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http://jira.codehaus.org/browse/MHIBERNATE-63?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_115340
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James Olsen commented on MHIBERNATE-63:
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To work around this I have to use a different empty subclass of the tool within
each execution.
> Cannot run multiple executions and have custom tool
> ---------------------------------------------------
>
> Key: MHIBERNATE-63
> URL: http://jira.codehaus.org/browse/MHIBERNATE-63
> Project: Maven 2.x Hibernate Plugin
> Issue Type: Bug
> Affects Versions: 2.0-alpha-2
> Reporter: James Olsen
> Assignee: Johann Reyes
>
> If the plugin is configured to have multiple executions you cannot use a
> hibernate toolclass such as:
> <hibernatetool.reveng.toolclass>
> com.xxx.hibernate.tools.reveng.ReverseEngineeringTool
> </hibernatetool.reveng.toolclass>
> The second execution will fail with an error as shown below. This seems to
> be a ClassLoader issue. I think FreeMarker is using a static/singleton cache
> of method information and is loaded with the plugin ClassLoader. The tool
> however is loaded via a different ClassLoader managed by the plugin. During
> the second execution FreeMarker determines that the tool class has been
> reloaded via a different ClassLoader and therefore it's cached copy of method
> info for the tool could be wrong so it clears it's caches - unfortunately it
> clears all of it's cached info! It is then unable to find method info for
> anything.
> I've tried placing the tool class in a separate jar in the plugin's
> extensions but the plugin doesn't look in that ClassLoader when trying to
> load tools.
> 11:17:53,090 INFO freemarker.beans - Detected a reloaded class
> [com.xxx.hibernate.tools.reveng.ReverseEngineeringTool]. Clearing
> BeansWrapper caches.
> 11:17:53,090 ERROR freemarker.runtime - get(getMetaAttribAsBool) failed on
> instance of org.hibernate.tool.hbm2x.pojo.EntityPOJOClass
> The problematic instruction:
> ----------
> ==> if pojo.getMetaAttribAsBool(property, "gen-property", true) [on line 3,
> column 1 in src/main/resources/pojo-query-keys/PojoPropertyAccessors.ftl]
> in include "PojoPropertyAccessors.ftl" [on line 4, column 1 in
> src/main/resources/pojo-query-keys/Pojo.ftl]
> ----------
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