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| <section> |
| <h2><a name="Frequently_Asked_Questions_on_Apache_Axis2"></a><a name="top">Frequently Asked Questions on Apache Axis2</a></h2> |
| <p><b>General</b></p> |
| <ol style="list-style-type: decimal"> |
| <li><a href="#a1"> |
| I'm having a problem using Axis2. What should I do? |
| </a></li> |
| <li><a href="#mailinglists"> |
| How to ask a question on the mailing list? |
| </a></li></ol> |
| <p><b>Class Loading Issues</b></p> |
| <ol style="list-style-type: decimal"> |
| <li><a href="#b1"> |
| How do I access resources that I put into my service or module archive file? |
| </a></li></ol> |
| <p><b>Client API</b></p> |
| <ol style="list-style-type: decimal"> |
| <li><a href="#c1"> |
| I want to do Request-Response Messaging, Where should I look? |
| </a></li> |
| <li><a href="#c2"> |
| I want to do One Way Messaging, Where should I look? |
| </a></li> |
| <li><a href="#c3"> |
| When I try to do a non blocking call with <tt>useSeparateListener=true</tt> I get the error <i>to do two Transport Channels the Addressing |
| Modules must be engaged</i>, Why is this? |
| </a></li> |
| <li><a href="#c4"> |
| I have engaged addressing, and |
| when I try to invoke a service I get an exception |
| </a></li> |
| <li><a href="#c5"> |
| What is Axis2 Repository? |
| </a></li></ol> |
| <p><b>Services</b></p> |
| <ol style="list-style-type: decimal"> |
| <li><a href="#e1"> |
| How do I have multiple services in one service archive? |
| </a></li> |
| <li><a href="#f1"> |
| I see an internal server error page when I try to view the WSDL file. |
| </a></li></ol> |
| <p><b>Databindings</b></p> |
| <ol style="list-style-type: decimal"> |
| <li><a href="#unexpected_subelement"> |
| When using ADB, I get an "Unexpected subelement" exception. Is this a bug? |
| </a></li></ol></section><section> |
| <h2><a name="General"></a>General</h2> |
| <dl> |
| <dt><a name="a1"> |
| I'm having a problem using Axis2. What should I do? |
| </a></dt> |
| <dd> |
| |
| <p>First make sure you go through the user guide and this FAQ. If |
| you are using a released version of Axis2, then there is a |
| possibility that your problem has already being fixed in the latest |
| code. Download Axis2 nightly builds and test again. You can download |
| the complete snapshot distributions from our |
| <a class="externalLink" href="https://hudson.apache.org/hudson/job/Axis2/lastStableBuild/org.apache.axis2$distribution">Hudson |
| continuous integration server</a> and individual JARs from our |
| <a class="externalLink" href="http://repository.apache.org/snapshots/org/apache/axis2/">snapshot repository</a>. The |
| snapshot repository is also the best choice if you are using Maven to build your project. |
| </p> |
| |
| <p>If the problem still persists, then try to search for your |
| question in our <a class="externalLink" href="http://marc.theaimsgroup.com/?l=axis-dev&r=1&w=2">developer</a> |
| or <a class="externalLink" href="http://marc.theaimsgroup.com/?l=axis-user&r=1&w=2">user</a> |
| mailing archives as it might have already being answered.</p> |
| |
| <p>If your problem is not answered in the mailing list, now is the |
| best time to post your question to the axis-user mailing list (see next question). If |
| you think it is a bug, please fill a bug report in <a class="externalLink" href="http://issues.apache.org/jira/browse/AXIS2">JIRA</a>. Please |
| attach all the supportive information, like your wsdl, schema, |
| clients, services, stacktraces, etc., to the JIRA issue you |
| created, as it will help one of our contributors to re-create the |
| problem. <b>PLEASE DO NOT ASK QUESTIONS USING JIRA; USE IT ONLY AS |
| AN ISSUE TRACKER.</b></p> |
| |
| <p>If you are asking for an explanation of a feature in Axis2, |
| there is a possibility that there is an article or FAQ written on |
| it. Please search the web as there are lots of articles written and |
| hosted by various sources on the web.</p> |
| <hr /></dd> |
| <dt><a name="mailinglists"> |
| How to ask a question on the mailing list? |
| </a></dt> |
| <dd> |
| |
| <p> |
| If you have a question that has not been answered elsewhere (see previous question), |
| you may ask it on one of the mailing lists: |
| </p> |
| |
| <ul> |
| |
| <li>Users : <a class="externalLink" href="mailto:java-user@axis.apache.org">java-user@axis.apache.org</a></li> |
