Compilation Home Interface

when Home Interface is compiled, it gives an error saying there is no Remote Interface.
(ie)
Ex:
testHome.java
public interface testHome extends EJBHome
public abstract testRemote create() throws CreateException, RemoteException;
When the above Home interface is compiled, it gives an error,
cannot resolve sysmbol : testRemote
Due to this iam not able to proceed....
testRemote is not compiled.....

It is unable to find the class testRemote. You should check if both classes( testHome & testRemote ) are in the same package.

Similar Messages

Problem in compiling home interface

my home interface is this:
package examples;
public interface HelloHome extends javax.ejb.EJBHome
Hello create() throws java.rmi.RemoteException, javax.ejb.CreateException;
and on compiling i get the following error message:
cannot resolve symbol
symbol: class Hello
location: interface examples.HelloHome
Hello create() throws java.rmi.Exception,
^ javax.ejb.CreateException;
I have just started on ejbs can someone help.
thank you.

Does anyone have an answer for this query? I'm experiencing the exact same problem...
Please give some insight into this situation. Maybe it's something very simple, but when you start out like me even the smallest problem is a big one.
thanX in advance for any help given

Error compiling home interface

I get this error when I try to compile my home interface:
c:\sun\appserver\jdk\bin\javabean\InterestCalculatorHome.java:15: cannot find sy
mbol
symbol : class InterestCalculator
location: interface javabean.InterestCalculatorHome
public InterestCalculator create() throws RemoteException,
^
1 error
Does anyone know what the means? or how to fix it?
thanks

All my files are in the same package
Advice is the remote interface, AdviceHome is the home interface & AdviceBean is the bean class.
Advice & AdviceBean have compiled fine. But i am getting this error in compiling the AdviceHome interface.
By the way i just tried doing *.java instead of giving individual files & they got compiled.
Thanks.

EJB problem with home interface

Hi firends
I am beginner to EJB world, and trying first EJB object i.e. Hello World program
I prepared first Remote interface, HelloBean and it compiled also properly.
names of program
Remote interface : Hello
Bean: HelloBean
Home interface : HelloHome
But after preparing Home interface it fails to compile at position of create()
the declaration is
public Hello create() throws RemoteException,CreateException
compilation error pointing at Hello in above statement saying 'Cannot resolve symbol'
The fact is all these files are located in same directory only
can anyone help me in this problem as I am eger to execute my first program and want to go further in EJB
thanx in advance
Mandar

Hi Mandar,
How are you setting the classpath and what exactly is it set to?
Unresolved symbol can only mean that the class cannot be found in the classpath. If two files are in the same directory and one has a dependency on the other then adding '.' to the classpath is all that is needed. Questions to ask yourself. Are the files in the same directory? does either include a 'package' statement? and are you absolutely certain that the classpath is set correctly (type 'set' at the command line)? Also if you have set the CLASSPATH variable, using -classpath with the javac command will override the variable.
Check everything above and if you still have problems maybe we can get some more details if you can post the entire error message.
Mandy

Error in accessing the create method declared in Home interface

hi,
I have create method in home interface which takes the following syntax:
public ShipRemote create(ShipPK id,String name,int capacity,float tonnage) throws CreateException,RemoteException;
In the client I create a remote object and try to call this create method, but I get a compilation error :
it says unable to resolve the symbol with a cursor pointing the create method
interface sampleEJB.ship.shipInfo.ShipHome ShipRemote remoteRef=(ShipRemote)homeRef.create(spk,sname,5000,100.7);
how can i resolve this.
I have implemented this create method in my bean

hi i have compiled the client interfaces and the bean successfully.
I have also imported the classes in the in the client code .
I even deployed my jar successfully, but i have problem in accessing the create method specified .
thank you

Remote and Home Interfaces

Why do we need a home interface and remote interface for a ejb.
Must these interfaces be there for each ejb?

Why do we need a home interface and remote interface
for a ejb.The Home interface is like a factory for getting to your beans. The remote interface is what you use to speak "directly" to the bean. It's remote because the bean is usually on a remote server somewhere (not in the same VM as your client code). The same is true for the home interface in terms of it being remote.
The corresponding LocalHome and Local interfaces are for use when the bean in question is not remote.
Must these interfaces be there for each ejb?You need either a Home and Remote or LocalHome and Local interface for all beans except Message Driven Beans.

