web Services (JAX-WS; formerly Java API for XML Web Services) is a Jakarta EE API for creating web services, particularly SOAP services. JAX-WS is one of the Java XML programming APIs. Overview The JAX-WS 2.2 specificatioJSR ...
specification * WSIT, a Java implementation of some of the WS-* and an enhanced support for interoperability with the
.NET Framework The .NET Framework (pronounced as "''dot net"'') is a proprietary software framework developed by Microsoft that runs primarily on Microsoft Windows. It was the predominant implementation of the Common Language Infrastructure (CLI) until bein ...
. 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.


Features

Metro compares well with other web service frameworks in terms of functionality. Codehaus started a comparison which compared
Apache Axis Apache Axis (Apache eXtensible Interaction System) is an open-source, XML based Web service framework. It consists of a Java and a C++ implementation of the SOAP server, and various utilities and APIs for generating and deploying Web servic ...
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. Metro includes JAXB RI,
JAX-WS The Jakarta XML Web Services (JAX-WS; formerly Java API for XML Web Services) is a Jakarta EE API for creating web services, particularly SOAP services. JAX-WS is one of the Java XML programming APIs. Overview The JAX-WS 2.2 specificatioJSR ...
RI, SAAJ RI, SJSXP, and WSIT, along with libraries that those components depend on, such as xmlstreambuffer, mimepull, etc. 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 Asynchrony Supported WS-* Standards 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 Java Platform, Standard Edition (Java SE) is a computing platform for development and deployment of portable code for desktop and server environments. Java SE was formerly known as Java 2 Platform, Standard Edition (J2SE). The platform uses ...
6 in order to allow consumers of Java SE 6 to consume Web Services. Metro is bundled with numerous application servers such as: *
GlassFish GlassFish is an open-source Jakarta EE platform application server project started by Sun Microsystems, then sponsored by Oracle Corporation, and now living at the Eclipse Foundation and supported by Payara, Oracle and Red Hat. The supported ...
* Sun Java System Application Server Platform Edition 9.x *
Oracle WebLogic Server Oracle WebLogic Server is a Java EE application server currently developed by Oracle Corporation. Oracle acquired WebLogic Server when it purchased BEA Systems in 2008. Application Server versions * WebLogic Server 14c (14.1.1) - March 30, 2 ...
*
JBoss WildFly, formerly known as JBoss AS, or simply JBoss, is an application server written by JBoss, now developed by Red Hat. WildFly is written in Java and implements the Java Platform, Enterprise Edition (Java EE) specification. It runs on multi ...
(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 Apache CXF is an open source software project developing a Web services framework. It originated as the combination of Celtix developed by IONA Technologies and XFire developed by a team hosted at Codehaus in 2006. These two projects were combi ...
) and Application Servers.


References


External links

*
Eclipse Metro
project as a part of Eclipse Enterprise for Java (EE4J) {{GlassFish Web services Java enterprise platform Free software programmed in Java (programming language)