/**
* Demonstrates how a Lazy Load exception can occur when processing objects from server that have
* not been hydrated.
*
* @throws Exception
*/
@Test
public void testLazy() throws Exception {
log.info("*** testLazy ***");
Owner owner = teller.createOwner("joe", "jones", "123");
owner = teller.openAccount(owner.getId(), "111");
Owner owner2 = teller.createOwner("jane", "jones", "333");
owner2 = teller.addOwner(owner2.getId(), "111");
// get a set of owners that have been lazily loaded
List<Owner> owners = teller.getOwners(0, 100);
assertEquals("unexpected number of owners", 2, owners.size());
try {
for (Owner o : owners) {
for (Account a : o.getAccounts()) {
log.info("account=" + a);
}
}
fail("did not encounter expected exception");
} catch (LazyInitializationException expected) {
log.info("encountered expected exception:" + expected);
}
// now get them fully loaded
owners = teller.getOwnersLoaded(0, 100);
for (Owner o : owners) {
for (Account a : o.getAccounts()) {
log.info("account=" + a);
}
}
}
/**
* Demonstrates a fix for the LAZY Load issue but then shows how persistence classes from the
* server are being leaked into the client.
*
* @throws Exception
*/
@Test
public void testPOJO() throws Exception {
log.info("*** testPOJO ***");
Owner owner = teller.createOwner("joe", "jones", "123");
owner = teller.openAccount(owner.getId(), "111");
Owner owner2 = teller.createOwner("jane", "jones", "333");
owner2 = teller.addOwner(owner2.getId(), "111");
// now get the objects fully loaded
List<Owner> owners = teller.getOwnersLoaded(0, 100);
for (Owner o : owners) {
for (Account a : o.getAccounts()) {
log.info("account=" + a);
}
log.debug("addresses=" + o.getAccounts().getClass().getName());
assertTrue(
"unexpected collection class",
o.getAccounts().getClass().getName().contains("hibernate"));
}
// now get the objects cleaned of persistence classes
owners = teller.getOwnersPOJO(0, 100);
for (Owner o : owners) {
for (Account a : o.getAccounts()) {
log.info("account=" + a);
}
log.debug("addresses=" + o.getAccounts().getClass().getName());
assertFalse(
"unexpected collection class",
o.getAccounts().getClass().getName().contains("hibernate"));
}
}
/**
* Demonstrates a fix of the LAZY Load and class leakage problem by using DTOs.
*
* @throws Exception
*/
@Test
public void testDTO() throws Exception {
log.info("*** testDTO ***");
int startCount = teller.getOwnersDTO(0, 100).size();
Owner owner = teller.createOwner("joe", "jones", "123");
owner = teller.openAccount(owner.getId(), "111");
Owner owner2 = teller.createOwner("jane", "jones", "333");
owner2 = teller.addOwner(owner2.getId(), "111");
// get DTOs instead
List<OwnerDTO> owners = teller.getOwnersDTO(0, 100);
for (OwnerDTO o : owners) {
log.debug("ownerDTO=" + o);
}
assertEquals("unexpected number of owners", startCount + 2, owners.size());
}