Unable to deploy EJB 3.0 on JBoss 4.0.4GA - no home interface

I am stuck in that my EJB3.0 project (one entity bean, one session bean and one client test bean) builds OK but somehow Eclipse Europa is unable to deploy it to JBoss (4.0.4 GA and 5 Beta) -- something to do with JNDI error as it involves javax.naming exceptions.
My Eclipse directory structure is :-
Titan (project name)
|
ejb - com.titan (package name)
| |
| domain -> Cabin.java (my entity bean)
| |
| travelagent -> TravelAgentBean.java
| -> TravelAgentRemote.java
|
META_INF -> ejb-jar.xml
-> MANIFEST.MF
-> persistence.xml
My ejb-jar.xml is :
<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar id="ejb-jar_ID" version="2.1" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/ejb-jar_2_1.xsd">
<display-name>Titan</display-name>
<enterprise-beans>

<session >
<display-name>TravelAgentBean</display-name>
<ejb-name>com/titan/travelagent/ejb/TravelAgentBean</ejb-name>
<remote>com.titan.travelagent.ejb.TravelAgentRemote</remote>
<ejb-class>com.titan.travelagent.ejb.TravelAgentBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
</session>
</enterprise-beans>
</ejb-jar>
And my persistence.xml is :
<?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="Titan">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>com.titan.domain.Cabin</class>
<properties>
<property name="hibernate.connection.driver_class" value="oracle.jdbc.OracleDriver" />
<property name="hibernate.connection.url"
value="jdbc:oracle:thin:@localhost:1521:XE" />
<property name="hibernate.connection.username" value="SYSTEM" />
<property name="hibernate.connection.password" value="Swordfish1" />
</properties>
</persistence-unit>
</persistence>
I right-click on the Titan project name and choose Build Project. I get the following error message :-
13:01:06,046 WARN [verifier] EJB spec violation:
Bean : com/titan/travelagent/TravelAgentBean
Section: 7.11.2
Warning: A Session bean must implement, directly or indirectly, the javax.ejb.SessionBean interface.
13:01:06,046 WARN [verifier] EJB spec violation:
Bean : com/titan/travelagent/TravelAgentBean
Section: 7.11.3
Warning: A Session bean must define at least one ejbCreate method.
13:01:06,046 WARN [verifier] EJB spec violation:
Bean : com/titan/travelagent/TravelAgentBean
Section: 7.11.1
Warning: The session bean must implement either a remote home and remote, or a local home and a local interface or a service endpoint interface.
13:01:06,062 ERROR [MainDeployer] Could not create deployment: file:/C:/jboss-4.0.4.GA/server/default/deploy/Titan.jar
I don't understand, because as of EJB 3.0, you don't really need a home or local-home interface anymore...

Using @SecurityDomain("exemplo1") in my EJB and NOT providing jboss.xml, it works.
@SecurityDomain("exemplo1")
@RolesAllowed("yyy")
@Stateless(name="UserManagement")
public class UserManagementBean implements UserManagement {
public void add(User user) {
}Damn! This is some serious shit... I don�t want to configure this in every single EJB.
EJB 3.0 is nice, but some small trivial details like this and others, that was forgotten by Sun, piss me off!

How to find out local or home interface was used ?

Hi !
are there any ways in the code of methods ejbCreate and ejbRemove in my entity EJB to find out were they called via local or home interface provided that my bean has both local or home interfaces ?
Thenks in advance.

Why should you care, this logic should only be implemented in the client (SEJB or Servlet). Even then it should only be used to check if there is a LocalHomeInterface. If not you get the RemoteHomeInterface. I don't understand the question completely.

