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Forum: Seam Users Forum ListTopic List
03. Nov 2009, 11:32 America/New_York | Link

Hi.

From SiA lists the scope that is used for each type of component if one is not specified in the component definition: 

EJB stateful session bean Conversation
JPA entity class Conversation
EJB stateless session bean Stateless
EJB message driven bean Stateless
JavaBean (POJO) Event

Now this means that a @Stateless should have Stateless as default scope, however when I do @In on that with the scope present it doesnt work.

ie: 

interface foo

@Stateless 
@Name("foo")
@AutoCreate
public class FooImpl implements Foo

Now lets say in a class you try to inject foo. This works fine. 

@In Foo foo;

Now lets say I want to specify the scope directly 

@In(scope=ScopeType.STATELESS) Foo foo;

The latter fails! Why? Shouldn't the scopetype be stateless?

2 Replies:
04. Nov 2009, 05:41 America/New_York | Link

I was able to reproduce the behavior using Seam 2.2.0.GA. Here is the root cause: 

Caused by: java.lang.IllegalArgumentException: cannot specify explicit scope=STATELESS on @In: authenticator.foo
	at org.jboss.seam.Component.getValueToInject(Component.java:2314)
	at org.jboss.seam.Component.injectAttributes(Component.java:1736)
	at org.jboss.seam.Component.inject(Component.java:1554)
	at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:61)
	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
	at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44)
	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
	at org.jboss.seam.persistence.EntityManagerProxyInterceptor.aroundInvoke(EntityManagerProxyInterceptor.java:29)
	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
	at org.jboss.seam.persistence.HibernateSessionProxyInterceptor.aroundInvoke(HibernateSessionProxyInterceptor.java:30)
	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
	at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
	at org.jboss.seam.intercept.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:50)
	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.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:118)
	at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:126)
	... 113 more

Why is it illegal to specify explicit scope=STATELESS on @In?

Additional experimentation reveals... 

@In(create=true, scope=ScopeType.CONVERSATION)
    private Foo foo;
Caused by: java.lang.IllegalArgumentException: cannot combine create=true with explicit scope on @In: authenticator.foo
	at org.jboss.seam.Component.getValueToInject(Component.java:2307)
	at org.jboss.seam.Component.injectAttributes(Component.java:1736)
	at org.jboss.seam.Component.inject(Component.java:1554)
	at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:61)
	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
	at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44)
	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
	at org.jboss.seam.persistence.EntityManagerProxyInterceptor.aroundInvoke(EntityManagerProxyInterceptor.java:29)
	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
	at org.jboss.seam.persistence.HibernateSessionProxyInterceptor.aroundInvoke(HibernateSessionProxyInterceptor.java:30)
	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
	at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
	at org.jboss.seam.intercept.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:50)
	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.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:118)
	at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:126)
	... 113 more

Why is this illegal?

 

Java EE 6 + RevCo = distributed rock stardom!
04. Nov 2009, 08:46 America/New_York | Link

Hi Arbi, thanks for the reply.

My guess is that (and this is kinda far fetched), maybe Seam in Action has a typo here? Maybe the information is incorrect. Perhaps the default scope of a @Stateless is something entirely different.