AsWar.md

Overview

---

Example WAR

• The following explanation is based on the existing example project, that can be take from the Maven repository as org.apache.olingo.jpa.examples:olingo-generic-servlet-example

1. Define WAR module

• Create a Maven module with packaging war.
• Add the dependencies as listed in Dependency handling

2. Define servlet

• For details look into org.apache.olingo.jpa.servlet.example.ODataServlet The template for an standalone servlet managing OData/REST requests can be used as:

@WebServlet(name = "odata-servlet", loadOnStartup = 1, urlPatterns = { "/odata/*" })
@ServletSecurity(httpMethodConstraints = { @HttpMethodConstraint(value = "GET", rolesAllowed = { "Reader" }),
		@HttpMethodConstraint(value = "POST", rolesAllowed = { "Writer" }) })
public class ODataServlet extends HttpServlet {
	@Override
	protected void service(final HttpServletRequest req, final HttpServletResponse resp)
			throws ServletException, IOException {
		try {
			JPAODataServletHandler requestHandler = createHandler();
			requestHandler.process(req, resp);
		} catch (final RuntimeException | ODataException e) {
			throw new ServletException(e);
		}

	}

	private JPAODataServletHandler createHandler() throws ODataException {
		final Map<Object, Object> elProperties = new HashMap<>();
		elProperties.put("javax.persistence.nonJtaDataSource", JNDI_DATASOURCE);
		JPAAdapter mappingAdapter = new ResourceLocalPersistenceAdapter(Constant.PUNIT_NAME,	elProperties, new JPA_DefaultDatabaseProcessor());
		return new JPAODataServletHandler(mappingAdapter);
	}

}

The example uses container managed security. To realize a more detailed control over security you should read Servlet security.