9:52 p.m.
I posted this problem on StackOverflow, but after doing more research, I'm
not sure if this is a Weld, JBoss/WildFly or undertow issue. Or whether
its a framework issue, or how the framework is being used. If this is not
the correct list, can you please let me know which list/group I should be
directing the issue to?
I'm running into a strange problem and error message that I do not
understand. I'm running my application on JBoss 7 EAP.
Caused by: java.lang.ClassCastException: Cannot cast
ejbs.LoginManager$417755913$Proxy$_$$_Weld$EnterpriseProxy$ to
ejbs.LoginManager
I'm trying to programatically retrieve an EJB from the CDI context by using
its interface and am getting this error message. I've created a sample
proof-of-concept that is trying to retrieve EJB beans from the CDI context
public <T> T getSesionBean(Class<T> clazz, String name) {
Properties properties = new Properties();
try {
InitialContext initContext = new InitialContext();
return clazz.cast(CDI.current().select(clazz).get());
} catch (Exception e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}}
It is being called as:
LoginManager login = getSesionBean(LoginManager.class);
with my EJB defined as:
@Stateless(name="LoginManager")@Local(LoginManager.class)(a)LocalBinding(jndiBinding="LoginManager")public
class LoginManagerBean implements LoginManager {.........}
I don't understand it. I'm expecting the bean being retrieved from the
context to be a proxy. Shouldn't it be castable to my interface? Otherwise,
how am I supposed to retrieve it?
More interestingly, this does not seem to be a consistent error; sometimes
the code works fine. Sometimes it fails. I haven't been able to determine
what makes it work or throw an exception.
I found a related issue here <https://issues.jboss.org/browse/WELD-1498>;,
but not sure if this is the same problem and/or which version of Weld is
used in JB7EAP. I'm including the following dependency in my application:
<dependency>
<groupId>org.wildfly</groupId>
<artifactId>wildfly-ejb-client-bom</artifactId>
<version>10.1.0.Final</version>
<type>pom</type>
</dependency>
Am I doing something completely wrong? If this is a Weld bug, can I use a
different proxy system than Weld? Is this even configurable in undertow?
Thanks,
Eric
6:01 p.m.
It sounds like a class loading problem. You likely have two copies of
ejbs.LoginManager, and somehow you are using the wrong one. If you
look at the output of
System.out.println(LoginManager.class.getClassLoader()) and
System.out.println(CDI.current().select(clazz).get().getClass().getClassLoader())
it should give you a clue.
This is not an Undertow issue.
Stuart
On Fri, Apr 14, 2017 at 11:52 AM, Eric B <ebenzacar(a)gmail.com> wrote:
I posted this problem on StackOverflow, but after doing more
research, I'm
not sure if this is a Weld, JBoss/WildFly or undertow issue. Or whether its
a framework issue, or how the framework is being used. If this is not the
correct list, can you please let me know which list/group I should be
directing the issue to?
I'm running into a strange problem and error message that I do not
understand. I'm running my application on JBoss 7 EAP.
Caused by: java.lang.ClassCastException: Cannot cast
ejbs.LoginManager$417755913$Proxy$_$$_Weld$EnterpriseProxy$ to
ejbs.LoginManager
I'm trying to programatically retrieve an EJB from the CDI context by using
its interface and am getting this error message. I've created a sample
proof-of-concept that is trying to retrieve EJB beans from the CDI context
public <T> T getSesionBean(Class<T> clazz, String name) {
Properties properties = new Properties();
try {
InitialContext initContext = new InitialContext();
return clazz.cast(CDI.current().select(clazz).get());
} catch (Exception e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}
}
It is being called as:
LoginManager login = getSesionBean(LoginManager.class);
with my EJB defined as:
@Stateless(name="LoginManager")
@Local(LoginManager.class)
@LocalBinding(jndiBinding="LoginManager")
public class LoginManagerBean implements LoginManager {
...
...
...
}
I don't understand it. I'm expecting the bean being retrieved from the
context to be a proxy. Shouldn't it be castable to my interface? Otherwise,
how am I supposed to retrieve it?
More interestingly, this does not seem to be a consistent error; sometimes
the code works fine. Sometimes it fails. I haven't been able to determine
what makes it work or throw an exception.
I found a related issue here, but not sure if this is the same problem
and/or which version of Weld is used in JB7EAP. I'm including the following
dependency in my application:
<dependency>
<groupId>org.wildfly</groupId>
<artifactId>wildfly-ejb-client-bom</artifactId>
<version>10.1.0.Final</version>
<type>pom</type>
</dependency>
Am I doing something completely wrong? If this is a Weld bug, can I use a
different proxy system than Weld? Is this even configurable in undertow?
