I can lookup EJB using the following way when I deploy EJB as a seperate component in Weblogic 12c.
ctx.lookup("EJBImpl#com.xyz.EJBSendQ");
How can I lookup the same EJB when I put it inside an EAR. Let's say for example,
main-application.ear
webservice.war
ejb.jar
Now, I included my ejb component inside war file and I lookup in the following way,
EJBSendQ sendQ = (EJBSendQ) ctx.lookup("java:module/EJBSendQImpl")
So this is how we lookup our EJB If we put local enterprise bean within same module,
java:module/enterprise bean name/[interface name]
Reference:
https://docs.oracle.com/javaee/6/tutorial/doc/gipjf.html
Related
I have a big problem on getting the correct instance or at least casting the instance I got with JNDI-lookup to correct interface at Web Sphere Liberty (16.0.0.4, running on Java 7, though using Oracle Java 1.8.0_45 in the back, developing on Eclipse Neon.2).
When I start the server and the ear containing the EJB, I get the following notification into the log:
The server is binding the xxx.interfaces.MyLocal interface of the MyEJB enterprise bean in the xxx-ejb.jar module of the xxx-ear application. The binding location is: java:global/xxx/MyEJB!xxx.interfaces.MyLocal
Then I have a web application (ear) which has a service provider (with #Produces) for the previously started ejb-service, which will provide the JNDI resource as injectable (#Inject) for the rest of the application (a bit tricky thing, the main idea is to allow to change the lookup location from configuration file + do some other stuff also). It seems to work correctly for all it is supposed to, but when getting the JNDI-resource, it kind of works but not correctly.
If I put the ejb part as a dependency into my web-module, I can inject it directly (#Inject MyLocal myEjb;).
As the injected resource I get an object with the signature:
EJSMyLocal0SLMyEJB_a4549339#cc5d2cdd
with lookup I get an object with signature (at the same time as the inject):
EJSMyLocal0SLMyEJB_a4549339#cdda36a7
(Not the same instance afaik, but the "type" is correct?)
The injected resource is correctly (automatically of course) cast on 'MyLocal' interface and is ok.
When I try to check the resource got with JNDI, it does not qualify as an instance of 'MyLocal' nor as 'MyRemote'? Also the actual cast fails of course with ClassCastException. (MyRemote is basically the same as the MyLocal interface ... MyLocal extends MyRemote, both interfaces are accordingly annotated with #Local and #Remote)
The EJB looks like this at the time of testing...
#Stateless
#Named
#Default
#Local(MyLocal.class)
#Remote(MyRemote.class)
public class MyEJB implements MyLocal, MyRemote { ... }
I also tried to cast the JNDI resource like this.
InitialContext ic = new InitialContext();
Object lookedUpEjb = ic.lookup(lookup); // the 'java:global...' from log
MyRemote jndiEjb = (MyRemote) PortableRemoteObject.narrow(lookedUpEjb, MyRemote.class)
// Tried also casting/checking 'instanceof' to MyLocal...
No difference with that, the same ClassCastException occurs?!
I have the following features in server.xml
<featureManager>
<feature>javaee-7.0</feature>
<feature>ldapRegistry-3.0</feature>
<feature>localConnector-1.0</feature>
<feature>adminCenter-1.0</feature>
<feature>wsSecurity-1.1</feature>
<feature>ejbLite-3.2</feature>
<feature>ejbRemote-3.2</feature>
<feature>cdi-1.2</feature>
<feature>jpa-2.1</feature>
<feature>jsf-2.2</feature>
<feature>jaxrs-2.0</feature>
<feature>jaxws-2.2</feature>
</featureManager>
I found this documentation on the Liberty JNDI functionality:
https://www.ibm.com/support/knowledgecenter/SSAW57_liberty/com.ibm.websphere.wlp.nd.multiplatform.doc/ae/twlp_ejb_remote.html
I can't see where I go wrong. How do I cast that object from JNDI lookup to MyLocal or MyRemote interfaces?
---- Note ----
Using the #EJB annotation is not an option (it works though), since it will be hard coded reference to the resource. I want it to be optional though, thus JNDI lookup. #EJB will cause the app to crash when the resource is not available.
The problem is that each application has a different ClassLoader and the object that has been bound into JNDI was loaded with the ClassLoader of the application that defined the EJB.
