[jira] Updated: (COCOON-2036) Throw an exception when circular dependencies in servlet connections are detected.

["Grzegorz Kossakowski (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/COCOON-2036?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Grzegorz Kossakowski updated COCOON-2036:
-----------------------------------------

    Affects version (Component): Parent values: Servlet Service Framework(10175). Level 1 values: 1.0.0-RC1(10313). 
        Fix version (Component): Parent values: Servlet Service Framework(10247). Level 1 values: 1.0.0-RC2-dev(10316). 
                       Priority: Minor  (was: Major)
                        Summary: Throw an exception when circular dependencies in servlet connections are detected.  (was: Handle circular dependencies in servlet connections)

> Throw an exception when circular dependencies in servlet connections are detected.
> ----------------------------------------------------------------------------------
>
>                 Key: COCOON-2036
>                 URL: https://issues.apache.org/jira/browse/COCOON-2036
>             Project: Cocoon
>          Issue Type: Bug
>          Components: - Servlet service framework
>    Affects Versions: 2.2-dev (Current SVN)
>            Reporter: Alexander Klimetschek
>            Assignee: Grzegorz Kossakowski
>            Priority: Minor
>         Attachments: circular-servlet-connections-warning.patch
>
>
> Circular dependencies in servlet connections lead to a Spring exception [1]  in [2] that does not provide any help. The previous implementation (block:) did allow circular dependencies because they were not handled by spring but by custom code.
> Solution would be either to allow them (probably difficult to implement with spring) or, if not, to provide a helpful warning message, that skips this problem. The latter could be a check for embeddedServlet==null and, if not, throw an exception saying "you might have a circular dependency in <servlet-foobar>".
> ---
> [1]:
> The exception is thrown after ServletFactoryBean.getObject() tries to create a proxy for the embeddedServlet, which is null in the case of a circular dependency (one of the circle endpoints is created, but the other will be null).
> Caused by: org.springframework.aop.framework.AopConfigException: Can't proxy null object
>         at org.springframework.aop.framework.ProxyFactory.<init>(ProxyFactory.java:49)
>         at org.apache.cocoon.servletservice.spring.ServletFactoryBean.getObject(ServletFactoryBean.java:194)
>         at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectFromFactoryBean(AbstractBeanFactory.java:1211)
> [2]:
>     public Object getObject() throws Exception {
>         ProxyFactory proxyFactory = new ProxyFactory(this.embeddedServlet);
>         proxyFactory.addAdvice(new ServiceInterceptor());
>         if (this.mountPath != null) {
>             proxyFactory.addAdvisor(new MountableMixinAdvisor());
>         }
>         proxyFactory.addAdvisor(new ServletServiceContextMixinAdvisor());
>         return proxyFactory.getProxy();
>     } 

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