This bean will allow cxf:proxy-clients to use the same outInterceptor. Useful when multiple clients need to use the same request auth.

com.example.PasswordCallback.java

public class PasswordCallback implements CallbackHandler {
  private Map<String, String> passwords;
  
  public PasswordCallback(String username, String password) {
    password.put(username, password);  
  }
  
  public void handle(Callback[] callbacks) throws IOException, UnsupportedCallBackException {
    for (int = 0; i < callbacks.length; i++) {
      WSPasswordCallback pc = (WSPasswordCallback) callbacks[i];
      pc.setPassword(passwords.get(pc.getIdentifier()));
    }
  }
}

mule-springWSRequestInterceptor.xml

<spring:bean id="reqInterceptor" name="reqInterceptor" class="org.apache.cxf.ws.secuirty.wss4j.WSS4JOutInterceptor">
  <spring:constructor-arg>
    <spring:map>
      <spring:entry key="action" value="UsernameToke"/>
      <spring:entry key="passwordType" value="PasswordText"/>
      <spring:entry key="user" value="${server.username}"/>
      <spring:entry key="passwordCallbackRef">
        <spring:bean class="com.example.PasswordCallBack">
          <spring:constructor-arg value="${server.username}"/>
          <spring:constructor-arg value="${server.password}"/>
        </spring:bean>
      </spring:entry>
    </spring:map>
  </spring:constructor-arg>
</spring:bean>