I am new to EJB3 and am missing something when it comes to accessing a #Remote #Stateless bean deployed as an ejb module inside an ear file. I want to access a remote bean in lima.ear from soup.ear.
Here is what I am doing now (somewhat abbreviated):
//deployed under lima.ear
#Remote
#Stateless
public interface LimaBean {
String sayName();
}
I want to put LimaBean in the Soup:
//deployed in soup.ear
#Stateless
public class Soup implements SoupLocal {
#EJB
private LimaBean limaBean;
public String taste() {
return limaBean.sayName();
}
}
When I start JBoss I get the following error:
java.lang.RuntimeException: could not resolve global JNDI name for #EJB for container Soup: reference class: com.example.LimaBean ejbLink: not used by any EJBs
I have had a hard time finding out what this ejbLink is about, if that is the right path to go down.
If I deploy LimaBean as a jar file in jboss then everything works great!
I ran accross an article that had a section called "2.5.3. References between beans in different jars and different ears"
(http://jonas.ow2.org/doc/howto/jboss2_4-to-jonas3_0/html/x111.html)
Example of jboss.xml file for SB_BrowseRegions:
<jboss>
<session>
<ejb-name>SB_BrowseRegions</ejb-name>
<ejb-ref>
<ejb-ref-name>ejb/Region</ejb-ref-name>
<jndi-name>protocol://serverName/directory/RegionHome</jndi-name>
</ejb-ref>
</session>
</jboss>
If I touch the soup.ear, after JBoss starts up then it deploys fine, so I am assuming I need to specify a dependency like the above article says.
But even after it deploys then I get an error when accessing the remote LimaBean:
Caused by: java.lang.IllegalArgumentException: Can not set com.soup.LimaBean field com.soup.Soup.limaBean to $Proxy147
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:146)
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:150)
at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63)
at java.lang.reflect.Field.set(Field.java:657)
at org.jboss.injection.JndiFieldInjector.inject(JndiFieldInjector.java:115)
... 49 more
I have tried a few things but, if anyone can point me in the right direction about this I would appreciate it.
It looks like the JNDI properties need to be set as if it were a remote client outside of the app server because of the ear isolation we have setup.
properties.put(Context.PROVIDER_URL, url);
InitialContext ctx = new InitialContext(properties);
Just specify the URL for the InitialContext and that should do the trick.
Related
Java EE Tutorial is not helpful at all. Internet search was underwhelming.
I have an EJB module that is deployed to glassfish by itself. It has #Local and #Remote annotated iterfaces which are both implemented by the concrete class.
Then i have a REST resource that needs to get a reference to that ejb module and invoke some methods.
Can you give me a barebones, simple example of how that is done? I mean, i can't even inject SessionContext into my rest app, as it crashes... Please, keep it simple.
The ejb should just have a:
public String getMsg(){
return "ohai";
}
The rest service:
#GET
#Produces("text/plain")
public String asd(){
return <the myterious ejb that was injected somehow>.getMsg();
}
Thanks.
Alright, i figured it out. Using NetBeans, but probably applicable to Eclipse. Server - glassfish
Create webapp, an EJB -> call EJB from webapp. All these run inside the same server as separate modules.
First: create an EJB module, it will be deployed on its own:
remote interface:
package main;
import javax.ejb.Remote;
#Remote
public interface YourRemoteInterface{
public String tellMeSomething();
public void otherMethod(); //etc...
}
then create the EJB implementation class:
concrete implementation
package main;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.ejb.EJB; //crucial to JNDI lookup
#Remote(RemoteInterface.class)
#Stateless
#EJB(name="java:global:/MYSTUFF", beanInterface=YourRemoteInterface.class)
public class YourConcreteClass implements YourRemoteInterface{
#Override
public String tellMeSomething(){//...} //and do the other methods
}
#EJB name attribute names your bean, that you will use to look it up. Can by any name. For ex: "some-name", or "java:global/YourConcreteClass"
Part two - webapp:
For web app i used a rest service, but surely can be another EJB or a SE client app. For SE client you'd need to set connection info, but that for another life.
#Path("/somePath")
public class Service{
#GET
#Produces("text/plain")
public String qwe(){
try{
javax.naming.InitialCOntext ic = new javax.naming.InitialContext();
YourRemoteInterface rb = (YourRemoteInterface)ic.lookup("java:global:/MYSTUFF");
return rb.tellMeSomething();
} catch (Exception ex) {
return "F*uck your life";
}
}
}
Now, from Project Properties of your webapp, you need to:
1) add the ejb jar file to Libraries so it shows in the Compile tab. I used the "Add project" button
2) Build -> Packaging: add the ejb jar file to WAR content. I used "Add file/folder", where i navigated to NetBeans projects / the EJB module / build / dist
note: you may experience an error when trying to deploy the ejb, or redeploy it. Error name is: java.lang.RuntimeException: Error while binding JNDI name main.RemoteInterface#main.RemoteInterface for EJB RemoteBean . Skipping the vague explanation, to cure it, you need to execute a command in glassfish:
asadmin set server.ejb-container.property.disable-nonportable-jndi-names="true"
Now, you can compile the webapp and deploy it. Should work.