Thanks,
Eric
_______________________________________________
undertow-dev mailing list
undertow-dev(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/undertow-dev
10:09 a.m.
Hi Eric,
feel free to ask on Weld ML, irc, gitter or forums -
http://weld.cdi-spec.org/community
And if possible provide a simple test app/reproducer.
Martin
Dne 18.4.2017 v 00:01 Stuart Douglas napsal(a):
It sounds like a class loading problem. You likely have two copies
of
ejbs.LoginManager, and somehow you are using the wrong one. If you
look at the output of
System.out.println(LoginManager.class.getClassLoader()) and
System.out.println(CDI.current().select(clazz).get().getClass().getClassLoader())
it should give you a clue.
This is not an Undertow issue.
Stuart
On Fri, Apr 14, 2017 at 11:52 AM, Eric B <ebenzacar(a)gmail.com> wrote:
> I posted this problem on StackOverflow, but after doing more research, I'm
> not sure if this is a Weld, JBoss/WildFly or undertow issue. Or whether its
> a framework issue, or how the framework is being used. If this is not the
> correct list, can you please let me know which list/group I should be
> directing the issue to?
>
> I'm running into a strange problem and error message that I do not
> understand. I'm running my application on JBoss 7 EAP.
>
> Caused by: java.lang.ClassCastException: Cannot cast
> ejbs.LoginManager$417755913$Proxy$_$$_Weld$EnterpriseProxy$ to
> ejbs.LoginManager
>
> I'm trying to programatically retrieve an EJB from the CDI context by using
> its interface and am getting this error message. I've created a sample
> proof-of-concept that is trying to retrieve EJB beans from the CDI context
>
> public <T> T getSesionBean(Class<T> clazz, String name) {
> Properties properties = new Properties();
>
> try {
> InitialContext initContext = new InitialContext();
>
> return clazz.cast(CDI.current().select(clazz).get());
> } catch (Exception e) {
> // TODO Auto-generated catch block
> throw new RuntimeException(e);
> }
> }
>
> It is being called as:
>
> LoginManager login = getSesionBean(LoginManager.class);
>
> with my EJB defined as:
>
> @Stateless(name="LoginManager")
> @Local(LoginManager.class)
> @LocalBinding(jndiBinding="LoginManager")
> public class LoginManagerBean implements LoginManager {
> ...
> ...
> ...
> }
>
> I don't understand it. I'm expecting the bean being retrieved from the
> context to be a proxy. Shouldn't it be castable to my interface? Otherwise,
> how am I supposed to retrieve it?
>
> More interestingly, this does not seem to be a consistent error; sometimes
> the code works fine. Sometimes it fails. I haven't been able to determine
> what makes it work or throw an exception.
>
> I found a related issue here, but not sure if this is the same problem
> and/or which version of Weld is used in JB7EAP. I'm including the following
> dependency in my application:
>
> <dependency>
> <groupId>org.wildfly</groupId>
> <artifactId>wildfly-ejb-client-bom</artifactId>
> <version>10.1.0.Final</version>
> <type>pom</type>
> </dependency>
>
> Am I doing something completely wrong? If this is a Weld bug, can I use a
> different proxy system than Weld? Is this even configurable in undertow?
>
>
> Thanks,
>
>
> Eric
>
>
> _______________________________________________
> undertow-dev mailing list
> undertow-dev(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/undertow-dev
_______________________________________________
undertow-dev mailing list
undertow-dev(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/undertow-dev
--
Martin Kouba
Senior Software Engineer
Red Hat, Czech Republic
2:04 p.m.
Indeed, it was an issue with duplicate copies of the class. But I'm still
not convinced I should be getting this error. Is this a parent-first vs
parent-last class loading issue?
The LoginManager.class is part of my ejbs.jar archive.
In my EAR, I had the following
- ejbs.jar
- webapp.war
\- WEB-INF/lib
\- ejbs.jar
I am deploying the with default classloading mechanism (I believe it is
parent-first). But based on the
https://docs.jboss.org/author/display/WFLY10/Class+Loading+in+WildFly, I
seem to understand that the Local Resources (ie: classes within my WAR)
would have a higher dependence than those from the EAR:
In order of highest priority to lowest priority
1. System Dependencies - These are dependencies that are added to the
module automatically by the container, including the Java EE api's.
2. User Dependencies - These are dependencies that are added through
jboss-deployment-structure.xml or through the Dependencies: manifest
entry.
3. Local Resource - Class files packaged up inside the deployment
itself, e.g. class files from WEB-INF/classes or WEB-INF/lib of a war.
4. Inter deployment dependencies - These are dependencies on other
deployments in an ear deployment. This can include classes in an ear's lib
directory, or classes defined in other ejb jars.
