Linkage Error while Consuming apache-cxf Web Services in Liferay 7

Question

I am trying to consume apache-cxf Web Services In Liferay-7 portlet ,I got the following error in linux environment.

13:39:14,374 ERROR [http-nio-4080-exec-9][status_jsp:950] com.liferay.portal.kernel.portlet.PortletContainerException: com.liferay.portal.kernel.portlet.PortletContainerException: javax.servlet.ServletException: java.lang.LinkageError: com/sun/org/apache/xpath/internal/jaxp/XPathImpl

If I run the same portlet in liferay 7 windows environment it is working fine

And here is the sample jsp code (view.jsp)

<portlet:defineObjects />
<%@ page import="org.apache.cxf.endpoint.Client" %>
<%@ page import="org.apache.cxf.jaxws.endpoint.dynamic.JaxWsDynamicClientFactory" %>
<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
<%

String endpoint="http://*******/***-ws/soap/login?wsdl";
String method ="login";
String uname ="admin";
String pwd = "admin";
String result = "";

Object[] params = new Object[2] ;
params[0] = (Object)uname;
params[1] = (Object)pwd;

result = call(endpoint, method, params);
System.out.println("Result : "+result);
%>
<%!

public static  String call(String endpoint, String method, Object[] params) {

JaxWsDynamicClientFactory dcf = JaxWsDynamicClientFactory.newInstance();

try {
    Client client = dcf.createClient(endpoint);
    System.out.println("Client Object Create successfully  :");
    Object[]  returnVals = client.invoke(method, params);
    //extract returned value. getting 1st value as sakai ws calls returns only one value.
    if(returnVals!=null && returnVals.length>0)
        return (String)returnVals[0];
}
catch (Exception e) {
    e.printStackTrace();
    System.out.println("A connection error occurred: " + e.getClass() + ": " + e.getMessage());
}
return null;
}
%>

The Problem is occurring at Client client = dcf.createClient(endpoint);

Here is the dependencies we are using

==============================

cxf-core-3.1.8.jar

cxf-rt-bindings-soap-3.1.8.jar

cxf-rt-databinding-jaxb-3.1.8.jar

cxf-rt-frontend-jaxws-3.1.8.jar

cxf-rt-frontend-simple-3.1.8.jar

cxf-rt-transports-http-3.1.8.jar

cxf-rt-wsdl-3.1.8.jar

neethi-3.0.3.jar

==============================

Same Code I have checked in Liferay 6.2 and its working fine in both windows and linux environment, but I have added some more jar files.

==============================

cxf-rt-bindings-xml-3.1.8.jar

cxf-rt-ws-addr-3.1.8.jar

cxf-rt-ws-policy-3.1.8.jar

jaxb-impl-2.2.11.jar

jaxb-core-2.2.11.jar

xmlschema-core-2.2.1.jar

stax2-api-3.1.4.jar

woodstox-core-asl-4.4.1.jar

wsdl4j-1.6.3.jar

==============================

Please Help me out .

Thanks & Regards,

P.V.B.Raju.

How do you package your app? Do you use WARs? OSGi Bundles? Fat OSGi jars? — Miroslav Ligas
Linux and windows load the lib in different order maybe there is a required sequence in which the libraries need to be loaded to make it work. This could be caused by having too many implementations on the classpath and things get overridden. Also, I would consider the OSGi approach in developing plugins. — Miroslav Ligas
could you paste the Gradle/maven file in here with the dep definitions? — Miroslav Ligas

Miroslav Ligas Miroslav Ligas · Accepted Answer · 2017-11-12T17:27:59

I tried the war approach and it worked fine. I tested in on Liferay 7 DXP FP 32.

See my test code. https://github.com/mir333/cxf-test-demo

The jar approach is a bit more tricky because you need to list all necessary libraries in Gradle and bnd file. Basically, everything that is in the war files lib folder would need to be inserted there and if you get still a missing import message you need to find a lib that provides the package and add it as well.

Have a look at this blog post it explains how to do it and it refers to another blog post have a look at it also. https://web.liferay.com/web/sushil.patidar/blog/-/blogs/liferay-osgi-module-project-dependency-resolution

EDIT: New tooling becomes available for this. Have a look at https://dev.liferay.com/develop/tutorials/-/knowledge_base/7-0/adding-third-party-libraries-to-a-module#embedding-libraries-using-gradle make sure you are on the right Gradle plugin.

Linkage Error while Consuming apache-cxf Web Services in Liferay 7

2 Answers