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Date: Wed, 20 Sep 2006 20:34:44 +0800
From: "Rice Yeh" <riceyeh@gmail.com>
To: dev@cocoon.apache.org
Subject: Re: ClassCastException becuase of different classloaders for a bean
 weaving by springframework
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Seems jetty6:run will automatically add all dependences in pom.xml to
WEB-INF/lib. I get the following information by passing -X to mvn command.

[INFO] Context path = /
[DEBUG] Adding artifact hibernate-3.2.0.cr2.jar for WEB-INF/lib
[DEBUG] Adding artifact jakarta-bcel-20040329.jar for WEB-INF/lib
[DEBUG] Adding artifact excalibur-logger-2.1.jar for WEB-INF/lib
[DEBUG] Adding artifact commons-logging-1.0.4.jar for WEB-INF/lib
[DEBUG] Adding artifact xs-persistence-hibernate-1.0-SNAPSHOT.jar for
WEB-INF/lib
....

On 9/20/06, Rice Yeh <riceyeh@gmail.com> wrote:
>
> Hi,
>   I have a bean created thru. springframeowrk in cocoon. The bean needs 3
> arguments in its contructor to create it as below:
>
>     <bean id="platform" class="xs.school.Platform" scope="singleton">
>         <constructor-arg type="java.lang.String" value="development"/>
>         <constructor-arg type="xs.persistence.Adapter"
> ref="persistenceAdapter"/>
>         <constructor-arg type=" java.util.Locale"><util:constant
> static-field="java.util.Locale.TAIWAN"/></constructor-arg>
>     </bean>
>
>     <bean id="persistenceAdapter" class="xs.selection.HibernateAdapter ">
>         <property name="settings" value="hibernate.cfg.xml"/>
>     </bean>
>
> I find xs.persistence.Adapter 's (which is an interface) classloader is
> WebAppClassLoader. The real adapter implemenation is called HibernateAdapter
> whose classloader is DefaultClassLoader. So a ClassCastException is thrown
> when assigning the instance of HibernateAdapter (which implements Adapter,
> surely) to the second argument shown beflow. Adapter and HibernateAdapter
> are in two different jars but both are in WEB-INF/cocoon/lib. Should not all
> classes in jars under WEB-INF/cocoon/lib loaded by the same classloader
> (DefaultClassLoader)?
>
> Caused by:
> org.springframework.beans.factory.UnsatisfiedDependencyException: Err
> or creating bean with name 'platform' defined in URL
> [file:C:/tmp/cocoon/xs-scho
> ol-cocoon/src/main/resources/META-INF/spring/application.xml]: Unsatisfied
> depen
> dency expressed through constructor argument with index 1 of type [
> xs.persistenc
> e.Adapter]: Could not convert constructor argument value [
> xs.selection.Hibernate
> Adapter@779f5e] to required type [xs.persistence.Adapter ]: Failed to
> convert val
> ue of type [xs.selection.HibernateAdapter] to required type [
> xs.persistence.Adap
> ter]; nested exception is java.lang.IllegalArgumentException: No matching
> editor
> s or conversion strategy found
>         at
> org.springframework.beans.factory.support.ConstructorResolver.createA
> rgumentArray(ConstructorResolver.java:375)
>         at
> org.springframework.beans.factory.support.ConstructorResolver.autowir
> eConstructor( ConstructorResolver.java:126)
>         at
> org.springframework.beans.factory.support.AbstractAutowireCapableBean
> Factory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:548)
>         at
> org.springframework.beans.factory.support.AbstractAutowireCapableBean
> Factory.createBean(AbstractAutowireCapableBeanFactory.java:352)
>         at
> org.springframework.beans.factory.support.AbstractBeanFactory$1.getOb
> ject(AbstractBeanFactory.java:240)
>         at
> org.springframework.beans.factory.support.DefaultSingletonBeanRegistr
> y.getSingleton(DefaultSingletonBeanRegistry.java:132)
>         at
> org.springframework.beans.factory.support.AbstractBeanFactory.getBean
> (AbstractBeanFactory.java:237)
>         at
> org.springframework.beans.factory.support.AbstractBeanFactory.getBean
> (AbstractBeanFactory.java:153)
>         at
> org.springframework.beans.factory.support.DefaultListableBeanFactory.
> preInstantiateSingletons(DefaultListableBeanFactory.java:254)
>         at
> org.springframework.context.support.AbstractApplicationContext.refres
> h(AbstractApplicationContext.java:337)
>         at
> org.springframework.web.context.support.AbstractRefreshableWebApplica
> tionContext.refresh(AbstractRefreshableWebApplicationContext.java:156)
>         at
> org.springframework.web.context.ContextLoader.createWebApplicationCon
> text(ContextLoader.java:246)
>         at
> org.springframework.web.context.ContextLoader.initWebApplicationConte
> xt(ContextLoader.java:184)
>         at
> org.springframework.web.context.ContextLoaderListener.contextInitiali
> zed(ContextLoaderListener.java:49)
>         at org.apache.cocoon.bootstrap.servlet.ShieldingListener.invoke
> (Shieldin
> gListener.java:151)
>         ... 32 more
>
>
> Rice
>

