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<?xml version="1.0" encoding="iso-8859-1"?>

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<document xmlns="http://maven.apache.org/XDOC/2.0"

          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

          xsi:schemaLocation="http://maven.apache.org/XDOC/2.0 http://maven.apache.org/xsd/xdoc-2.0.xsd">

    <properties>

        <title>Application Server Specific Configuration Guide</title>

    </properties>

    <body>

        <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>

        <section name="WebLogic">

            <subsection name="Use exploded configuration to deploy Axis2 WAR">

                <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 &lt;prefer-web-inf-classes&gt; to ensure that

                JARs packaged in Axis2 WAR are picked up from WEB-INF/lib. You can

                do this by setting the &lt;prefer-web-inf-classes&gt; element in

                WEB-INF/weblogic.xml to true. An example of weblogic.xml is shown

                below:</p>

<pre>

&lt;weblogic-web-app&gt;

 &lt;container-descriptor&gt;

    &lt;prefer-web-inf-classes&gt;true&lt;/prefer-web-inf-classes&gt;

  &lt;/container-descriptor&gt;

&lt;/weblogic-web-app&gt;

</pre>

                <p>If set to true, the &lt;prefer-web-inf-classes&gt; 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 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 href=

                "http://e-docs.bea.com/wls/docs81/webapp/deployment.html">Redeploying

                a Web Application in Exploded Directory Format</a></li>

                </ul>

            </subsection>

            <subsection name="Lack of namespacing on serialised items">

                <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>

<pre>

&lt;prefer-application-packages&gt;

&lt;package-name&gt;com.ctc.wstx.*&lt;/package-name&gt;

&lt;package-name&gt;javax.xml.*&lt;/package-name&gt;

&lt;package-name&gt;org.apache.*&lt;/package-name&gt;

&lt;/prefer-application-packages&gt;

</pre>

                <p>Note that the libraries listed--Xerces, StAX API, Woodstox--need

                to be on the application classpath.</p>

            </subsection>

        </section>

        <section name="WebSphere">

            <subsection name="Avoiding conflicts with WebSphere's JAX-WS runtime">

                <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>

                    <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 <em>Manage Modules</em> and locate the WAR containing

                        Axis2 (in the default WAR distribution, the module is called <em>Apache-Axis2</em>), then

                        change the <em>Class loader order</em> option to <em>Classes loaded with local class

                        loader first (parent last)</em>. Note that the class loader policy for the enterprise

                        application itself (which can be specified under <em>Class loading and update detection</em>)

                        is irrelevant, unless a custom EAR distribution is used that includes the Axis2 libraries

                        in the EAR instead of the WAR.

                    </li>

                </ol>

            </subsection>

            <subsection name="Deploying services and modules">

                <p>

                    By default (i.e. if the <em>Distribute application</em> 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>

            </subsection>

            <subsection name="Deploying older Axis2 versions">

                <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 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>

            </subsection>

            <subsection name="Known issues">

                <p>

                    On some WAS versions the following error may occur, e.g. when accessing a WSDL exposed by Axis2:

                </p>

<pre>java.lang.VerifyError: JVMVRFY013 class loading constraint violated;

class=org/apache/xerces/dom/CoreDocumentImpl, method=getDomConfig()Lorg/w3c/dom/DOMConfiguration</pre>

                <p>

                    This is caused by the XmlBeans library

                    packaged with Axis2. This library contains a set of interfaces in the <code>org.w3c.dom</code> 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 <code>org.w3c.dom</code> package from the XmlBeans library.

                </p>

            </subsection>

        </section>

    </body>

</document>