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http://jira.codehaus.org/browse/MNG-4273?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Benjamin Bentmann closed MNG-4273.
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Assignee: Benjamin Bentmann
Resolution: Fixed
Fix Version/s: 3.0-alpha-3
Fixed in [r802041|http://svn.apache.org/viewvc?view=rev&revision=802041] with
the help of a new classworlds version that allows to selectively import classes
from the parent/core realm.
> [regression] Internal utility classes of core leak into plugin realm
> --------------------------------------------------------------------
>
> Key: MNG-4273
> URL: http://jira.codehaus.org/browse/MNG-4273
> Project: Maven 2
> Issue Type: Bug
> Components: Class Loading, Plugins and Lifecycle
> Affects Versions: 3.0-alpha-2
> Reporter: Benjamin Bentmann
> Assignee: Benjamin Bentmann
> Fix For: 3.0-alpha-3
>
>
> The current class loader hierarchy of 3.x looks like:
> - {{plexus.core}} as root realm with the contents of {{lib/*.jar}}
> - {{plugin: g:a:v}} as child of {{plexus.core}}
> This basically makes {{lib/*.jar}} completely available to the plugin realm,
> including classes that we don't want/need to share with plugins because they
> assist the implementation of the core but not the interop between core and
> plugin.
> The current design gives rise to errors like the linkage error reported in
> [MNGECLIPSE-1487|https://issues.sonatype.org/browse/MNGECLIPSE-1487]:
> - a plugin creates a custom URL class loader (with parent delegation) that
> contains project dependencies, among others xercesImpl, on top of its plugin
> realm
> - the plugin sets the new class loader as TCCL and invokes a tool that wants
> to employ a SAX parser
> - the parser factory of the JRE will search the TCCL for a suitable SAX
> parser and will discover xercesImpl in the TCCL
> - loading of the xerces parser triggers loading of {{XML11Configuration}}
> from the TCCL which inherits from {{ParserConfigurationSettings}}
> - due to parent delegation, the {{ParserConfigurationSettings}} will however
> be loaded from {{plexus.core}} which holds xercesMinimal
> - xercesMinimal provides an incompatbile version of
> {{ParserConfigurationSettings}}, which finally crashes the plugin with a
> linkage error
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