| Title: Remote Object Persistence Tutorial WebService |
| |
| <H2><A name="RemoteObjectPersistenceTutorialWebService-SettingupDependencies"></A>Setting up Dependencies</H2> |
| |
| <P>Now lets get back to the <TT>"tutorial"</TT> project that contains a web application and set up dependencies. The only extra one that we don't have yet is <TT>resin-hessian.jar</TT>, just like the client, so let's add it (and the caucho repo declaration) to the <TT>pom.xml</TT>.</P> |
| |
| <DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent"> |
| <PRE class="code-java"><project xmlns=<SPAN class="code-quote">"http:<SPAN class="code-comment">//maven.apache.org/POM/4.0.0"</SPAN> xmlns:xsi=<SPAN class="code-quote">"http://www.w3.org/2001/XMLSchema-instance"</SPAN> |
| </SPAN> xsi:schemaLocation=<SPAN class="code-quote">"http:<SPAN class="code-comment">//maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"</SPAN>> |
| </SPAN> ... |
| <dependencies> |
| ... |
| <dependency> |
| <groupId>com.caucho</groupId> |
| <artifactId>resin-hessian</artifactId> |
| <version>3.1.6</version> |
| </dependency> |
| </dependencies> |
| |
| <build> |
| ... |
| </build> |
| |
| <repositories> |
| <repository> |
| <id>caucho</id> |
| <name>Caucho Repository</name> |
| <url>http:<SPAN class="code-comment">//caucho.com/m2</url> |
| </SPAN> <layout><SPAN class="code-keyword">default</SPAN></layout> |
| <snapshots> |
| <enabled><SPAN class="code-keyword">false</SPAN></enabled> |
| </snapshots> |
| <releases> |
| <enabled><SPAN class="code-keyword">true</SPAN></enabled> |
| </releases> |
| </repository> |
| </repositories> |
| </project></PRE> |
| </DIV></DIV> |
| |
| <DIV class="panelMacro"><TABLE class="noteMacro"><COLGROUP><COL width="24"><COL></COLGROUP><TR><TD valign="top"><IMG src="http://cayenne.apache.org/docs/3.0/images/icons/emoticons/warning.gif" width="16" height="16" align="absmiddle" alt="" border="0"></TD><TD><B>Maven Optimization Hint</B><BR>On a real project both server and client modules will likely share a common parent pom.xml where common repository delcaration can be placed, with child pom's "inheriting" it from parent. This would reduce build code duplication.</TD></TR></TABLE></DIV> |
| |
| <H2><A name="RemoteObjectPersistenceTutorialWebService-ClientClassesontheServer"></A>Client Classes on the Server</H2> |
| |
| <P>Since ROP web service requires both server and client persistent classes, we need to generate a second copy of the client classes inside the server project (see instructions <A href="remote-object-persistence-tutorial-client-project.html" title="Remote Object Persistence Tutorial Client Project">here</A>, just pick the server project as a class generation target). This is a minor inconvenience that will hopefully go away in the future versions of Cayenne. <EM>Don't forget to refresh the project in Eclipse after class generation is done.</EM></P> |
| |
| <H2><A name="RemoteObjectPersistenceTutorialWebService-Configuring%7B%7Bweb.xml%7D%7D"></A>Configuring <TT>web.xml</TT></H2> |
| |
| <P>Cayenne web service is declared in the <TT>web.xml</TT>. It is implemented as a servlet <TT>"org.apache.cayenne.remote.hessian.service.HessianServlet"</TT>. Open <TT>tutorial/src/main/webapp/WEB-INF/web.xml</TT> in Eclipse and add a service declaration (you may keep the Cayenne filter declaration left there <A href="tutorial-webapp.html" title="Tutorial Webapp">from the previous tutorial</A>, or you can start clean, either way will work) : </P> |
| |
| <DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent"> |
| <PRE class="code-java"><?xml version=<SPAN class="code-quote">"1.0"</SPAN> encoding=<SPAN class="code-quote">"utf-8"</SPAN>?> |
| <!DOCTYPE web-app |
| PUBLIC <SPAN class="code-quote">"-<SPAN class="code-comment">//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"</SPAN> |
| </SPAN> <SPAN class="code-quote">"http:<SPAN class="code-comment">//java.sun.com/dtd/web-app_2_3.dtd"</SPAN>> |
| </SPAN><web-app> |
| <display-name>Cayenne Tutorial</display-name> |
