[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-1583) seam:component intercept uses Seam standard rules by default

Magnus Heino (JIRA) jira-events at lists.jboss.org
Mon Jul 2 05:01:57 EDT 2007 

    [ http://jira.jboss.com/jira/browse/JBSEAM-1583?page=comments#action_12367439 ] 
            
Magnus Heino commented on JBSEAM-1583:
--------------------------------------

No, nothing is missing from the stacktrace.

Found the problem, if intercept is true, my class needs to have a no arg constructor. It did not have that since I was using constructor injection. What is the empty constructor needed for here? You said that the seam bean and the spring bean was the same actual instance... so the empty constructor bean is created for what reason? The bean when in use is configured correct, so the constructor injected instance is the one being used...

> seam:component intercept uses Seam standard rules by default
> ------------------------------------------------------------
>
>                 Key: JBSEAM-1583
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-1583
>             Project: JBoss Seam
>          Issue Type: Bug
>          Components: Spring
>    Affects Versions: 2.0.0.BETA1
>            Reporter: Magnus Heino
>         Assigned To: Michael Youngstrom
>
> From spring-seam-2.0.xsd, intercept:
> Determines whether Seam interceptors should be wrapped around a bean, by overriding Seam's default rules. 
> Seldom do you want the seam interceptors wrapped around a sprig singleton.  Auto will use choose no
> interception for a singleton and use Seam standard rules otherwise.
> Looking at the code, I can't find anything about this "no interception for a singleton" default. 
> This bean
> <bean id="processRepository" class="se.lantmateriet.wfl.dataaccess.WsProcessRepository">
>     	<constructor-arg value="http://localhost/avtal/avtalservice.asmx"/>
>     	<seam:component/>
>     </bean>
> fails like this:
> 12:45:35,203 DEBUG [ProxyUtils] Creating proxy for Spring Seam component 'processRepository' using class: se.lantmateriet.wfl.dataaccess.WsProcessRepository
> 12:45:35,282 INFO  [DefaultListableBeanFactory] Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory at 8c2d94: defining beans [org.jboss.seam.ioc.spring.seamComponentPostProcessor,processRepository]; root of factory hierarchy
> 12:45:35,297 ERROR [[/wfl-seam]] Exception sending context initialized event to listener instance of class org.jboss.seam.servlet.SeamListener
> org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processRepository' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Initialization of bean failed; nested exception is org.jboss.seam.InstantiationException: Could not instantiate Seam component: processRepository
> 	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:430)
> 	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:255)
> 	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)
> 	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:252)
> 	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
> 	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:287)
> 	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:689)
> 	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:358)
> 	at org.jboss.seam.ioc.spring.ContextLoader.startupContextLoader(ContextLoader.java:64)
> 	at org.jboss.seam.ioc.spring.ContextLoader.create(ContextLoader.java:43)
> 	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.seam.util.Reflections.invoke(Reflections.java:21)
> 	at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:124)
> 	at org.jboss.seam.Component.callComponentMethod(Component.java:1957)
> 	at org.jboss.seam.Component.callCreateMethod(Component.java:1880)
> 	at org.jboss.seam.Component.newInstance(Component.java:1859)
> 	at org.jboss.seam.contexts.Contexts.startup(Contexts.java:304)
> 	at org.jboss.seam.contexts.Contexts.startup(Contexts.java:278)
> 	at org.jboss.seam.contexts.ServletLifecycle.endInitialization(ServletLifecycle.java:98)
> 	at org.jboss.seam.init.Initialization.init(Initialization.java:508)
> 	at org.jboss.seam.servlet.SeamListener.contextInitialized(SeamListener.java:34)
> 	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3854)
> 	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4359)
> 	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:761)
> 	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:741)
> 	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:553)
> Caused by: org.jboss.seam.InstantiationException: Could not instantiate Seam component: processRepository
> 	at org.jboss.seam.Component.newInstance(Component.java:1853)
> 	at org.jboss.seam.Component.getInstance(Component.java:1756)
> 	at org.jboss.seam.Component.getInstance(Component.java:1735)
> 	at org.jboss.seam.Component.getInstance(Component.java:1729)
> 	at org.jboss.seam.ioc.spring.SeamComponentPostProcessor.postProcessAfterInitialization(SeamComponentPostProcessor.java:49)
> 	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:314)
> 	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1184)
> 	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:407)
> 	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:255)
> 	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)
> 	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:252)
> 	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
> 	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:287)
> 	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:689)
> 	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:358)
> 	at org.jboss.seam.ioc.spring.ContextLoader.startupContextLoader(ContextLoader.java:64)
> 	at org.jboss.seam.ioc.spring.ContextLoader.create(ContextLoader.java:43)
> 	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.seam.util.Reflections.invoke(Reflections.java:21)
> 	at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:124)
> 	at org.jboss.seam.Component.callComponentMethod(Component.java:1957)
> 	at org.jboss.seam.Component.callCreateMethod(Component.java:1880)
> 	at org.jboss.seam.Component.newInstance(Component.java:1859)
> 	at org.jboss.seam.contexts.Contexts.startup(Contexts.java:304)
> 	at org.jboss.seam.contexts.Contexts.startup(Contexts.java:278)
> 	at org.jboss.seam.contexts.ServletLifecycle.endInitialization(ServletLifecycle.java:98)
> 	at org.jboss.seam.init.Initialization.init(Initialization.java:508)
> Caused by: java.lang.InstantiationException: se.lantmateriet.wfl.dataaccess.WsProcessRepository_$$_javassist_0
> 	at java.lang.Class.newInstance0(Class.java:340)
> 	at java.lang.Class.newInstance(Class.java:308)
> 	at org.jboss.seam.ioc.ProxyUtils.enhance(ProxyUtils.java:71)
> 	at org.jboss.seam.ioc.IoCComponent.instantiateJavaBean(IoCComponent.java:94)
> 	at org.jboss.seam.Component.instantiate(Component.java:1154)
> 	at org.jboss.seam.Component.newInstance(Component.java:1849)
> 	at org.jboss.seam.Component.getInstance(Component.java:1756)
> 	at org.jboss.seam.Component.getInstance(Component.java:1735)
> 	at org.jboss.seam.Component.getInstance(Component.java:1729)
> 	at org.jboss.seam.ioc.spring.SeamComponentPostProcessor.postProcessAfterInitialization(SeamComponentPostProcessor.java:49)
> 	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:314)
> 	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1184)
> 	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:407)
> 	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:255)
> 	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)
> 	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:252)
> 	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
> 	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:287)
> 	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:689)
> 	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:358)
> 	at org.jboss.seam.ioc.spring.ContextLoader.startupContextLoader(ContextLoader.java:64)
> 	at org.jboss.seam.ioc.spring.ContextLoader.create(ContextLoader.java:43)
> 	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.seam.util.Reflections.invoke(Reflections.java:21)
> 	at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:124)
> 	at org.jboss.seam.Component.callComponentMethod(Component.java:1957)
> 	at org.jboss.seam.Component.callCreateMethod(Component.java:1880)
> If I change <seam:component/> to <seam:component intercept="false"/> everything works.
> 1. Default for stateless spring beans seems to be true since seam standard rules are applied if intercept is null, that is not defined. bug?
> 2. Why would I want to use intercept="true" anyway? What interceptors will be added?
> 3. Why is it failing with intercept="true"?

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