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CXF uses Java SE Logging for both client- and server-side logging of SOAP requests and responses. Logging is activated by use of separate in/out interceptors that can be attached to the client and/or service as required. These interceptors can be specified either programmatically (via Java code and/or annotations) or via use of configuration files.

Configuration files are probably best. They offer two benefits over programmatic configuration:

1. Logging requirements can be altered without needing to recompile the code
2. No Apache CXF-specific APIs need to be added to your code, which helps it remain interoperable with other JAX-WS compliant web service stacks

Enabling message logging through configuration files is shown here.

For programmatic configuration, the logging interceptors can be added to your service endpoint as follows:

import javax.xml.ws.Endpoint;
import org.apache.cxf.interceptor.LoggingInInterceptor;
import org.apache.cxf.interceptor.LoggingOutInterceptor;
import org.apache.cxf.jaxws.EndpointImpl;

.......

Object implementor = new GreeterImpl();
EndpointImpl ep = (EndpointImpl) Endpoint.publish("http://localhost/service", implementor);

ep.getServer().getEndpoint().getInInterceptors().add(new LoggingInInterceptor());
ep.getServer().getEndpoint().getOutInterceptors().add(new LoggingOutInterceptor());

For web services running on CXFServlet, the below annotations can be used on either the SEI or the SEI implementation class. If placed on the SEI, they activate logging both for client and server; if on the SEI implementation class, they are relevant just for server-side logging.

import org.apache.cxf.feature.Features;

@javax.jws.WebService(portName = "MyWebServicePort", serviceName = "MyWebService", ...)
@Features(features = "org.apache.cxf.feature.LoggingFeature")        
public class MyWebServicePortTypeImpl implements MyWebServicePortType {

or (equivalent)

import org.apache.cxf.interceptor.InInterceptors;
import org.apache.cxf.interceptor.OutInterceptors;

@javax.jws.WebService(portName = "WebServicePort", serviceName = "WebServiceService", ...)
@InInterceptors(interceptors = "org.apache.cxf.interceptor.LoggingInInterceptor")
@OutInterceptors(interceptors = "org.apache.cxf.interceptor.LoggingOutInterceptor")
public class WebServicePortTypeImpl implements WebServicePortType {

For programmatic client-side logging, the following code snippet can be used as an example:

import org.apache.cxf.endpoint.Client;
import org.apache.cxf.frontend.ClientProxy;
import org.apache.cxf.interceptor.LoggingInInterceptor;
import org.apache.cxf.interceptor.LoggingOutInterceptor;

public class WSClient {
    public static void main (String[] args) {
        MyService ws = new MyService();
        MyPortType port = ws.getPort();
        
        Client client = ClientProxy.getClient(port);
        client.getInInterceptors().add(new LoggingInInterceptor());
        client.getOutInterceptors().add(new LoggingOutInterceptor()); 
        
        // make WS calls...

However, you will probably want to use configuration files for this. They offer two benefits over programmatic configuration:

1. Logging requirements can be altered without needing to recompile the code
2. No Apache CXF-specific APIs need to be added to your code, which helps it remain interoperable with other JAX-WS compliant web service stacks.

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Configure logging levels.

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