At the end it's that simple. I swear i've eaten the WHOLE ejb section in glassfish tutorial and nowhere do they tell you this stuff. It's so annoying.
I try to build a Java EE 7 app with Rest services and EJB injection.
I created a multi module maven project which I deploy on Glassfish 4. My final EAR contain a JAR with my EJBs, with for example my Rest services definitions :
#Stateless
#Path("countries")
public class CountryRest {
//#EJB
//StockService stockService;
#GET
public Response getCountries() {
//stockService.getAll(); --> firing a NPE, stockService is Null
return Response.ok().build();
}
}
#Stateless
#Remote(IStockService.class)
public class StockService implements IStockService {
#Override
public List<Stock> getAllStock() {
return new ArrayList<Stock>();
}
}
When I deploy my app, I see the following logs which seems ok. Even if I wonder why it defines "java:global" JNDI since by default #Stateless EJB is #Local :
Portable JNDI names for EJB CountryRest: [java:global/GeoData-ear/GeoData-ejb-1.0-SNAPSHOT/CountryRest, java:global/GeoData-ear/GeoData-ejb-1.0-SNAPSHOT/CountryRest!com.tomahim.geodata.rest.CountryRest]
Portable JNDI names for EJB StockService: [java:global/GeoData-ear/GeoData-ejb-1.0-SNAPSHOT/StockService, java:global/GeoData-ear/GeoData-ejb-1.0-SNAPSHOT/StockService!com.tomahim.geodata.services.IStockService]
Then when I'm doing a GET on /rest/countries, the status is 200 as expected but I have a NameNotFoundException / NamingException :
Avertissement: An instance of EJB class, com.tomahim.geodata.rest.CountryRest, could not be looked up using simple form name. Attempting to look up using the fully-qualified form name.
javax.naming.NamingException: Lookup failed for 'java:module/CountryRest' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NameNotFoundException: No object bound to name java:module/CountryRest]
I see that the lookup for "java:module/ContryRest" is not matching "java:global/.../CountryRest" but what am I doing wrong ?
EDIT 1 : I was able to make #Ejb injection work by placing my Rest definitions ans EJBs in my webapp maven module deploy as a WAR. So it seems that the problem occur only when I deploy my EJB in a JAR. Any idea ? What could be the difference between JAR and WAR deployment ?
It is required by the JAX-RS spec that all REST endpoints must live within your WAR file. Do you really need an EAR file?
I've got some legacy code that runs in JBoss which looks something like:
#Stateless
#Remote(MyClass.class)
#RemoteBinding(jndiBinding = "app/Service")
public class myServiceBean {
// Some methods
}
When I look up the Bean in JNDI I have to use a string that looks like:
ear-name/Service/remote
I'm OK with the last two parts of the name, but I have an issue with "ear-file" being used as the context name. Because I build with Maven by default ear-file will contain the version number (which I do want for traceability), however it means I would have to change all the references to the service each time I issue a new version of the service!
How do I force the the context to something other than the name of the ear-file?
You can set up your ear name in application.xml like this:
<application-name>ear-name</application-name>
So you can have ear-namexxx.ear but your lookups will be made to ear-name
You can do the same for ejb modules as well:
<ejb-jar>
<module-name>ejb-name</module-name>
</ejb-jar>
Hope it helps!
Source https://developer.jboss.org/thread/158207
Although there already are quite some StackOverflow questions, blog entries, etc. on the web, I still cannot figure out a solution to the problem stated below.
Similar to this question (Injecting EJB within JAX-RS resource on JBoss7) I'd like to inject a EJB instance into a JAX-RS class. I tried with JBoss 5, JBoss 7, and WildFly 8. I either get no injection at all (field is null), or the server does not deploy (as soon as I try to combine all sorts of annotations).
Adding #Stateless to the JAX-RS makes the application server know both classes as beans. However, no injection takes place.
Is there a way to inject EJBs into a REST application? What kind of information (in addition to that contained in the question linked to above) could I provide to help?
EDIT: I created a Github project showing code that works (with Glassfish 4.0) and does not work (with JBoss 5).
https://github.com/C-Otto/beantest
Commit 4bf2f3d23f49d106a435f068ed9b30701bbedc9d works using Glassfish
4.0.
Commit 50d137674e55e1ceb512fe0029b9555ff7c2ec21 uses Jersey 1.8, which does not work.