Can't find Home Interface

[WLS6.1 sp1]
[Solaris Sparc]
After the wls run some times, it sometimes can't find the ejb's home
interface. It means, i can't find the home in the JNDI tree. But if restart,
no error. WHY?????
And, i doubt the stable of wls. so many 'Out of memory' and 'no stack
trace', who can direct me to right way

None error message at deployment. At runtime, it shows
[BusiAcctFeeEjb][getAcctBalance]ERROR]:javax.naming.NameNotFoundException:
Unable to resolve oss.demo.balance.PreAcctHome. Resolved:
'oss.demo.balance'
Unresolved:'PreAcctHome' ; remaining name
''javax.naming.NameNotFoundException: Unable to resolve
oss.demo.balance.PreAcctHome. Resolved: 'oss.demo.balance'
Unresolved:'PreAcctHome' ; remaining name ''
<<no stack trace available>>
If restart, none change, all ok!
"Rob Woollen" <[email protected]> ??????:[email protected]..
airwing wrote:
Thanks Rob.
After the wls run some times, it sometimes can't find the ejb's
home
interface. It means, i can't find the home in the JNDI tree. Butif
restart,
no error. WHY?????this occured when I run ant again to deploy my bean. It said 'can'tlookup
demo.test.TestHome'.I don't understand. Does this error occur during deployment, or does
the
client throw the exception? Can you show me the actual error message or
stack trace?
-- Rob
And when I display the jndi tree in wls console, only demo.test , no
TestHome. everything ok when
I restart server
"Rob Woollen" <[email protected]> ??????:[email protected]..
airwing wrote:
[WLS6.1 sp1]
[Solaris Sparc]
After the wls run some times, it sometimes can't find the ejb's
home
interface. It means, i can't find the home in the JNDI tree. Butif
restart,
no error. WHY?????You'll have to provide some more information for us to help you
debug
this.
And, i doubt the stable of wls. so many 'Out of memory' and 'no
stack
trace', who can direct me to right wayOutOfMemory indicates that you've exhausted the JVM's heap. Perhapsyou
need
to increase the size.
The no stack trace error message generally indicates that you have a
RemoteException which had a server-side stack trace. You can turn
the
InstrumentStackTraces option on to see them.
-- Rob

Lookup for local home interface

Hi!
I am using the j2eesdk and there is a thing I cannot find anywhere:
When I use a local interface for a bean and define an EJB Ref on that bean in the 'deploytool', I cannot specify a JNDI name (only a bean name). Therefore I cannot map the coded name in my Context-lookup() call in the code to any JNDI name on the applications 'JNDI Names' tab.
My question is:
- how do I lookup local home interfaces?
- if this is done via JNDI, how do I do this in the deploytool?
Kind Regards
Ralf

Hi
The point u all should understand is you use a jndi name in your programs
say
public static void main(String[] args)
InitalContext ctx = new IntialContext();
ctx=(Context)ctx.lookup("java:comp/env");
DemoLocalHome home = ctx.lookup("ejb/DemoBean");
in the above program you use "ejb/DemoBean" as a reference name, but actually there won't be a Bean registered with that name. so, when u deploy the appclient u should map the reference name with the actual JNDI name ( if it's a remote interface) or with the class name (Local interface)
so, when u deploy the appclient in the "ejb ref " tab, u specify that it uses Local interfaces and in the end u don't map the refernce name to a JNDI name( because it's a local interface) and rather u speciy the class name.
that's how u map the references for Remote and Local home interfaces.....
thank's for listening to that......
for more suggestions mail me at [email protected]

Home Interface Load Balancing with user transactions

Hi
          Im running the following Client scenario:
          * gets initial context
          * lookup for Home Interface.
          * save the Home Interface.
          * Begin User Transaction
          * Home.findByPrimaryKey(pk)
          * activate some business method
          * Commit transaction.
          * close context
          now repeat but use the saved home interface
          * gets initial context
          * get saved Home Interface.
          * Begin User Transaction
          * Home.findByPrimaryKey(pk)
          * activate some business method
          * Commit transaction.
          * close context
          It seems that once i use the Home finder under a transaction the home
          interface will stick to the first server and load balancing won't work
          (doesn't matter if its round-robin or random).
          that means that in both cases the EjbObject i use is on the same server.
          please correct me if im wrong.
          but if im right is this a weblogic bug? or maybe a feature?
          thanks
          Dror Last


