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From "Jarek Gawor" <>
Subject Re: class loading: LinkageError: loader constraint violation
Date Mon, 15 Dec 2008 20:31:04 GMT

Are you deploying your app on Geronimo Tomcat assembly (which uses
Axis2 as the JAX-WS provider by default)? Does your application
contain any of the axis2 jars or its dependencies (such as Axiom,
etc.)? Also, looks like your application contains some code that
extends Axis2 API. What version of Axis2 was that code built with?

In general, if you are witting a JAX-WS web services, you should stay
with the JAX-WS API in order to keep your application portable. For
example, you can use the @WebServiceRef (that is, Service AP) to
invoke other web services. If you are using proprietary Axis2 API (and
extensions of it) you have to make sure all of the code is built with
the same version of Axis2 as what is in Geronimo.


On Mon, Dec 15, 2008 at 2:12 PM, Łukasz Budnik <> wrote:
> Hi all,
> I'm exposing some methods of my SLSB as WebServices (@WebService,
> @WebMethod) etc.
> All works.
> Recently I have added new functionality. I'm invoking external web
> services using Axis2: org.apache.axis2.client.ServiceClient.
> I added this dependency:
> <dependency>
>                <groupId>org.apache.axis2</groupId>
>                <artifactId>axis2-kernel</artifactId>
>                <version>1.3</version>
>                <type>jar</type>
>            </dependency>
> During deployment of my application (and of course @WebService SLSB)
> there is an error.
>     [exec]     Error: Operation failed: start of
>     [exec]     org.xh.nuntius/EnterpriseContainer/0.2-dev/car failed
>     [exec]
>     [exec]             Unknown start exception
>     [exec]
>     [exec]             Configuration
> org.xh.nuntius/EnterpriseContainer/0.2-dev/car failed
>     [exec]     to start due to the following reasons:
>     [exec]
>     [exec]       The service
>     [exec]
> EJBModule=NuntiusEJB.jar,J2EEApplication=org.xh.nuntius/EnterpriseContainer/0.2-dev/car,StatelessSessionBean=ExecutionLoggerImpl,j2eeType=WS
> Link,name=ExecutionLoggerImpl
>     [exec]     did not start because
>     [exec]     org.apache.axis2.receivers.RawXMLINOnlyMessageReceiver cannot be
>     [exec]     cast to org.apache.axis2.engine.MessageReceiver
> Not good...
> Hmmm...
> If I remove axis2-kernel dependency, application is deployed - which is weird.
> But when execution gets to:
> serviceClient.sendReceiveNonBlocking(OMXMLUtils.parseString(payload), callback);
> I get:
> LinkageError: loader constraint violation: when resolving method
> "org.apache.axis2.client.ServiceClient.sendReceiveNonBlocking(Lorg/apache/axiom/om/OMElement;Lorg/apache/axis2/client/async/AxisCallback;)V"
> the class loader (instance of
> org/apache/geronimo/kernel/classloader/JarFileClassLoader) of the
> current class, org/xh/nuntius/enterprise/broker/client/AsynchronousAxis2ServiceClient,
> and the class loader (instance of
> org/apache/geronimo/kernel/classloader/JarFileClassLoader) for
> resolved class, org/apache/axis2/client/ServiceClient, have different
> Class objects for the type org/apache/axiom/om/OMElement used in the
> signature
> I'm 100% confused.
> ServiceClient is defined in axis2-kernel. I cannot defined it
> explicitly because my @WebService will not be created.
> When I skip this dependency Geronimo somehow is adding it when doing
> @WebService stuff and there will be 2 different classes for
> org/apache/axiom/om/OMElement.
> Any ideas? Or maybe I should post this to Geronimo dev?
> best regards
> Łukasz
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