This should not be an issue for Remote EJB interfaces as the ORB should have taken care of this for you. On a remote call that returns such an object, the ORB will serialize the object (from the target ClassLoader) and then deserialize using the client ClassLoader. For a lookup like this, the PortableRemoteObject.narrow should also take care of this. The failure here appears to just be a bug in the ORB.
In order to support cross application access to Local EJB interfaces, either the Local EJB interface needs to be moved to a shared library, that is used by both applications, or both applications configured to use a single global ClassLoader. See this link for more information about using Local EJB interfaces across applications: Correct way to lookup local EJB in websphere - Getting ClassCastException (Note: this link is discussing traditional WebSphere, but the issue is the same with Liberty, as is the resolution to use a shared library for the interface).
(Please be kind, these are my first steps in Java EE).
I'm working with Netbeans 8.1, deploying an EJB module on a local Glassfish Server.
I have a glassfish-resource.xml with the following resource defined:
<jdbc-resource enabled="true" jndi-name="java:app/jdbc/myDataSource"
And I have a DAO class where I'm trying to inject that resource
#Named
public class SimpleDal {
#Resource(name = "jdbc/myDataSource", lookup = "java:app/jdbc/myDataSource")
private static DataSource ds ;
I have tried several ways to make this work but I always end up with NULL in the variable ds. I've been debugging and querying the Context, and I always end up with the name java:app/jdbc/myDataSource not found.
Maybe I'm not doing something right, this is my first steps on Java EE (I've always developed for PHP). Can somebody please direct me in order to avoid losing more time? Thanks
Note: I've add the #Named annotation to the SimpleDal class because I've read somewhere that in order to Injection to work, I have to be on a Bean.
So, after some time I finally found out that injection doesn't work reliably on static fields (at least on my setup). Changed the field to an instance field and It worked . Posting this answer for anyone who is facing the same situation
I am currently migrating a Grails 2.4 project to Grails 3.0.10 or 3.1.0.M3.
In Grails 2.4, the following method is a workaround that allows me to detect whether a Domain Class features a composite primary key:
void isCompositePrimaryKey(GrailsDomainClass targetClass) {
def binder = new GrailsDomainBinder()
def idMapping = binder.getMapping(targetClass).identity
return idMapping instanceof org.codehaus.groovy.grails.orm.hibernate.cfg.CompositeIdentity
}
I cannot find a way to detect this in the Public API.
Though GrailsDomainClass still exists in the implementation source code, I cannot seem to access it from my project nor can I find the old CompositeIdentity.
An alternative strategy could be via targetClass.getIdentifier().getType()
but I cannot find any documentation on how to detect a composite key using the identity type.
Solved this simply by adding an additional explicit (non-transitive) dependency to build.gradle for the Hibernate 4 GORM implementation package.
(I determined the package and version by looking in the local gradle files cache but gradle dependencies would also have worked.)
Added to build.gradle:
compile 'org.grails:grails-datastore-gorm-hibernate4:5.0.0.RC2'`
This allows access to the internal API, then the above method still works.
NB. The GORM developers also advise that there is existing GORM API for this, via the PersistentEntity and MappingContext classes without using GrailsDomainClass.
Any one have an idea how to use a dynamic baseurl??
f.e: I have file.war and I want to deploy the same war for www.webapp1.com & www.webapp2.com
I tried to use alias for my server.xml host, and I tried to use a separated host in server.xml.. but every time I try webapp2.com url I get the webapp1.com.
Grails registers a bean named grailsLinkGenerator. I believe you can accomplish what you're trying to do by overriding this bean with your own custom logic. Your bean must implement the LinkGenerator interface. You might find it easiest to extend DefaultLinkGenerator or CachingLinkGenerator
I have been trying to use JNDI to store my own predefined objects with no success. I can get the jdbc object from the InitialContext and gain access to the connection object as shown below
Class.forName("com.mysql.jdbc.Driver");
InitialContext context = new InitialContext();
DataSource dataSource = (DataSource) context
.lookup("jdbc/DataSource");
Now i need to know how to add my own objects to the jndi directory. Also please can you explain the architecture of jndi service
I need to know how to add my own objects to the jndi directory.
Define them as named resources in your Tomcat context.xml, if you're using Tomcat, or the equivalent in whatever your servlet container is. If you mean to do this at runtime, you can't, that's not what it's for.
Also please can you explain the architecture of jndi service
Far too broad a question for StackOverflow. Try the JNDI Tutorial.