| <servlet> |
| <servlet-name>cayenne-service</servlet-name> |
| <servlet-class>org.apache.cayenne.remote.hessian.service.HessianServlet</servlet-class> |
| </servlet> |
| <servlet-mapping> |
| <servlet-name>cayenne-service</servlet-name> |
| <url-pattern>/cayenne-service</url-pattern> |
| </servlet-mapping> |
| </web-app></PRE> |
| </DIV></DIV> |
| |
| <DIV class="panelMacro"><TABLE class="noteMacro"><COLGROUP><COL width="24"><COL></COLGROUP><TR><TD valign="top"><IMG src="http://cayenne.apache.org/docs/3.0/images/icons/emoticons/warning.gif" width="16" height="16" align="absmiddle" alt="" border="0"></TD><TD><B>Extending Server Behavior via Callbacks</B><BR>While no custom Java code is required on the server, just a service declaration, it is possible to customizing server-side behavior via <A href="lifecycle-callbacks.html" title="Lifecycle Callbacks">callbacks and listeners</A> (not shown in the tutorial).</TD></TR></TABLE></DIV> |
| |
| |
| <H2><A name="RemoteObjectPersistenceTutorialWebService-RunningROPServer"></A>Running ROP Server</H2> |
| |
| <P>Use <A href="tutorial-webapp.html" title="Tutorial Webapp">previosly created</A> Eclipse Jetty run configuration available via <TT>"Run > Run Configurations..."</TT> (or <A href="tutorial-webapp.html" title="Tutorial Webapp">create a new one</A> if none exists yet). You should see output in the Eclipse console similar to the following:</P> |
| |
| <DIV class="preformatted panel" style="border-width: 1px;"><DIV class="preformattedContent panelContent"> |
| <PRE>[INFO] Scanning for projects... |
| [INFO] ------------------------------------------------------------------------ |
| [INFO] Building Cayenne Tutorial |
| [INFO] |
| [INFO] Id: org.example.cayenne:tutorial:jar:0.0.1-SNAPSHOT |
| [INFO] task-segment: [jetty:run] |
| [INFO] ------------------------------------------------------------------------ |
| ... |
| [INFO] [jetty:run] |
| [INFO] Configuring Jetty for project: Cayenne Tutorial |
| [INFO] Webapp source directory = /Users/andrus-tutorial/Desktop/work/tutorial/src/main/webapp |
| ... |
| [INFO] Starting jetty 6.1.22 ... |
| 2010-01-16 17:22:16.906:INFO::jetty-6.1.22 |
| 2010-01-16 17:22:17.027:INFO::No Transaction manager found - if your webapp requires one, please configure one. |
| INFO: started configuration loading. |
| INFO: loaded domain: UntitledDomain |
| INFO: loaded <map name='UntitledDomainMap' location='UntitledDomainMap.map.xml'>. |
| INFO: loading <node name='UntitledDomainNode' datasource='UntitledDomainNode.driver.xml' |
| factory='org.apache.cayenne.conf.DriverDataSourceFactory' schema-update-strategy='org.apache.cayenne.access.dbsync.CreateIfNoSchemaStrategy'>. |
| INFO: using factory: org.apache.cayenne.conf.DriverDataSourceFactory |
| INFO: loading driver information from 'UntitledDomainNode.driver.xml'. |
| INFO: loading driver org.apache.derby.jdbc.EmbeddedDriver |
| INFO: loading user name and password. |
| INFO: Created connection pool: jdbc:derby:memory:testdb;create=true |
| Driver class: org.apache.derby.jdbc.EmbeddedDriver |
| Min. connections in the pool: 1 |
| Max. connections in the pool: 1 |
| INFO: loaded datasource. |
| INFO: no adapter set, using automatic adapter. |
| INFO: loaded map-ref: UntitledDomainMap. |
| INFO: finished configuration loading in 549 ms. |
| 2010-01-16 17:22:17.960:INFO::Started SelectChannelConnector@0.0.0.0:8080</PRE> |
| </DIV></DIV> |
| |
| <P>Cayenne ROP service URL is <A href="http://localhost:8080/tutorial/cayenne-service" class="external-link" rel="nofollow">http://localhost:8080/tutorial/cayenne-service</A>. If you click on it, you will see <TT>"Hessian Requires POST"</TT> message, that means that the service is alive, but you need a client other than the web browser to access it.</P> |
| |
| <HR> |
| <P><B>Next Step: <A href="remote-object-persistence-tutorial-client-code.html" title="Remote Object Persistence Tutorial Client Code">Remote Object Persistence Tutorial Client Code</A></B></P> |
| <HR> |
