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| |
| <h1>Application Server Specific Configuration Guide</h1> |
| |
| <p>This document provides configuration information required for |
| your Application Server to run Apache Axis2 to its fullest |
| potential.</p> |
| |
| <div class="section"> |
| <h2><a name="WebLogic"></a>WebLogic</h2> |
| |
| <div class="section"> |
| <h3><a name="Use_exploded_configuration_to_deploy_Axis2_WAR"></a>Use exploded configuration to deploy Axis2 WAR</h3> |
| |
| <p>We recommend using the exploded configuration to deploy Axis2 |
| WAR in WebLogic application server to support the |
| hotupdate/ hotdeployment features in Axis2. However, if you want to |
| deploy custom WARs, say in a clustering environment, you need to |
| add two additional files into the WEB-INF named "services.list" and |
| "modules.list" under the modules and services directory |
| respectively.</p> |
| |
| <ul> |
| |
| <li><b>WEB-INF/services/services.list</b> : should list all the |
| services (aar files) that you want to expose.</li> |
| |
| <li><b>WEB-INF/modules/modules.list</b> : should list all the |
| modules (mar files) that you want to use.</li> |
| </ul> |
| NOTE: In both cases, please list one entry per line. |
| |
| <p>WebLogic ships with JARs that conflict with JARs present in |
| Axis2. Therefore use <prefer-web-inf-classes> to ensure that |
| JARs packaged in Axis2 WAR are picked up from WEB-INF/lib. You can |
| do this by setting the <prefer-web-inf-classes> element in |
| WEB-INF/weblogic.xml to true. An example of weblogic.xml is shown |
| below:</p> |
| |
| <div> |
| <pre> |
| <weblogic-web-app> |
| <container-descriptor> |
| <prefer-web-inf-classes>true</prefer-web-inf-classes> |
| </container-descriptor> |
| </weblogic-web-app> |
| </pre></div> |
| |
| <p>If set to true, the <prefer-web-inf-classes> element will |
| force WebLogic's classloader to load classes located in the WEB-INF |
| directory of a Web application in preference to application or |
| system classes. This is a recommended approach since it only |
| impacts a single Web module.</p> |
| |
| <p>Please refer to the following documents in WebLogic |
| for more information:</p> |
| |
| <ul> |
| |
| <li><a class="externalLink" href="http://e-docs.bea.com/wls/docs81/programming/classloading.html">WebLogic |
| ServerApplication Classloading</a>- For more information on how |
| WebLogic's class loader works</li> |
| |
| <li><a class="externalLink" href="http://e-docs.bea.com/wls/docs81/webapp/deployment.html">Redeploying |
| a Web Application in Exploded Directory Format</a></li> |
| </ul> |
| </div> |
| |
| <div class="section"> |
| <h3><a name="Lack_of_namespacing_on_serialised_items"></a>Lack of namespacing on serialised items</h3> |
| |
| <p>BEA WebLogic Server 9.0 comes with its own StAX implementation. |
| This results in lack of namespacing on serialised items. In turn, |
| WebLogic server (WLS) breaks with AXIOM on the WLS classpath. Hence |
| a filtering classloader is required:</p> |
| |
| <p>Adding the following to weblogic-application.xml should resolve |
| this issue:</p> |
| |
| <div> |
| <pre> |
| <prefer-application-packages> |
| <package-name>com.ctc.wstx.*</package-name> |
| <package-name>javax.xml.*</package-name> |
| <package-name>org.apache.*</package-name> |
| </prefer-application-packages> |
| </pre></div> |
| |
| <p>Note that the libraries listed--Xerces, StAX API, Woodstox--need |
| to be on the application classpath.</p> |
| </div> |
| </div> |
| |
| <div class="section"> |
| <h2><a name="WebSphere"></a>WebSphere</h2> |
| |
| <div class="section"> |
| <h3><a name="Avoiding_conflicts_with_WebSpheres_JAX-WS_runtime"></a>Avoiding conflicts with WebSphere's JAX-WS runtime</h3> |
| |
| <p> |
| The JAX-WS runtime in WebSphere Application Server is based on a modified version of Axis2 and these |
| classes are visible to application class loaders. This means that when deploying |
| a standard version of Axis2 on WAS 7.0 (and WAS 6.1 with the Web Services feature pack installed), |
| special configuration is required to avoid conflicts with the Axis2 classes used internally by WebSphere. |
| In particular it is necessary to change the class loader policy of the Web module to parent last. However, |
