@BeforeClass method responsible for creating jndi datasource for oracle

junit_snippet_jndi.java

        @BeforeClass
	public static void setUpClass() throws Exception {
		try {
			System.setProperty(Context.INITIAL_CONTEXT_FACTORY,
					"org.apache.naming.java.javaURLContextFactory");
			System.setProperty(Context.URL_PKG_PREFIXES, "org.apache.naming");
			InitialContext ic = new InitialContext();
			ic.createSubcontext("jdbc");
			// Construct DataSource
			OracleConnectionPoolDataSource ds = new OracleConnectionPoolDataSource();
			ds.setURL(DB_URL);
			ds.setUser(DB_USERNAME);
			ds.setPassword(DB_PASSWORD);

			ic.bind(DATASOURCE_JNDI_NAME, ds);
			
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}