| |
| <li>Developers : <a class="externalLink" href="mailto:java-dev@axis.apache.org">java-dev@axis.apache.org</a></li> |
| </ul> |
| |
| <p> |
| Before posting to a list, you need to <a href="mail-lists.html">subscribe</a> first. |
| Since the mailing lists are shared with other subprojects (such as Rampart), please |
| prefix the subject with <tt>[Axis2]</tt>. |
| </p> |
| |
| <p><b>Note</b> : When you ask questions in the mailing list, please |
| remember that everyone working in our project are volunteers. |
| No-one can be forced to fix your bugs (See <a class="externalLink" href="http://www.apache.org/foundation/faq.html#what-is-apache-NOT-about"> |
| What is Apache not about?</a> ).</p> |
| |
| <p>Make sure you add enough information about your problem with |
| stacktraces and any other supportive information. It will improve |
| the chances of your question being answered. Prefixing your mail |
| subject with prefixes like "URGENT" will not help you in any means. |
| Yes we also accept all the blames about Axis2 in these mailing |
| lists, as those will definitely help us to improve Axis2 :) .</p> |
| </dd></dl></section><section> |
| <h2><a name="Class_Loading_Issues"></a>Class Loading Issues</h2> |
| <dl> |
| <dt><a name="b1"> |
| How do I access resources that I put into my service or module archive file? |
| </a></dt> |
| <dd> |
| |
| <p>Axis2 has the notion of service isolation where each service or |
| module gets its own class loader. Using this class loader you can |
| access any resource that you put into your service archive file. |
| You may want to access your resources from different locations. For |
| example,</p> |
| |
| <ol style="list-style-type: decimal"> |
| |
| <li> |
| |
| <p>A third party module wants to access your resources. Then the |
| scenario is as follows:</p> |
| |
| <div> |
| <pre> |
| AxisService myService = |
| messageContext.getAxisConfiguration().getAxisService("serviceName"); |
| </pre></div> |
| |
| <p>or</p> |
| |
| <div> |
| <pre> |
| AxisService myService = msgCtx.getAxisService(); |
| </pre></div> |
| |
| <p>Then you can use the service class loader through which you can |
| access its resources</p> |
| |
| <div> |
| <pre> |
| ClassLoader clsLoader = myService.getServiceClassLoader(); |
| clsLoader.getResourceAsStream("myResource"); |
| </pre></div> |
| </li> |
| |
| <li> |
| |
| <p>To initialize the service implementation class at the |
| MessageReceiver level, the following steps need to be taken</p> |
| |
| <div> |
| <pre> |
| AxisService service = msgCtx.getAxisService(); |
| ClassLoader clsLoader = service.getServiceClassLoader(); |
| Class.forName("serviceName",clsLoader,true); |
| </pre></div> |
| |
| <p>NOTE : Axis2 default MessageReciver uses the same technique to |
| initialize service implementations</p> |
| </li> |
| |
| <li> |
| |
| <p>If you want to load your resources at the service |
| implementation class, then the scenario is as follows</p> |
| |
| <div> |
| <pre> |
| getClass().getClassLoader().getResourceAsStream("myResource"); |
| </pre></div> |
| </li> |
| </ol> |
| </dd></dl></section><section> |
| <h2><a name="Client_API"></a>Client API</h2> |
| <dl> |
| <dt><a name="c1"> |
| I want to do Request-Response Messaging, Where should I look? |
| </a></dt> |
| <dd> |
| |
| <p>Look at the <a class="externalLink" href="https://svn.apache.org/repos/asf/axis/axis2/java/core/trunk/modules/kernel/src/org/apache/axis2/client/ServiceClient.java">ServiceClient</a> class, for more information |
| please read the <a href="docs/adv-userguide.html">User's Guide</a></p> |
| <hr /></dd> |
| <dt><a name="c2"> |
| I want to do One Way Messaging, Where should I look? |
| </a></dt> |
| <dd> |
| |
| <p>From Axis2 0.94 onwards, both request-response and one way |
| messaging will be handled by <a class="externalLink" href="https://svn.apache.org/repos/asf/axis/axis2/java/core/trunk/modules/kernel/src/org/apache/axis2/client/ServiceClient.java">ServiceClient</a>.</p> |
| <hr /></dd> |
| <dt><a name="c3"> |
| When I try to do a non blocking call with <tt>useSeparateListener=true</tt> I get the error <i>to do two Transport Channels the Addressing |
| Modules must be engaged</i>, Why is this? |
| </a></dt> |
| <dd> |
| |
| <p>To do the two transport channel invocation, you need to engage |
| the addressing module. You can enable it by un-commenting the entry |