You will find that most engineers at BEA strong recommend NOT using UserTxns, unless you've got some
          complex nest transaction modeling that can't be done with BMT.
          From your case, it looks as if you should use a Session-bean facade between your servlets and entity
          beans; this way you set the session bean BMT attribute to whatever you wanted using
          UserTransaction; try this out and see what happens with load-balancing... we use BMT in clustered
          servers and load-balancing works great.
          Gene
          "Dror Last" <[email protected]> wrote in message news:[email protected]...
          > Im using Weblogic 5.1 / SP8
          >
          > <home-is-clusterable> set to TRUE on all beans.....
          >
          >
          > I have a big Question Mark if weblogic clustering does have load balancing
          > while the client (Servlet Engine in my case) Uses User Transactions.
          >
          > thanks
          > Dror Last
          >
          >
          > "Gene Chuang" <[email protected]> wrote in message
          > news:[email protected]...
          > > What WL version are u using, and what do you have <home-is-clusterable>
          > set to?
          > >
          > > Gene
          > >
          > > "Dror Last" <[email protected]> wrote in message
          > news:[email protected]...
          > > > Hi
          > > >
          > > > Im running the following Client scenario:
          > > >
          > > > * gets initial context
          > > > * lookup for Home Interface.
          > > > * save the Home Interface.
          > > > * Begin User Transaction
          > > > * Home.findByPrimaryKey(pk)
          > > > * activate some business method
          > > > * Commit transaction.
          > > > * close context
          > > >
          > > > now repeat but use the saved home interface
          > > >
          > > > * gets initial context
          > > > * get saved Home Interface.
          > > > * Begin User Transaction
          > > > * Home.findByPrimaryKey(pk)
          > > > * activate some business method
          > > > * Commit transaction.
          > > > * close context
          > > >
          > > > It seems that once i use the Home finder under a transaction the home
          > > > interface will stick to the first server and load balancing won't work
          > > > (doesn't matter if its round-robin or random).
          > > >
          > > > that means that in both cases the EjbObject i use is on the same server.
          > > >
          > > > please correct me if im wrong.
          > > >
          > > > but if im right is this a weblogic bug? or maybe a feature?
          > > >
          > > > thanks
          > > > Dror Last
          > > >
          > > >
          > >
          > >
          >
          >

ClassNotFound while narrowing JNDI ref to ejb home interface

Hello everybody
I'm quite new to BEA WebLogic. I deployed Jasmine application on Bea WLS7 (example
app from Mastering EJB 2). But when i tried to use login servlet, it threw an
exception ClassNotFound when narrowing ejb home interface (obtained via JNDI).
EJBs are in .jar file, and web files are in the .war file, maybe this is the problem.
Should I copy ejb classes to .war file, or make some tricks with CLASSPATH, or
maybe there is better way to make it work (maybe via J2EE references or something
like this).
Thanks in advance

Strange. And you do not have any application classes in the system
classpath?
Konrad R. <[email protected]> wrote:
"Dimitri I. Rakitine" <[email protected]> wrote:
Did you deploy ejbs and war in the same ear?
Yes, both were packed up into one .ear archive>>
Konrad R. <[email protected]> wrote:
Hello everybody
I'm quite new to BEA WebLogic. I deployed Jasmine application on BeaWLS7 (example
app from Mastering EJB 2). But when i tried to use login servlet, itthrew an
exception ClassNotFound when narrowing ejb home interface (obtainedvia JNDI).
EJBs are in .jar file, and web files are in the .war file, maybe thisis the problem.
Should I copy ejb classes to .war file, or make some tricks with CLASSPATH,or
maybe there is better way to make it work (maybe via J2EE referencesor something
like this).
Thanks in advance--
Dimitri

Why do we need a Home Interface?

