因為我們使用了O-R映射注釋表示Message類的實例與數據庫表和列之間的映射關系（或者說是哪個域值能夠作為Message實例的主標識符），所以JPA依賴關系已經移入這個Java類中。這些映射信息可以移到一個單獨的orm.xml中，從而使這個類恢復Pure Old Java Object (POJO)狀態并完善這種不明確的更接近域對象模型的方法。
編碼前的測試
JUnit測試用例通過JNDI查找與服務進行交互并檢驗兩個服務方法返回的是否為預期的結果。
TestJPAService.java
01 package junit;
02
03 import java.util.Properties;
04
05 import javax.naming.Context;
06 import javax.naming.InitialContext;
07
08 import service.JPAService;
09 import service.Message;
10 import junit.framework.TestCase;
11
12 /**
13 * A JUnit test case to verify that a Session Bean is using the correct provider.
14 *
15 * The test must be invoked with two mandatory Java System Properties:
16 * <li>
jndi.name : the JNDI name of the registered Session Bean.
17 * <li>
persistence.provider: The
logical name of the
18 * persistence provider. Allowed values are
kodo or
hibernate.
19 *
20 * The optional Java System Properties are:
21 * <li>
weblogic.user : The authenticated user to contact Weblogic server. Defaults to
weblogic
22 * <li>
weblogic.password : The valid password to contact Weblogic server. Defaults to
weblogic
23 * <li>
weblogic.url : The URL where Weblogic Server is running. Defaults to
t3://localhost:7001
24 *
25 *
26 * @author ppoddar
27 *
28 */
29 public class TestJPAService extends TestCase {
30 private static final String USER = System.getProperty("weblogic.user"， "weblogic");
31 private static final String PWD = System.getProperty("weblogic.password"， "weblogic");
32 private static final String URL = System.getProperty("weblogic.url"， "t3://localhost:7001");
33 private static final String JNDI_NAME = System.getProperty("jndi.name");
34 private static final String PERSISTENCE_PROVIDER = System.getProperty("persistence.provider");
35
36 private static JPAService service;
37
38 /**
39 * Sets up the test by contacting Weblogic Server and looking up in JNDI
40 * for the registered Session Bean.
41 *
42 */
43 @Override
44 public void setUp() throws Exception {
45 assertNotNull("Must specify JVM System property -Djndi.name=<jndi> to run this test"， JNDI_NAME);
46 assertNotNull("Must specify JVM System property -Dpersistence.provider=[kodo|hibernate] to run this test"， PERSISTENCE_PROVIDER);
47 if (service == null) {
48 Properties p = new Properties();
49 p.put(Context.INITIAL_CONTEXT_FACTORY， "weblogic.jndi.WLInitialContextFactory");
50 p.put(Context.SECURITY_PRINCIPAL， USER);
51 p.put(Context.SECURITY_CREDENTIALS， PWD);
52 p.put(Context.PROVIDER_URL， URL);
53 System.out.println("Contacting server " + URL + " as " + USER + " for " + JNDI_NAME);
54 InitialContext ctx = new InitialContext(p);
55 service = (JPAService)ctx.lookup(JNDI_NAME);
56 }
57 }
58
59 /**
60 * Asserts that the Persistence Provider class name contains the
logical
61 * name of the intended provider i.e.
kodo or
hibernate.
62 *
63 */
64 public void testProvider() {
65 String actual = service.getProvider();
66 System.err.println("Logical Persistence Provider is [" + PERSISTENCE_PROVIDER + "]");
67 System.err.println("Actual Persistence Provider is [" + actual + "]");
68 assertTrue("*** ERROR: " + actual + " is not provided by " + PERSISTENCE_PROVIDER， actual.indexOf(PERSISTENCE_PROVIDER) != -1);
69 }
70
71 /**
72 * Simply logs (persists) a message via the remote service.
73 * The service will affix a timestamp with the persisted message it returns.
74 * Verifies that the timestamp against the time when the message has been
75 * sent.
76 *
77 */
78 public void testLog() {
79 long senderTime = System.currentTimeMillis();
80 String body = "A message sent for logging on " + senderTime;
81 Message message = service.log(body);
82 long createTime = message.getTimestamp().getTime();
83 long elapsedTime = createTime - senderTime;
84 System.err.println("Persisted Message [id:" + message.getId() + " timestamp:" +
85 message.getTimestamp().getTime() + " body:"+ message.getBody() + "]");
86 System.err.println("Time elapsed between the message to send and persisted is " + elapsedTime + "ms");
87 assertTrue(elapsedTime>=0);
88 }
89 }