| in the axis2.xml file or <code>Call.engageModule(QName)</code>. However, |
| addressing is enabled by default.</p> |
| <hr /></dd> |
| <dt><a name="c4"> |
| I have engaged addressing, and |
| when I try to invoke a service I get an exception |
| </a></dt> |
| <dd> |
| |
| <p>If you have engaged addressing, then you must have wsa:action, |
| the required WS-Addressing header. You have to call |
| <code>option.setAction("urn:myaction");</code>. Note that the |
| action should be a URI.</p> |
| <hr /></dd> |
| <dt><a name="c5"> |
| What is Axis2 Repository? |
| </a></dt> |
| <dd> |
| |
| <p>The Repository stores the configuration of Axis2. The users |
| should specify the repository folder of the Axis Server (HTTP or |
| TCP). In the case of Tomcat, it is the webapps/axis2/WEB-INF |
| folder. The following picture shows a sample repository.</p> |
| <img src="images/faq/1.jpg" alt="Sample repository" /></img> |
| |
| <p>Modules and services have an archive format defined and they are |
| automatically picked up by Axis2 when they are copied to |
| corresponding folders.</p> |
| </dd></dl></section><section> |
| <h2><a name="Services"></a>Services</h2> |
| <dl> |
| <dt><a name="e1"> |
| How do I have multiple services in one service archive? |
| </a></dt> |
| <dd> |
| |
| <p>It's just a matter of writing a services.xml file to configure |
| the service or services in an archive file. The corresponding |
| services.xml <strong>must</strong> look as follows,</p> |
| |
| <div> |
| <pre> |
| <serviceGroup> |
| <service <strong>name="myService1"</strong>> |
| ........................... |
| </service> |
| |
| <service <strong>name="myService2"</strong>> |
| ........................... |
| </service> |
| <serviceGroup> |
| </pre></div> |
| |
| <p>NOTE : The name attribute is a compulsory attribute that will |
| become the name of the services. If you want to have one service in |
| the archive file, then there are two options. You can either have |
| one service inside the serviceGroup tag or have only one service |
| tag, as shown below, in your services.xml, in which case, the name |
| of the service will be the name of the archive file, which you |
| cannot override.</p> |
| |
| <div> |
| <pre> |
| <service> |
| ............... |
| <service> |
| </pre></div> |
| <hr /></dd> |
| <dt><a name="f1"> |
| I see an internal server error page when I try to view the WSDL file. |
| </a></dt> |
| <dd> |
| |
| <p>This happens specifically with Tomcat 4.x and 5.0 in a JDK 1.5 |
| environment. The reason is that the system picks up a wrong |
| transformer factory class. This can be solved simply by putting the |
| <a class="externalLink" href="http://www.apache.org/dist/java-repository/xalan/jars/">xalan-2.7.0.jar</a> |
| into the axis2/WEB-INF/lib directory</p> |
| </dd></dl></section><section> |
| <h2><a name="Databindings"></a>Databindings</h2> |
| <dl> |
| <dt><a name="unexpected_subelement"> |
| When using ADB, I get an "Unexpected subelement" exception. Is this a bug? |
| </a></dt> |
| <dd> |
| |
| <p> |
| In general, "Unexpected subelement" means that the message being processed |
| doesn't conform to the WSDL that was used to generate the ADB code. If you are getting |
| this exception on the client side, it means that the response from the server |
| is invalid. If you are seeing the error on the server side, it means that the |
| request received by the service is invalid. |
| </p> |
| |
| <p> |
| If you are sure that the message conforms to the WSDL and believe that there |
| is an issue with the code generated by Axis2, you should do the following before |
| opening a JIRA issue: |
| </p> |
| |
| <ol style="list-style-type: decimal"> |
| |
| <li> |
| Test the scenario with the latest Axis2 snapshot version. This includes |
| regenerating the code with the latest codegen version. |
| </li> |
| |
| <li> |
| Provide the WSDL that causes the issue, or if for legal reasons you are not |
| allowed to provide the original WSDL, provide a minimal WSDL that reproduces |
| the problem. |
| </li> |
| |
| <li> |
| Provide some hard evidence that this is indeed an issue in Axis2. This means |
| at least a transcript of the SOAP message that proves that it conforms to the WSDL. |
| </li> |
| </ol> |
| </dd></dl></section> |
| </div> |
| </div> |
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