| this is not sufficient because Axis2 creates additional class loaders for modules and services, and |
| these use parent first class loading by default. Therefore, two things must be done to make a standard |
| Axis2 distribution work with WebSphere: |
| </p> |
| |
| <ol style="list-style-type: decimal"> |
| |
| <li> |
| Before deploying the Axis2 WAR, edit the <tt>axis2.xml</tt> file and set the |
| <tt>EnableChildFirstClassLoading</tt> parameter to <tt>true</tt>. |
| Please note that this parameter is only supported in Axis2 1.5.5 or higher. |
| The parameter is already present in the default <tt>axis2.xml</tt> file included in the |
| WAR distribution, but its value is set to <tt>false</tt>. Therefore it is enough to change |
| the parameter value. |
| </li> |
| |
| <li> |
| After deployment, modify the application configuration to enable parent last class loading |
| for the Web module: in the WebSphere admin console, go the the configuration page for |
| the enterprise application, click on <i>Manage Modules</i> and locate the WAR containing |
| Axis2 (in the default WAR distribution, the module is called <i>Apache-Axis2</i>), then |
| change the <i>Class loader order</i> option to <i>Classes loaded with local class |
| loader first (parent last)</i>. Note that the class loader policy for the enterprise |
| application itself (which can be specified under <i>Class loading and update detection</i>) |
| is irrelevant, unless a custom EAR distribution is used that includes the Axis2 libraries |
| in the EAR instead of the WAR. |
| </li> |
| </ol> |
| </div> |
| |
| <div class="section"> |
| <h3><a name="Deploying_services_and_modules"></a>Deploying services and modules</h3> |
| |
| <p> |
| By default (i.e. if the <i>Distribute application</i> option has not been disabled explicitly) |
| WebSphere will deploy the application in exploded form. The standard location for these files is |
| in the <tt>installedApps</tt> subdirectory in the WebSphere profile directory. This means that AAR |
| and MAR files can simply be deployed by dropping them into the corresponding folders. In this |
| scenario, hot deployment is supported and there is no need to update the <tt>services.list</tt> |
| and <tt>modules.list</tt> files. |
| </p> |
| |
| <p> |
| However, the directory is still under control of WebSphere and manually deployed AAR and MAR files |
| will be removed e.g. when the application is upgraded. It may therefore be a good idea to configure |
| Axis2 to use a repository location outside of the <tt>installedApps</tt> directory. |
| </p> |
| </div> |
| |
| <div class="section"> |
| <h3><a name="Deploying_older_Axis2_versions"></a>Deploying older Axis2 versions</h3> |
| |
| <p> |
| The instructions given above apply to Axis2 1.5.5 or higher. Older versions don't support |
| the <tt>EnableChildFirstClassLoading</tt> parameter, and we don't provide any support for |
| deploying these versions on WAS 6.1 (with the Web Services feature pack installed) or 7.0. |
| However, IBM has published a <a class="externalLink" href="https://www-304.ibm.com/support/docview.wss?uid=swg21315686">technote</a> |
| with an alternative approach that may work for older Axis2 versions. |
| </p> |
| </div> |
| |
| <div class="section"> |
| <h3><a name="Known_issues"></a>Known issues</h3> |
| |
| <p> |
| On some WAS versions the following error may occur, e.g. when accessing a WSDL exposed by Axis2: |
| </p> |
| |
| <div> |
| <pre>java.lang.VerifyError: JVMVRFY013 class loading constraint violated; |
| class=org/apache/xerces/dom/CoreDocumentImpl, method=getDomConfig()Lorg/w3c/dom/DOMConfiguration</pre></div> |
| |
| <p> |
| This is caused by the XmlBeans library |
| packaged with Axis2. This library contains a set of interfaces in the <tt>org.w3c.dom</tt> package |
| and this may cause issues with class loaders that don't use a simple parent-first policy. |
| To avoid this issue, upgrade your WAS to a more recent fix pack level, remove the XmlBeans library |
| from the Axis2 WAR or remove the content of the <tt>org.w3c.dom</tt> package from the XmlBeans library. |
| </p> |
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