If that is the case, is my problem that I have the EJB implementation class
in my WAR as well? Is my war only supposed to have a copy of the
LoginManager interface and not the actual impl code as well? Wouldn't that
still cause an issue in that my EJB interface and implementation is in the
root/ejbs.jar and I have an additional copy of the interface in my war?
Thanks,
Eric
On Mon, Apr 17, 2017 at 6:01 PM, Stuart Douglas <sdouglas(a)redhat.com> wrote:
It sounds like a class loading problem. You likely have two copies
of
ejbs.LoginManager, and somehow you are using the wrong one. If you
look at the output of
System.out.println(LoginManager.class.getClassLoader()) and
System.out.println(CDI.current().select(clazz).get().
getClass().getClassLoader())
it should give you a clue.
This is not an Undertow issue.
Stuart
On Fri, Apr 14, 2017 at 11:52 AM, Eric B <ebenzacar(a)gmail.com> wrote:
> I posted this problem on StackOverflow, but after doing more research,
I'm
> not sure if this is a Weld, JBoss/WildFly or undertow issue. Or whether
its
> a framework issue, or how the framework is being used. If this is not
the
> correct list, can you please let me know which list/group I should be
> directing the issue to?
>
> I'm running into a strange problem and error message that I do not
> understand. I'm running my application on JBoss 7 EAP.
>
> Caused by: java.lang.ClassCastException: Cannot cast
> ejbs.LoginManager$417755913$Proxy$_$$_Weld$EnterpriseProxy$ to
> ejbs.LoginManager
>
> I'm trying to programatically retrieve an EJB from the CDI context by
using
> its interface and am getting this error message. I've created a sample
> proof-of-concept that is trying to retrieve EJB beans from the CDI
context
>
> public <T> T getSesionBean(Class<T> clazz, String name) {
> Properties properties = new Properties();
>
> try {
> InitialContext initContext = new InitialContext();
>
> return clazz.cast(CDI.current().select(clazz).get());
> } catch (Exception e) {
> // TODO Auto-generated catch block
> throw new RuntimeException(e);
> }
> }
>
> It is being called as:
>
> LoginManager login = getSesionBean(LoginManager.class);
>
> with my EJB defined as:
>
> @Stateless(name="LoginManager")
> @Local(LoginManager.class)
> @LocalBinding(jndiBinding="LoginManager")
> public class LoginManagerBean implements LoginManager {
> ...
> ...
> ...
> }
>
> I don't understand it. I'm expecting the bean being retrieved from the
> context to be a proxy. Shouldn't it be castable to my interface?
Otherwise,
> how am I supposed to retrieve it?
>
> More interestingly, this does not seem to be a consistent error;
sometimes
> the code works fine. Sometimes it fails. I haven't been able to determine
> what makes it work or throw an exception.
>
> I found a related issue here, but not sure if this is the same problem
> and/or which version of Weld is used in JB7EAP. I'm including the
following
> dependency in my application:
>
> <dependency>
> <groupId>org.wildfly</groupId>
> <artifactId>wildfly-ejb-client-bom</artifactId>
> <version>10.1.0.Final</version>
> <type>pom</type>
> </dependency>
>
> Am I doing something completely wrong? If this is a Weld bug, can I use a
> different proxy system than Weld? Is this even configurable in undertow?
>
>
> Thanks,
>
>
> Eric
>
>
> _______________________________________________
> undertow-dev mailing list
> undertow-dev(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/undertow-dev
3:44 a.m.
Hi Eric,
I wouldn't recommend to use CDI.current().select() to lookup session
beans at all. From CDI POV, if you do a lookup from the ejbs.jar you
should not see the bean from the webapp.war.
Also note that having a class deployed in two different bean archives is
non-portable, see also 12.1. Bean archives:
"If a bean class is deployed in two different bean archives,
non-portable behavior results...". [1] In real life having this causes
similar CL/casting issues, esp. in EARs.
In any case, this is not an Undertow issue and we should move this
discussion to Weld or WildFly channels.
Martin
[1]
http://docs.jboss.org/cdi/spec/1.2/cdi-spec.html#bean_archive
Dne 20.4.2017 v 20:04 Eric B napsal(a):
Indeed, it was an issue with duplicate copies of the class. But
I'm
still not convinced I should be getting this error. Is this aou
parent-first vs parent-last class loading issue?
The LoginManager.class is part of my ejbs.jar archive.
