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Figure 15.3 Our simple web service build process. The <javac> step is only there to validate files before deployment.
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This is what our simple service looks like, with a stub implementation of our search call:
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public class SearchService { private static String lastSearch=""; private static final String[] emptyArray=new String[0]; public String[] search(String keywords) { setLastSearch(keywords); return emptyArray; } public String getLastSearchTerm() { return lastSearch; } private void setLastSearch(String keywords) { lastSearch=keywords; } }
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The methods in bold are our service methods: one for end users, the search method that always returns the same empty string array, and the other a management call to see what is going on. A real system should split the management API into a separate endpoint, so that access could be restricted, but we aren t going to worry about that here. To compile this code in Java, we have a short build file; it is so short, we include it in its entirety as listing 15.1
Listing 15.1 A build file to add a web service to an existing Axis installation
< xml version="1.0" > <project name="soapserver" default="default" basedir="." > <property name="endpoint" value="http://localhost:8080/axis/SearchService.jws"/> <property environment="env"/> <property name="build.dir" location="build"/> <property name="build.classes.dir" location="build/classes"/> <target name="default" depends="test" description="create a web service" > </target> <target name="init"> <mkdir dir="${build.classes.dir}"/> <fail unless="env.CATALINA_HOME">Tomcat not found</fail> </target> <target name="clean"> <delete dir="${build.dir}"/> </target>
CREATING A SOAP SERVICE WITH AXIS AND ANT
<target name="compile" depends="init"> <javac srcdir="soap" destdir="${build.classes.dir}" debuglevel="lines,vars,source" debug="true" includeAntRuntime="false" > </javac> </target> <target name="deploy" depends="compile"> <copy todir="${env.CATALINA_HOME}/webapps/axis/"> <fileset dir="soap" includes="**/*.java"/> <mapper type="glob" from="*.java" to="*.jws"/> </copy> </target> <target name="test" depends="deploy"> <waitfor timeoutproperty="deployment.failed" maxwait="30" maxwaitunit="second"> <http url="${endpoint} wsdl" /> </waitfor> <fail if="deployment.failed" message="application not found at ${verify.url}" /> <echo>service is live on ${endpoint}</echo> </target> </project>
The first few targets are the traditional init, clean, and compile targets; the only difference is the source directory for the compiler is now "soap" b. We do not need to add any of the Axis libraries to the classpath, because we do not reference them. All we need to do is declare public methods in our class and they become methods in a SOAP web service. We do have to be careful about our choice of datatypes if we want real interoperability; by restricting ourselves to integers, strings, and arrays of simple datatypes, we are confident that other SOAP implementations can call us. The actual deployment task is a simple copy c of all the Java files under the web directory into the CATALINA_HOME/webapps/axis/ directory tree. If we were deploying remotely, we would use FTP instead. That s it. No configuration files; no need to restart the server. If only all deployments were so simple. Simple deployment or not, we need to verify that the deployment worked. Our test target tries to retrieve the WSDL description of the service for 30 seconds d; if it is successful, it reports that the service is live and the build succeeds.
CHAPTER 1 5
WORKING WITH WEB SERVICES
ADDING WEB SERVICES TO AN EXISTING WEB APPLICATION
Now that we have shown the basics of web services and how to configure Tomcat to work with Axis, it is time to retrofit a SOAP endpoint to our existing web application. To do this we have add the appropriate libraries to the WEB-INF/lib directory, and then configure Axis to work. We need to make some changes to the web.xml configuration file to achieve that, but there we can use XDoclet.
Configuring the web application Recall that in section 12.3.2, we configured the template files used by <webdoclet> to include servlets conditionally. We now need to add the Axis configuration details to the same template files. The first step is to extract the settings from the Axis/WEB-INF/ web.xml file, so we open it in an editor and find the <servlet> and <servletmapping> tags. The servlet settings we insert into the servlets.xml file that <webdoclet> uses to build our web application s web.xml file is as follows:
<servlet> <servlet-name>AxisServlet</servlet-name> <display-name>Apache-Axis Servlet</display-name> <servlet-class> org.apache.axis.transport.http.AxisServlet </servlet-class> </servlet> <servlet> <servlet-name>AdminServlet</servlet-name> <display-name>Axis Admin Servlet</display-name> <servlet-class> org.apache.axis.transport.http.AdminServlet </servlet-class> <load-on-startup>100</load-on-startup> </servlet>
The servlet mappings file sets up the bindings of these servlets to URL patterns beneath the server, one for the Axis admin servlet, the others providing the SOAP endpoints for the service clients. We find the values further down the Axis web.xml file and paste them into our templates/servlet-mappings.xml file:
<servlet-mapping> <servlet-name>AxisServlet</servlet-name> <url-pattern>*.jws</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>AxisServlet</servlet-name> <url-pattern>/servlet/AxisServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>AxisServlet</servlet-name>
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