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Seems jetty6:run will automatically add all dependences in pom.xml to WEB-INF/lib. I get the following information by passing -X to mvn command.<br><br>[INFO] Context path = /<br>[DEBUG] Adding artifact hibernate-3.2.0.cr2.jar
 for WEB-INF/lib<br>[DEBUG] Adding artifact jakarta-bcel-20040329.jar for WEB-INF/lib<br>[DEBUG] Adding artifact excalibur-logger-2.1.jar for WEB-INF/lib<br>[DEBUG] Adding artifact commons-logging-1.0.4.jar for WEB-INF/lib
<br>[DEBUG] Adding artifact xs-persistence-hibernate-1.0-SNAPSHOT.jar for WEB-INF/lib<br>....<br><br><div><span class="gmail_quote">On 9/20/06, <b class="gmail_sendername">Rice Yeh</b> &lt;<a href="mailto:riceyeh@gmail.com">
riceyeh@gmail.com</a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi,<br>&nbsp; I have a bean created thru. springframeowrk in cocoon. The bean needs 3 arguments in its contructor to create it as below:
<br><br>&nbsp;&nbsp;&nbsp; &lt;bean id=&quot;platform&quot; class=&quot;xs.school.Platform&quot; scope=&quot;singleton&quot;&gt;
<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &lt;constructor-arg type=&quot;java.lang.String&quot; value=&quot;development&quot;/&gt;<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &lt;constructor-arg type=&quot;xs.persistence.Adapter&quot; ref=&quot;persistenceAdapter&quot;/&gt;<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &lt;constructor-arg type=&quot;
java.util.Locale&quot;&gt;&lt;util:constant static-field=&quot;java.util.Locale.TAIWAN&quot;/&gt;&lt;/constructor-arg&gt;<br>&nbsp;&nbsp;&nbsp; &lt;/bean&gt;<br><br>&nbsp;&nbsp;&nbsp; &lt;bean id=&quot;persistenceAdapter&quot; class=&quot;xs.selection.HibernateAdapter

&quot;&gt;<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &lt;property name=&quot;settings&quot; value=&quot;hibernate.cfg.xml&quot;/&gt;<br>&nbsp;&nbsp;&nbsp; &lt;/bean&gt;<br><br>I find xs.persistence.Adapter 's (which is an interface) classloader is WebAppClassLoader. The real adapter implemenation is called HibernateAdapter whose classloader is DefaultClassLoader. So a ClassCastException is thrown when assigning the instance of HibernateAdapter (which implements Adapter, surely) to the second argument shown beflow. Adapter and HibernateAdapter are in two different jars but both are in WEB-INF/cocoon/lib. Should not all classes in jars under WEB-INF/cocoon/lib loaded by the same classloader (DefaultClassLoader)? 
<br><br>Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Err<br>or creating bean with name 'platform' defined in URL [file:C:/tmp/cocoon/xs-scho<br>ol-cocoon/src/main/resources/META-INF/spring/application.xml]: Unsatisfied depen
<br>dency expressed through constructor argument with index 1 of type [xs.persistenc<br>e.Adapter]: Could not convert constructor argument value [xs.selection.Hibernate<br>Adapter@779f5e] to required type [xs.persistence.Adapter

]: Failed to convert val<br>ue of type [xs.selection.HibernateAdapter] to required type [xs.persistence.Adap<br>ter]; nested exception is java.lang.IllegalArgumentException: No matching editor<br>s or conversion strategy found
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.beans.factory.support.ConstructorResolver.createA<br>rgumentArray(ConstructorResolver.java:375)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.beans.factory.support.ConstructorResolver.autowir<br>eConstructor(
ConstructorResolver.java:126)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.beans.factory.support.AbstractAutowireCapableBean<br>Factory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:548)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.beans.factory.support.AbstractAutowireCapableBean

<br>Factory.createBean(AbstractAutowireCapableBeanFactory.java:352)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.beans.factory.support.AbstractBeanFactory$1.getOb<br>ject(AbstractBeanFactory.java:240)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.beans.factory.support.DefaultSingletonBeanRegistr

<br>y.getSingleton(DefaultSingletonBeanRegistry.java:132)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.beans.factory.support.AbstractBeanFactory.getBean<br>(AbstractBeanFactory.java:237)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.beans.factory.support.AbstractBeanFactory.getBean

<br>(AbstractBeanFactory.java:153)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.beans.factory.support.DefaultListableBeanFactory.<br>preInstantiateSingletons(DefaultListableBeanFactory.java:254)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.context.support.AbstractApplicationContext.refres

<br>h(AbstractApplicationContext.java:337)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.web.context.support.AbstractRefreshableWebApplica<br>tionContext.refresh(AbstractRefreshableWebApplicationContext.java:156)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.web.context.ContextLoader.createWebApplicationCon

<br>text(ContextLoader.java:246)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.web.context.ContextLoader.initWebApplicationConte<br>xt(ContextLoader.java:184)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.springframework.web.context.ContextLoaderListener.contextInitiali

<br>zed(ContextLoaderListener.java:49)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.cocoon.bootstrap.servlet.ShieldingListener.invoke(Shieldin<br>gListener.java:151)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ... 32 more<br><span class="sg"><br><br>Rice<br>

</span></blockquote></div><br>

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