[EJB3] - Cant inject Bean class into Restfull WebService (JAX-RS)
by ha so
ha so [https://community.jboss.org/people/haso] created the discussion
"Cant inject Bean class into Restfull WebService (JAX-RS)"
To view the discussion, visit: https://community.jboss.org/message/821240#821240
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I'm trying to save data acquired by Rest web service to database using hibernate/persistence.
In one of my web modules i implemented that service. Database ejb connector is placed in EJB module. They are parts of EAR application.
Every time when i call pb.addDevice() im getting java.lang.NullPointerException when puting proper url with params in browser(worked till i wanted to save it to Database). Can't find what is wrong with it. I'm using jboss 6.1.0 Final.
PS. when i changed from
@EJB
PersistenceBean pb;
to
PersistenceBean pb = new PersistenceBean();
i got null pointer on EntityManager em = emf.createEntityManager();
code:
@Stateless
@Path("/RestService")
public class RestPush {
@EJB
PersistenceBean pb;
@GET
@Path("/RegisterDevice")
public void registerDevice(
@QueryParam("deviceId") String deviceId){
Device d = new Device(true);
d.setId = deviceId;
pb.addDevice(d);
}
}
and EJB class:
@Stateless(mappedName = "PersistenceBean")
public class PersistenceBean {
@PersistenceUnit(unitName = "PersistentUnitName")
EntityManagerFactory emf;
private void persist(Object o, EntityManager entityManager) {
try {
entityManager.persist(o);
} catch (Exception e) {
logger.severe("Error writing to DB: " + e);
logger.severe("" + e.fillInStackTrace());
}
}
public void addDevice(Device d) {
try {
EntityManager em = emf.createEntityManager();
if (persist(device, em)) {
logger.info("Device with id : " + device.getId()
+ " has been added ");
} else {
logger.info("Failed to add device with id: " + device.getId());
} catch (Exception e) {
logger.severe("PersistenceBean: Could not save device.");
e.printStackTrace();
}
}
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12 years, 10 months
[IronJacamar] - Is this the right project for a simple socket usecase?
by kaffeetrinker
kaffeetrinker [https://community.jboss.org/people/kaffeetrinker] created the discussion
"Is this the right project for a simple socket usecase?"
To view the discussion, visit: https://community.jboss.org/message/821211#821211
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Hi there,
i stumbled over iron jacamar while searching for jca, but I'm not very familiar with jcaeither. I have a simple usecase:
The j2ee web project I'm working on needs to connect to a tcp socket, send/receive data and then close it. I could have done this within a singleton bean, but because I have to watch the socket inputstream, I have the need to create a thread for that. That said, I think it is not allowed to create threads within a j2ee container on my own. I also tried to use @Asynchronous for the socket function, but that resulted in multiple concurrence exceptions.
Now that i've read a little bit about jca and iron jacamar, I think maybe this is the right way to implement the socket connection. But for example, I could not find a sample with a while loop over the socket, that would notify my web project in case of an event.
Could you give me some hints what to use? So far I thought of creating an outbound jca (with the help of the eclipse plugin) and send event notifications to the web app via jms queue (because I could not find a sample of how to notify the resource client in case of an event).
Thank you!
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Start a new discussion in IronJacamar at Community
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12 years, 10 months