<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="...1.0.0 namespace omitted to avoid spam message..."
  xmlns:xsi="...1.0.0 namespace omitted to avoid spam message..."
  xsi:schemaLocation="...1.0.0 namespace omitted to avoid spam message...
  ...1.0.0 namespace omitted to avoid spam message...">

    <bean id="referenceManager" class="com.acme.ReferenceManager">
        <property name="context" ref="blueprintBundleContext" />
        <property name="container" ref="blueprintContainer" />
    </bean>

    <reference id="acmeService" interface="com.acme.AcmeService" timeout="10000">
        <reference-listener ref="referenceManager" bind-method="bind" unbind-method="unbind" />
    </reference>
</blueprint>

public class ReferenceManager {

    private BundleContext ctx;
    private BlueprintContainer bc;

    public void setContext(BundleContext ctx) {
        this.ctx = ctx;
    }

    public void setContainer(BlueprintContainer bc) {
        this.bc = bc;
    }

    public void bind(ServiceReference ref) {
        System.out.println("<<< Binding service reference: " + ref + " >>>");
    }

    public void unbind(ServiceReference ref) {
        System.out.println("<<< Unbinding service reference: " + ref + " >>>");
    }
}

Bundle-Activator: org.eclipse.gemini.blueprint.extender.internal.boot.ChainActivator