如何配置Apache CXF通过非Spring配置文件使用单个JAXBContext？

Question

I have read that sharing a single JAXBContext object across multiple threads can greatly reduce the CPU usage of an application that uses JAXB. A proof of this is here . We are currently using Apache CXF for developing web services. Apache CXF is bound to use JAXB by default.

• According to this , Apache CXF can be configured to use a single instance of JAXBContext through a configuration file.
• According to this , we can supply a configuration file to CXF. This configuration file is a Spring configuration file.
• According to this , Apache CXF can be used without Spring.

Given the above information, how do I configure Apache CXF to use a single JAXBContext without using a Spring based configuration file since I am looking at a code base that uses the servlet transport without Spring? Are there any other configuration parameters that can be added for the JAXBContext that will further improve the performance?

Answer 1

You could try the solution proposed here , based on the definition of a Global JAXBContext, but I'm not sure it will play well with jax-rs.

A simpler solution without spring would be to define your own @Provider , extending org.apache.cxf.jaxrs.provider.JAXBElementProvider , and register it in cxf, using the openejb-jar.xml file for instance, if you are working with tomee .

Your provider would look like:

@Provider
public class MyJAXBElementProvider<T> extends JAXBElementProvider<T> {
  public MyJAXBElementProvider() {
    super();
    setSingleJaxbContext(true);
    setExtraClass(...);
  }
}

and it would need to be registered in the WEB-INF/openejb-jar.xml file in your webapp like:

<?xml version="1.0"?>
<openejb-jar>
  <pojo-deployment class-name="jaxrs-application">
    <properties>
    cxf.jaxrs.providers = mypackage.MyJAXBElementProvider
    </properties>
  </pojo-deployment>
</openejb-jar>