private static Node node;
@BeforeClass
public static void setUpBeforeClass() throws Exception {
System.setProperty("org.apache.tuscany.sca.contribution.processor.ValidationSchemaExtensionPoint.enabled", "false");
NodeFactory factory = NodeFactory.newInstance();
node = factory.createNode(
new Contribution("iface", getJar("../helloworld-iface/target")),
new Contribution("service", getJar("../helloworld-service/target")),
new Contribution("client", getJar("../helloworld-client/target")));
node.start();
}