In my EAR, I had the following
- ejbs.jar
- webapp.war
\- WEB-INF/lib
\- ejbs.jar
I am deploying the with default classloading mechanism (I believe it is
parent-first). But based on the
https://docs.jboss.org/author/display/WFLY10/Class+Loading+in+WildFly, I
seem to understand that the Local Resources (ie: classes within my WAR)
would have a higher dependence than those from the EAR:
In order of highest priority to lowest priority
1. System Dependencies - These are dependencies that are added to
the module automatically by the container, including the Java EE
api's.
2. User Dependencies - These are dependencies that are added
through jboss-deployment-structure.xml or through
the Dependencies: manifest entry.
3. Local Resource - Class files packaged up inside the deployment
itself, e.g. class files from WEB-INF/classes or WEB-INF/lib of
a war.
4. Inter deployment dependencies - These are dependencies on other
deployments in an ear deployment. This can include classes in an
ear's lib directory, or classes defined in other ejb jars.
If that is the case, is my problem that I have the EJB implementation
class in my WAR as well? Is my war only supposed to have a copy of the
LoginManager interface and not the actual impl code as well? Wouldn't
that still cause an issue in that my EJB interface and implementation is
in the root/ejbs.jar and I have an additional copy of the interface in
my war?
Thanks,
Eric
On Mon, Apr 17, 2017 at 6:01 PM, Stuart Douglas <sdouglas(a)redhat.com
<mailto:sdouglas@redhat.com>> wrote:
It sounds like a class loading problem. You likely have two copies of
ejbs.LoginManager, and somehow you are using the wrong one. If you
look at the output of
System.out.println(LoginManager.class.getClassLoader()) and
System.out.println(CDI.current().select(clazz).get().getClass().getClassLoader())
it should give you a clue.
This is not an Undertow issue.
Stuart
On Fri, Apr 14, 2017 at 11:52 AM, Eric B <ebenzacar(a)gmail.com
<mailto:ebenzacar@gmail.com>> wrote:
> I posted this problem on StackOverflow, but after doing more
research, I'm
> not sure if this is a Weld, JBoss/WildFly or undertow issue. Or
whether its
> a framework issue, or how the framework is being used. If this is
not the
> correct list, can you please let me know which list/group I should be
> directing the issue to?
>
> I'm running into a strange problem and error message that I do not
> understand. I'm running my application on JBoss 7 EAP.
>
> Caused by: java.lang.ClassCastException: Cannot cast
> ejbs.LoginManager$417755913$Proxy$_$$_Weld$EnterpriseProxy$ to
> ejbs.LoginManager
>
> I'm trying to programatically retrieve an EJB from the CDI context
by using
> its interface and am getting this error message. I've created a sample
> proof-of-concept that is trying to retrieve EJB beans from the CDI
context
>
> public <T> T getSesionBean(Class<T> clazz, String name) {
> Properties properties = new Properties();
>
> try {
> InitialContext initContext = new InitialContext();
>
> return clazz.cast(CDI.current().select(clazz).get());
> } catch (Exception e) {
> // TODO Auto-generated catch block
> throw new RuntimeException(e);
> }
> }
>
> It is being called as:
>
> LoginManager login = getSesionBean(LoginManager.class);
>
> with my EJB defined as:
>
> @Stateless(name="LoginManager")
> @Local(LoginManager.class)
> @LocalBinding(jndiBinding="LoginManager")
> public class LoginManagerBean implements LoginManager {
> ...
> ...
> ...
> }
>
> I don't understand it. I'm expecting the bean being retrieved from the
> context to be a proxy. Shouldn't it be castable to my interface?
Otherwise,
> how am I supposed to retrieve it?
>
> More interestingly, this does not seem to be a consistent error;
sometimes
> the code works fine. Sometimes it fails. I haven't been able to
determine
> what makes it work or throw an exception.
>
> I found a related issue here, but not sure if this is the same problem
> and/or which version of Weld is used in JB7EAP. I'm including the
following
> dependency in my application:
>
> <dependency>
> <groupId>org.wildfly</groupId>
> <artifactId>wildfly-ejb-client-bom</artifactId>
> <version>10.1.0.Final</version>
> <type>pom</type>
> </dependency>
>
> Am I doing something completely wrong? If this is a Weld bug, can
I use a
> different proxy system than Weld? Is this even configurable in
undertow?
>
>
> Thanks,
>
>
> Eric
>
>
> _______________________________________________
> undertow-dev mailing list
> undertow-dev(a)lists.jboss.org <mailto:undertow-dev@lists.jboss.org>
> https://lists.jboss.org/mailman/listinfo/undertow-dev
<https://lists.jboss.org/mailman/listinfo/undertow-dev>
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--
Martin Kouba
Senior Software Engineer
Red Hat, Czech Republic
2566
days inactive
2573
days old
4 comments
3 participants
participants (3)
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Stuart Douglas