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JBoss Web Services

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  1. JBoss Web Services Stuart Wheater Arjuna Technologies

  2. Contents • The purpose of this presentation is to summaries some of the issues involved in using web services on JBoss • Cover: • Overview of JBoss web services support • Publishing web services • Consuming web services • Overview of “JBossNetExample”

  3. JBoss Web Service Support • JBoss.net • JBoss.net is a plug-in to the JBoss application server that support Web Services • Goals • Painless implementation and publication of J2EE-based Web Services • EJB and JMX • Seamless integration of external Web Services running on other business platforms into the J2EE environment

  4. JBoss.net Team • Lead Developer: Dr. Christoph Jung (Germany) • Web pages: http://www.jboss.org/developers/projects/jboss/dotnet.jsp • The JBoss.net team is integrating Apache Axis into JBoss • JBoss 3.0.6 (26th January 2003) • Axis-1.0-beta1 (15th March 2002) • JBoss 3.2.0-RC1 (14th January 2003) • Axis-1.0 (7th October 2002) • JBoss.net is only available when using the “all” server environment • Start JBoss with the command: “run.sh -c all” or “run.bat -c all”

  5. Apache Axis • Axis is a SOAP engine, implemented in Java • A framework for constructing SOAP processors such as clients, servers, gateways • Began life as IBM’s SOAP4J • Third generation of Apache SOAP engine • License: The Apache Software License, Version 1.1 • Latest version is Axis-1.1-RC1 • 9th February 2003 • http://ws.apache.org/axis/dist/1_1RC1/ • Axis-1.1 release planned for late February

  6. Publishing Web Services • Implementation techniques • JAX-RPC • Does not support JAXM • Axis’s proprietary support • jws files • Deployment techniques • AdminClient • “WSR” file • Auto deploy source (jws files)

  7. JAX-RPC: High-level Service Interface • Standards compliant “Java object” level interface • Java™ API for XML-based RPC (JAX-RPC) 1.0 • Java package javax.xml.rpc • Implement a web service • “Service Endpoint” interface • Java interface which defines method and parameters of web service • Can be created using the WSDL2Java tool • Provide an implementation of the “Service Endpoint” interface • Axis provider type “java:RPC” • Other features: • Standards compliant API for Lifecycle event notification: init() and destroy() • Standards compliant API for request and response interception

  8. Axis’s Low-level Service Interface • Axis provides a proprietary XML oriented interface • SOAP engine uses Java reflection to analysis deployed class for suitable method to call. • Axis-1.0-beta1 (JBoss-3.0.6) • org.w3c.dom.Element[] method(java.util.Vector) • org.w3c.dom.Element[] method(org.apache.axis.MessageContext, java.util.Vector) • org.w3c.dom.Document method(org.w3c.dom.Document) • org.w3c.dom.Document method(org.apache.axis.MessageContext, org.w3c.dom.Document) • org.w3c.dom.Document method(org.apache.axis.MessageContext) • Axis-1.0 (JBoss-3.2.0-RC1) • org.apache.axis.message.SOAPBodyElement[] method(org.apache.axis.message.SOAPBodyElement) • org.w3c.dom.Element[] method(org.w3c.dom.Element[]) • org.w3c.dom.Document method(org.w3c.dom.Document) • void method(org.apache.axis.message.SOAPEnvelope, org.apache.axis.message.SOAPEnvelope) • Axis provider type “java:MSG”

  9. Axis’s Ultra-low-level Service Interface • Axis provides a raw engine interface • Register own “provider class” • Extension of the org.apache.axis.providers.BasicProvider class • void invoke(org.apache.axis.MessageContext) • void generateWSDL(org.apache.axis.MessageContext) • . . . • In deployment descriptor: • <service … provide=“java:org.eu.adapt.AdaptableProvider”>

  10. jws File: Very-Easy Service Interface • jws file provide a very simple technique to implementing and deploying web service • jws files contain Java source, but with a “jws” postfix. • Calculator.jws: • public class Calculator{ public int add(int v1, int v2) { return v1 + v2; }} • Deployed by simply copying jws file to • <jboss home>/server/all/deploy/jboss-net.sar/jboss-net.war • Engine will compile java and export methods as web service • Very useful for test web services • This does not seem to work with JBoss-3.2.0-RC1

  11. Deployment descriptor (WSDD file) • Deployment in Axis is based on XML descriptions in WSDD files • Example • <deployment xmlns="http://xml.apache.org/axis/wsdd/" xmlns:java="http://xml.apache.org/axis/wsdd/providers/java"> <service name="JAXRPCCountersService" provider="java:RPC"> <parameter name="className“ value="org.eu.adapt.wsexample.ws.JAXRPCCountersImpl"/> <parameter name="allowedMethods" value="create remove set get increase"/> <parameter name="scope" value="Application"/> </service></deployment> • Request, response and fault interceptors • <requestFlow> <handler . . ./></requestFlow>

  12. Deployment using AdminClient • Axis provides an administration program which allows web services to be registered and administer remotely • org.apache.axis.client.AdminClient • To publish a web service • Need to copy a jar with web services implementation to: • <jboss home>/server/all/deploy/jboss-net.sar • Then run AdminClient with web service’s WSDD file as an argument

  13. wsr File • JBoss.net have provided a more convenient technique for deploying web service, using wsr files • wsr files are a form of jar file • Contains the Java classes which implement the web service • Deployment descriptor is place in the file: • “META-INF/web-service.xml” • The wsr file can be included in ear files. • <module><java>wsexample.wsr</java></module>

  14. Consuming Web Services • Implementation techniques • JAX-RPC • Standards compliant “Java object” oriented interface • WSDL2Java tool • Generate client stubs and service locator • SAAJ • Standards compliant XML oriented interface • SOAP with Attachments API for Java • Axis’s proprietary API • Axis provides a proprietary XML oriented interface

  15. Overview of “JBossNetExample” • The example consists of a set of simple counters (create, remove, set, get & increase) which are available as web service. • The implementation of this service uses JAX-RPC • EJBs (CMP Entity Beans) to manage persistent state. • ant build script • Compilation of Java source • Creation of jar, wsr & ear files • Deployment • JBoss-3.0.5 (based on axis-1.0-beta1)