Commit 86004b7fb6263d66bda7dd302f2d2a714ff3b939
uses Jersey 2.6, which also does not work.
EDIT2:
Running the Code which I tried on JBoss 5 on Glassfish 4.0 gives:
Exception while loading the app : CDI deployment failure:WELD-001408 Unsatisfied dependencies for type [Ref<ContainerRequest>] with qualifiers [#Default] at injection point [[BackedAnnotatedParameter] Parameter 1 of [BackedAnnotatedConstructor] #Inject org.glassfish.jersey.server.internal.routing.UriRoutingContext(Ref<ContainerRequest>, ProcessingProviders)]
org.jboss.weld.exceptions.DeploymentException: WELD-001408 Unsatisfied dependencies for type [Ref<ContainerRequest>] with qualifiers [#Default] at injection point [[BackedAnnotatedParameter] Parameter 1 of [BackedAnnotatedConstructor] #Inject org.glassfish.jersey.server.internal.routing.UriRoutingContext(Ref<ContainerRequest>, ProcessingProviders)]
at org.jboss.weld.bootstrap.Validator.validateInjectionPointForDeploymentProblems(Validator.java:403)
EDIT3: The crucial information might be that I'd like a solution that works on JBoss 5
If you don't want to make your JAX-RS resource an EJB too (#Stateless) and then use #EJB or #Resource to inject it, you can always go with JNDI lookup (I tend to write a "ServiceLocator" class that gets a service via its class.
A nice resource to read about the topic:
https://docs.jboss.org/author/display/AS71/Remote+EJB+invocations+via+JNDI+-+EJB+client+API+or+remote-naming+project
A sample code:
try {
// 1. Retreive the Home Interface using a JNDI Lookup
// Retrieve the initial context for JNDI. // No properties needed when local
Context context = new InitialContext();
// Retrieve the home interface using a JNDI lookup using
// the java:comp/env bean environment variable // specified in web.xml
helloHome = (HelloLocalHome) context.lookup("java:comp/env/ejb/HelloBean");
//2. Narrow the returned object to be an HelloHome object. // Since the client is local, cast it to the correct object type.
//3. Create the local Hello bean instance, return the reference
hello = (HelloLocal)helloHome.create();
} catch(NamingException e) {
} catch(CreateException e) {
}
This is not "injecting" per-se, but you don't use "new" as-well, and you let the application server give you an instance which is managed.
I hope this was useful and I'm not telling you something you already know!
EDIT:
This is an excellent example: https://docs.jboss.org/author/display/AS72/EJB+invocations+from+a+remote+client+using+JNDI
EDIT 2:
As you stated in your comment, you'd like to inject it via annotations.
If the JNDI lookup is currently working for you without problems, and
If you're using Java EE 6+ (which I'm guessing you are), you can do the following:
#EJB(lookup = "jndi-lookup-string-here")
private RemoteInterface bean;
I already have a integration-test phase, when I ran the selenium tests. I also want to run some unit tests in this phase, because the app is too much complex and have a lot of dependencies between his modules (a hell), so, after a week fighting against OpenEJB and Arquillian, I believe that this would be easier.
The thing is: how do I made it work?
I have the instance already running, if I instantiate an InitialContext and try to lookup some bean, I got an exception telling me that I have not set the java.naming.initial.factory, and I don't know what to put in there.
I'm also complaining about the annotated beans.
Suppose a Bean like this:
#Stateless
public class ABeanImpl implements ABean {
#EJB
private BBean;
}
Will the container automatically get right the BBean?
Thanks in advance
How to connect to JBoss 7.1 remote JNDI:
Here is the code snippet that I use for JBoss 7.1:
Properties props = new Properties();
String JBOSS_CONTEXT = "org.jboss.naming.remote.client.InitialContextFactory";
props.put("jboss.naming.client.ejb.context", true);
props.put(Context.INITIAL_CONTEXT_FACTORY, JBOSS_CONTEXT);
props.put(Context.PROVIDER_URL, "remote://localhost:4447");
props.put(Context.SECURITY_PRINCIPAL, "jboss");
props.put(Context.SECURITY_CREDENTIALS, "jboss123");
InitialContext ctx = new InitialContext(props);
Resolution of ambiguous ejb references:
According to JBoss EJB 3 reference, if at any level of your EJB environment (EJB/EAR/Server) are duplicates in used interfaces, exception will be thrown during resolution of injected beans.
Based on above, if you have got a reference to EJB bean which interface:
has two implementations in your EJB module (JAR/WAR) - exception will be thrown
has two implementations in your application (other EJB JAR's in same EAR) - exception will be thrown
has two implementations, one in module with bean ABeanImpl, second somewhere else - implemetation from current module is used.