Update: A full JNDI lookup is working, but why do I not get a reference using the annotations?
If I have SomeBean -->Bean Implementation SomeRef --> Remote Interface SomeRefLocal --> Local Interface then @EJB SomeRef ref; should work to get the remote interface, right? -Steffen- On 25 Mrz., 21:39, [email protected] wrote: > Hi Gregor, > > thanks for this extensive answer. I deployed a very simple sample > application to JBoss but for any reason I cannot access myEJBfrom my > RPC service. Neither with the @EJBannotation nor with the @Resource > SessionContext ctx statement. That's what my service implementation > looks like: > > package de.stsch.j2ee.gwt.server; > > import javax.annotation.Resource; > import javax.ejb.EJB; > import javax.ejb.SessionContext; > > import com.google.gwt.user.server.rpc.RemoteServiceServlet; > > import de.stsch.j2ee.ejb.StSch; > import de.stsch.j2ee.gwt.client.GwtClientSrc; > > public class GwtClientSrcImpl extends RemoteServiceServlet implements > GwtClientSrc { > @EJB > StSch bean; > > @Resource > SessionContext ctx; > > @Override > public String getName() { > StringBuffer sb = new StringBuffer(); > if (ctx == null) { > sb.append("ctx is null"); > } else { > sb.append("ctx is not null"); > } > > if (bean == null) { > sb.append(", bean is null"); > } else { > sb.append(", bean is not null"); > } > return sb.toString(); > } > > } > > And it always returns that both ctx and bean is null :-( > > Any idea why? > > -Steffen- > > On 25 Mrz., 16:26, gregor <[email protected]> wrote: > > > Hi Steffen, > > > The simplest way to do this is to add your GWT app as a module (WAR) > > to your EAR. The GWT RPC servlets will then have direct access to your > > session beans local interfaces (which you must define BTW). > > > If you cannot do this for some reason, the situation is a bit > > trickier. Your standalone Java client probably uses RMI to call your > > session beans? Is so, then it is calling the beans remote interfaces > > and call parameters/return values are serialized over the wire. AFAIK > > you cannot call the local interface of a session bean from a class > > outside its EAR. You can always use JNDI to look up the remote > > interfaces of your session beans from a separate GWT module's RPC > > servlets (which mimics what happens with the Java client) but this > > involves your app server serializing and deserializing all objects > > passed betweeen the GWT app and the enterprise app, i.e. the app > > server will be serializing to itself, which is a serious performance > > drain you will want to avoid. > > > BTW I think the reason why this is so is that each EAR or WAR deployed > > on your app server is allocated it's own classloader, so in this > > situation your session beans are not directly visible by reference to > > your GWT module classes and visa versa, so they must be called > > remotely (which means serialization). > > > One way around this is to set up yourEJBapplication as a Resource > > Adapter ARchive (RAR). This is not normally used in applications as > > such, and is usually associated with some external data source common > > to a number of applications in an enterprise situation (a bit like a > > database, it's comparable to a JDBC). Normally vendors use it, for > > example Apache Jackrabbit uses a RAR. However this complicates things, > > and I am not sure you will get optimal performance out of it anyway > > (although I am not sure, I use RAR's but have never written one > > myself), but it will probably perform better than using remote > > interfaces to your session beans. > > >http://publib.boulder.ibm.com/infocenter/wasinfo/v6r0/index.jsp?topic... > > > For these reasons, unless you have the strongest possible reasons for > > not doing so, I think your best bet is to include your GWT module in > > your main enterpise application (so it is a WAR inside the EAR) and > > then you will be able to call your session beans directly from GWT RPC > > servlets using their local interfaces. This should give you the best > > performance from the simplest code. > > > regards > > gregor > > > On Mar 25, 2:15 pm, stsch <[email protected]> wrote: > > > > In Eclipse I have one project (j2eeEjb) containing the Enterprise Java > > > Beans, one projects (j2eeClient) contains the corresponding Remote > > > Interfaces and one project (j2eeEar) only assembles everything into an > > > ear-file. The resulting ear-file contains 2 jar-files, j2eeEjb.jar and > > > j2eeClient.jar; this is the corresponding application.xml of the ear- > > > file > > > > <?xml version="1.0" encoding="ASCII"?> > > > <application xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; > > > xmlns="http://java.sun.com/xml/ns/javaee"; xmlns:application="http:// > > > java.sun.com/xml/ns/javaee/application_5.xsd" > > > xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/ap..."; > > > version="5"> > > > <display-name>j2eeEAR</display-name> > > > <module> > > > <ejb>j2eeEjb.jar</ejb> > > > </module> > > > </application> > > > > and this is the correspondingejb-jar.xml of the j2eeEjb.jar > > > > <?xml version="1.0" encoding="UTF-8"?> > > > <ejb-jar > > > xmlns="http://java.sun.com/xml/ns/javaee"; > > > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; > > > xmlns:ejb="http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd"; > > > > > > xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/ej..."; > > > version="3.0"> > > > <display-name>j2ee</display-name> > > > <enterprise-beans> > > > <session> > > > <ejb-name>StSchBean</ejb-name> > > > </session> > > > </enterprise-beans> > > > <ejb-client-jar>j2eeClient.jar</ejb-client-jar> > > > </ejb-jar> > > > > I can call a stateless session bean from a stadalone Java client > > > without any problems. > > > > To the experts: Does this structure make sense? Or any suggestions for > > > improvement? > > > > To develop a GWT application I would create a new project in eclipse > > > and deploy it to my application server as a separate war-file. Does > > > that make sense? Or should I try to include it into the ear-file > > > extending the application.xml by a web module-entry? > > > > Nevertheless I couldn't make a call from my GWT RPC service to my > > > session bean. What would be the best approach to do so? In my opinion > > > there are 2 options: use the @EJBannotation or use > > > > @Resource > > > SessionContext ctx; > > > > and do a lookup. Or is there any other option? > > > > Thanks in advance for any help, I really feel a bit stuck now :-( > > > > -Steffen_ --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. 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