Guice instantiates it, in the GuiceContextListener you can see the 'new
ServletModule()'
The ServletModule looks like this:
public class ServletModule extends com.google.inject.servlet.ServletModule {
private static final String JERSEY_SCAN_PACKAGE =
"eu.vranckaert.worktime.json.endpoint.impl";
private static final String JERSEY_POJO_MAPPING_FEATURE = "true";
@Override
protected void configureServlets() {
/*
* The following line will scan our package for Jersey Resources
*/
final Map<String, String> params = new HashMap<String, String>();
params.put("com.sun.jersey.config.property.packages",
JERSEY_SCAN_PACKAGE);
params.put("com.sun.jersey.api.json.POJOMappingFeature",
JERSEY_POJO_MAPPING_FEATURE);
filter("/*").through(PersistFilter.class);
serve("/rest/*").with(GuiceContainer.class, params);
}
}
In here I have the PersistFilter also for the session-per-http-request as
explained in the docs (at the
bottom): https://code.google.com/p/google-guice/wiki/JPA
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
xmlns="http://java.sun.com/xml/ns/persistence";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd";>
<persistence-unit name="myDB" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="hibernate.connection.driver_class"
value="com.mysql.jdbc.Driver"/>
<property name="hibernate.connection.url"
value="jdbc:mysql://localhost:3306/WorkTime"/>
<property name="hibernate.connection.username" value="root"/>
<property name="hibernate.connection.password" value=""/>
<property name="hibernate.dialect"
value="org.hibernate.dialect.MySQLDialect"/>
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.archive.autodetection" value="class"/>
<property name="hibernate.id.new_generator_mappings"
value="true"/>
</properties>
</persistence-unit>
</persistence>
Remark the the transaction type that is set to RESOURCE_LOCAL. I also tried
removing the transaction type. According to the docs I understand that if I
set the transaction type to RESOURCE_LOCAL that I would have a session per
transaction...
Kr
Dirk
Op vrijdag 18 oktober 2013 11:27:40 UTC+2 schreef Thomas Broyer:
>
> Who's responsible for instantiating the TestEndpoint class? Is it really
> instantiated by Guice or is Guice only injecting its members (in which case
> AOP won't work) ?
>
> On Friday, October 18, 2013 11:06:53 AM UTC+2, Dirk Vranckaert wrote:
>>
>> I'm building a backend application for one of my Android applications.
>> My setup is Hibernate as ORM, MySQL as DB, Guice as DI and Guice-Persist
>> for the link between ORM and DI.
>>
>> My webservice-endpoint class looks like this:
>>
>> @Path("test")
>> public class TestEndpoint {
>> @Inject
>> private UserDao userDao;
>>
>> @GET
>> @Path("persistUser")
>> @Produces(MediaType.TEXT_PLAIN)
>> @Transactional
>> public String persistUser() {
>> User user = new User();
>> user.setEmail("[email protected]");
>> user.setFirstName("FirstName");
>> user.setLastName("LastName");
>> user = userDao.persist(user);
>> return "ok";
>> }
>> }
>>
>> When I manually manage the transaction it works and my entity is
>> persisted:
>>
>> @Path("test")
>> public class TestEndpoint {
>> @Inject
>> private UserDao userDao;
>>
>> @Inject
>> private Provider<EntityManager> em;
>>
>> @GET
>> @Path("persistUser")
>> @Produces(MediaType.TEXT_PLAIN)
>> public String persistUser() {
>>
>> ((HibernateEntityManager)em.get()).getSession().getTransaction().begin();
>>
>> User user = new User();
>> user.setEmail("[email protected]");
>> user.setFirstName("FirstName");
>> user.setLastName("LastName");
>> user = userDao.persist(user);
>>
>>
>> ((HibernateEntityManager)em.get()).getSession().getTransaction().commit();
>>
>> return "ok";
>> }
>> }
>>
>> My UseDaoImpl that is injected via UserDao looks like this:
>>
>> public abstract class UserDaoImpl {
>> @Inject
>> private Provider<EntityManager> em;
>>
>> public EntityManager getEntityManager() {
>> return em.get();
>> }
>> public User persist(User instance) {
>> getEntityManager().persist(instance);
>> return instance;
>> }
>>
>> public User findById(String id) {
>> return getEntityManager().find(User.class, id);
>> }
>> }
>>
>> My GuiceContextListener looks like this:
>> public class GuiceContextListener extends GuiceServletContextListener {
>> @Override
>> protected Injector getInjector() {
>> Injector injector = Guice.createInjector(
>> new DatabaseModule(),
>> new GuiceDaoModule(),
>> new GuiceServiceModule(),
>> new ServletModule()
>> );
>> return injector;
>> }
>> }
>>
>> The DatabaseModule:
>> public class DatabaseModule extends AbstractModule {
>> private static final String JPA_UNIT = "myDB";
>>
>> @Override
>> protected void configure() {
>> install(new JpaPersistModule(JPA_UNIT));
>> }
>> }
>>
>> The GuiceDaoModule:
>> public class GuiceDaoModule implements Module {
>> @Override
>> public void configure(Binder binder) {
>> binder.bind(UserDao.class).to(UserDaoImpl.class);
>> }
>> }
>>
>> And this is my web.xml configuration:
>> <?xml version="1.0" encoding="ISO-8859-1"?>
>> <web-app xmlns="http://java.sun.com/xml/ns/javaee";
>> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
>> xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
>> http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd";
>> version="2.5">
>> <display-name>MyApp</display-name>
>>
>> <listener>
>>
>> <listener-class>eu.vranckaert.test.guice.GuiceContextListener</listener-class>
>> </listener>
>>
>> <!-- GUICE -->
>> <filter>
>> <filter-name>guiceFilter</filter-name>
>> <filter-class>com.google.inject.servlet.GuiceFilter</filter-class>
>> </filter>
>>
>> <filter-mapping>
>> <filter-name>guiceFilter</filter-name>
>> <url-pattern>/*</url-pattern>
>> </filter-mapping>
>> </web-app>
>>
>>
>> When I do findById(..) I can also retrieve my record, so my DB connection
>> is working, I'm just not able to use the @Transactional annotation...
>> So I found something about wrong scope of my EntityManager, but I have no
>> clue how I can change the entity manager's scope...
>>
>> You guys have any idea what is wrong with my setup that the annotation
>> does not work?
>>
>> Dirk
>>
>
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