Re: Call an EJB inside a WAR from jar

Thu, 06 Sep 2012 07:56:14 -0700 

Hi,
I haven't been following this thread since the start, but from the quotes on the lastest message I wonder wether you have a classloader problem. Have you already considered this? 


Hope this long explanation is intelligible and helps. If not, please 
forgive my intromission and my poor english.



This is very common for developers moving from JBoss to another app 
server, because the default config for JBoss (before 7.x) was the 
"unified classloader" (UC), where each deployment could see classes from 
other deployments. But the Java EE specs state that each deployment (and 
each subdeployment, i.e. package inside the same EAR) gets it own 
classloader and won't be able to see classes from other deployments or 
subdeployments.


See the error you got was a class loading exception:


JBException: Error while loading bean class 
org.test.galaxy.WarBroadcasterBean for bean WarBroadcasterBean.
Received message: Cannot locate the class 
org.test.galaxy.WarBroadcasterBean from the codebase

[/home/luca/bin/apache-tomee-snapshot/apps/Test.ear/pn-galaxy]:


Class WarBroadcasterBean is one of the implementations of interface 
BroadcasterBeanLocal, i.e., one of the EJBs that implements the same 
interface, am I right? It looks like either one of the subdeployments 
tried to load the implementation class for the EJB (they shouln't) or 
the implementation class itself has a dependency on some other 
class/interface that is not on it's own subdeployment classloader.



Usually, classes that are need for more than one subdeployment are 
packaged in a library JAR inside the EAR, vich becomes visible by all 
other subdeployment classloaders, and no other subdeployment includes 
the same class definitions. But JBoss developers are used to either copy 
the same classes to many subdeployments -- jboss UC will load the first 
definition found and ignore the others -- or having just one definition 
in the implementation package for the EJBs, and other subdeployments see 
them because of the UC. But both are packagings that violate the Java EE 
specs.



Maybe if you review the packaging structure x classloaders and ejb names 
you'll find something inconsistent.



[]s, Fernando Lozano


Yes, but even a plain EJB inside the war without any reference to other EJB
will fail.

I solved by implementing JMS client on the WAR application, so the ejb and
the war communicate through a queue.
Not the best, but at least it should be more consistent and portable among
different Application Servers.

On Thu, Sep 6, 2012 at 12:18 PM, Romain Manni-Bucau
<[email protected]>wrote:


Same reason i guess, you use cross ejb in your mdb?
Le 6 sept. 2012 11:47, "Luca Merolla" <[email protected]> a écrit :


I have tried to place an MDB in the WAR... It still fails in the same way
as for the Stateless bean.

On Thu, Sep 6, 2012 at 8:04 AM, Romain Manni-Bucau <

[email protected]

wrote:
It is but it leads to the kind of deployment lifecycle you have (and

from a

spec point of view not sure it is well defined)
Le 6 sept. 2012 00:17, "Luca Merolla" <[email protected]> a

écrit :

I have been investigating on this issue. The fact is failing not to

lookup

for the EJB that is inside the WAR, but it is failing while building

it.

If I do remove @Stateless and the interface implementation from the
WarBroadcasterBean it deploys fine and I guess WarBroadcaster is

considered

a CDI bean.
But in this case I'm not able to retrieve it by lookup...

It is not possible to have EJBs both inside a WAR and into a library

in

the

same EAR?

On Mon, Sep 3, 2012 at 6:44 PM, Romain Manni-Bucau <

[email protected]

wrote:
Hmm maybe i got it wrong but in an ear you can share ejb for

webapps

so

putting all ejb in  ejbmodules of the ear instead of war will make

it

consistent
Le 3 sept. 2012 18:29, "Luca Merolla" <[email protected]> a

écrit :

They are inside an EAR folder. Would it make any difference if I

do a

packaged EAR?

On Mon, Sep 3, 2012 at 3:33 PM, Romain Manni-Bucau <

[email protected]

wrote:
Hmm, either managing this case or packaging an ear should solve

it

IMO

Le 3 sept. 2012 14:18, "Luca Merolla" <[email protected]>

a

écrit :

I changed a bit the code and I gave a try with @EJB and I get

the

same

exception.

The reason why there was JNDI lookups is because we are

calling

actually

2

ejbs in 2 different wars that implements the same interface

private BroadcasterBeanLocal warBroadcaster;
private BroadcasterBeanLocal war2Broadcaster;

probably that can be solved with @EJB(name="") or something

similar.

However, I think the problem is related to the order of

deployment.

Basically when the EJB application (jar) is deployed, it

starts

with

Quartz

for the timers, but at that time the WAR application hasn't

been

deployed

yet so the warBroadcaster beans are not available and the

deployment

fails

with:

SEVERE: Application could not be deployed:
  /home/luca/bin/apache-tomee-snapshot/apps/Test.ear
org.apache.openejb.OpenEJBException: Creating application

failed:

/home/luca/bin/apache-tomee-snapshot/apps/Test.ear: Error

building

bean

'WarBroadcasterBean'.  Exception: class

org.apache.openejb.OpenE

JBException: Error while loading bean class
org.test.galaxy.WarBroadcasterBean for bean

WarBroadcasterBean.