Hi Guys,
I am new to EJB. i am some questions.
1) Why do we need a Homeinterface?
2) Where does container generated classes for both the interface located(assume we have 2 machine, one is client and another is server)
In RMI we hv stubs and skeletons located in client and server side....similarly how it is designed in EJB?
Thanks & Regards
-vijay

In EJB3.0 the home interface has been removed. The purpose of home interface was to serve as a factory for finding/creating/destroying an enterprise bean instance. I am not sure why exactly the architects of ejb created a home interface. May be they thought its better to have a clear seperation of responsibilities, that is home interface for the above said purpose and component interface (a.k.a remote interface) for executing the business methods. Also you need to understand that the client never deals directly with a bean instance. The client always calls a bean's home or remote interface methods whose execution is delegated to the actual bean instance. This mechanism provided more flexibility for the container in creating and managing enterprise bean's instances. Hope this helps.

Why do we use a home interface in EJB

I am trying to figure out why we need to use a HOME Interface in every EJB that we deploy in a container ? What is the significance ?
Thanks

Some info:
A home interface defines the methods that allow a client to create, find, or remove an enterprise bean. The home interface is EJB's way of creating an object. Home interfaces act as factories to create session beans and entity beans. The home interface defines the bean's life cycle methods, One of two interfaces for an enterprise bean. The home interface defines zero or more methods for creating and removing an enterprise bean. For session beans, the home interface defines create and remove methods, while for entity beans, the home interface defines create, finder, and remove methods.
You may want to also look up:
http://java.sun.com/j2ee/learning/tutorial/
http://java.sun.com/developer/onlineTraining/J2EE/Intro2/j2ee.html

Unable to bind EJB Home Interface to the JNDI name

Why do I get this error?? What is the jndi-name in weblogic-ejb-jar.xml
Unable to deploy EJB: OrganizationEJB from sempire_bc.jar:
Unable to bind EJB Home Interface to the JNDI name:
com.sempire.builder.business
_component.Organization. The error was:
javax.naming.NameAlreadyBoundException: Organization is already bound;
remaining
name 'com.sempire.builder.business_component'
<<no stack trace available>>

Slava,
In case I change the name of the jndi name to a unique name. I still get the same
problem. I checked for multiple occurences, but there aren't any.
My web.xml file is:
<ejb-local-ref>
<description>
Reference EJB resources in Weblogic Resources
</description>
<ejb-ref-name>GangsterEJB</ejb-ref-name>
<ejb-ref-type>Entity</ejb-ref-type>
<local-home>com.sempire.builder.business_component.GangsterHome</local-home>
<local>com.sempire.builder.business_component.Gangster</local>
</ejb-local-ref>
My weblogic-ejb-jar.xml file is:
<weblogic-enterprise-bean>
<ejb-name>GangsterEJB</ejb-name>
<entity-descriptor>
<persistence>
<persistence-type>
<type-identifier>WebLogic_CMP_RDBMS</type-identifier>
<type-version>6.0</type-version>
<type-storage>META-INF/weblogic-cmp-rdbms-jar.xml</type-storage>
</persistence-type>
<persistence-use>
<type-identifier>WebLogic_CMP_RDBMS</type-identifier>
<type-version>6.0</type-version>
</persistence-use>
</persistence>
</entity-descriptor>
<reference-descriptor>
<resource-description>
<res-ref-name>jdbc/GangsterDB</res-ref-name>
<jndi-name>oraclePool</jndi-name>
</resource-description>
</reference-descriptor>
<local-jndi-name>Gangster_test</local-jndi-name>
</weblogic-enterprise-bean>
I do not get the problem.
Thank you
Ronak Parekh
"Slava Imeshev" <[email protected]> wrote:
Hi Ronak,
This exception means that you already have a bean
with the same JNDI name. Search your weblogic-ejb-jar.xml files
for multiple occurrences of the name and fix the problem.
Regards,
Slava Imeshev
"Ronak Parekh" <[email protected]> wrote in message
news:[email protected]...
Why do I get this error?? What is the jndi-name in weblogic-ejb-jar.xml
Unable to deploy EJB: OrganizationEJB from sempire_bc.jar:
Unable to bind EJB Home Interface to the JNDI name:
com.sempire.builder.business
_component.Organization. The error was:
javax.naming.NameAlreadyBoundException: Organization is already bound;
remaining
name 'com.sempire.builder.business_component'
<<no stack trace available>>

Compilation Home Interface

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