Received

message: Cannot locate the class

org.test.galaxy.WarBroadcasterBean

from

  the codebase


[/home/luca/bin/apache-tomee-snapshot/apps/Test.ear/pn-galaxy]:

Error

while

loading bean class org.test.galaxy.WarBroadcasterBean for

bean

WarBroadcasterBean. Received message: C
annot locate the class org.test.galaxy.WarBroadcasterBean

from

the

codebase

[/home/luca/bin/apache-tomee-snapshot/apps/Test.ear/pn-galaxy]

         at



org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:929)

         at



org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:521)

         at



org.apache.openejb.assembler.classic.Assembler.buildContainerSystem(Assembler.java:422)

         at


org.apache.openejb.assembler.classic.Assembler.build(Assembler.java:330)

         at

org.apache.openejb.OpenEJB$Instance.<init>(OpenEJB.java:144)

         at org.apache.openejb.OpenEJB.init(OpenEJB.java:290)
         at


org.apache.tomee.catalina.TomcatLoader.initialize(TomcatLoader.java:231)

         at


org.apache.tomee.catalina.TomcatLoader.init(TomcatLoader.java:131)

         at



org.apache.tomee.catalina.ServerListener.lifecycleEvent(ServerListener.java:113)

         at



org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)

         at



org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)

         at



org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:401)

         at


org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:110)

         at

org.apache.catalina.startup.Catalina.load(Catalina.java:624)

         at

org.apache.catalina.startup.Catalina.load(Catalina.java:649)

         at

sun.reflect.NativeMethodAccessorImpl.invoke0(Native

Method)

         at



sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

         at



sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

         at java.lang.reflect.Method.invoke(Method.java:597)
         at

org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:281)

         at

org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:450)

Caused by: org.apache.openejb.OpenEJBException: Error

building

bean

'WarBroadcasterBean'.  Exception: class
org.apache.openejb.OpenEJBException: Error while loading bean

class

org.test.galaxy.WarBroadcasterBean for bean

WarBroadcasterBean.

Received

message: Cannot locate the class

org.test.galaxy.WarBroadcasterBean

from

the codebase


[/home/luca/bin/apache-tomee-snapshot/apps/Test.ear/pn-galaxy]:

Error

while

loading bean class org.test.galaxy.WarBroadcasterBean for

bean

WarBroadcasterBean. Received message: Cannot locate the class
org.test.galaxy.WarBroadcasterBean from the codebase


[/home/luca/bin/apache-tomee-snapshot/apps/Test.ear/pn-galaxy]

         at



org.apache.openejb.assembler.classic.EjbJarBuilder.build(EjbJarBuilder.java:81)

         at



org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:689)

         ... 20 more
Caused by: org.apache.openejb.OpenEJBException: Error while

loading

bean

class org.test.galaxy.WarBroadcasterBean for bean

WarBroadcasterBean.

Received message: Cannot locate the class
org.test.galaxy.WarBroadcasterBean from the codebase


[/home/luca/bin/apache-tomee-snapshot/apps/Test.ear/pn-galaxy]

         at



org.apache.openejb.assembler.classic.EnterpriseBeanBuilder.load(EnterpriseBeanBuilder.java:428)

         at



org.apache.openejb.assembler.classic.EnterpriseBeanBuilder.loadClass(EnterpriseBeanBuilder.java:405)

         at



org.apache.openejb.assembler.classic.EnterpriseBeanBuilder.build(EnterpriseBeanBuilder.java:81)

         at



org.apache.openejb.assembler.classic.EjbJarBuilder.build(EjbJarBuilder.java:66)

         ... 21 more




On Mon, Sep 3, 2012 at 1:47 PM, Thiago Veronezi <

[email protected]

wrote:


You could remove the init method altogether and simple

inject

the

bean

in

your object...

@EJB
private WarBroadcaster warBroadcaster;

This way you avoid JNDI lookups.

[]s,
Thiago.


On Mon, Sep 3, 2012 at 7:10 AM, Luca Merolla <

[email protected]

wrote:


Hi,

I have a piece of code that I would like to port from

JBoss

to

TomEE.

The old code, which was working on JBoss, is like that.

Inside

the

same

EAR

folder I have:

- EJB jar (with EJBs and timers)
- WAR (web application, with 1 EJB)

I have a requirement that the ejb timers (a method

annotated

with

@Schedule)
will perform a task every X seconds.
This method calls an EJB (inside the jar) that will call

another

EJB,

but

this time in a WAR application.

Basically the EJB in the jar has something like that:

@PostConstruct
public void init() {
log.info("INIT-BROADCASTERS");
try {
  warBroadcaster = (BroadcasterBeanLocal) initialContext
.lookup("java:app/pn-test/WarBroadcasterBean");
} catch (NamingException e) {
log.error("Problem looking up for broadcasters", e);
}
}

This approach seems to not work on TomEE. I have tried to

add:

Properties p = new Properties();
p.put(Context.INITIAL_CONTEXT_FACTORY,
"org.apache.openejb.client.LocalInitialContextFactory");
final InitialContext initialContext = new

InitialContext(p);

But still it can't find the bean. I don't know if it's

possible

to

do

something like that but anyway if you have any

suggestions

or

different

approach I would be very keen to refactor this code to

make

it

work

properly on TomEE.

Thanks in advance,
Luca

























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