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https://issues.apache.org/jira/browse/UIMA-6398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Richard Eckart de Castilho updated UIMA-6398:
---------------------------------------------
Description:
The {{UIMAFramework_impl}} singleton contains a map {{mLoggers}} which caches
all the UIMA logger wrapper classes. The UIMA logger wrapper classes all
inherit from {{org.apache.uima.util.impl.Logger_common_impl}} which in turn
holds a reference to a resource manager.
This resource manager is set in
* {{FlowControllerContainer.initialize}}
* {{PrimitiveAnalysisEngine.initialize}}
* {{Resource_ImplBase.initialize}}
to the resource manager from the {{UIMAContext}} available in the respective
situation. However, the logger wrapper instances cached in
{{UIMAFramework_impl}} are shared globally so that it is very likely in
multi-threaded/multi-classloader that resource managers from different contexts
override each other and that when a message in a given context is logged, the
wrong resource manager is used.
Furthermore, any resources registered in a resource manager that is attached to
a logger won't be garbage collected - at least not until a new resource manager
is set.
!Screenshot 2021-12-09 at 12.42.41.png!
> Classloader paradoxon and memory leak in UIMA loggers
> -----------------------------------------------------
>
> Key: UIMA-6398
> URL: https://issues.apache.org/jira/browse/UIMA-6398
> Project: UIMA
> Issue Type: Bug
> Components: Core Java Framework
> Reporter: Richard Eckart de Castilho
> Assignee: Richard Eckart de Castilho
> Priority: Major
> Fix For: 3.2.1SDK
>
> Attachments: Screenshot 2021-12-09 at 12.42.41.png
>
>
> The {{UIMAFramework_impl}} singleton contains a map {{mLoggers}} which caches
> all the UIMA logger wrapper classes. The UIMA logger wrapper classes all
> inherit from {{org.apache.uima.util.impl.Logger_common_impl}} which in turn
> holds a reference to a resource manager.
> This resource manager is set in
> * {{FlowControllerContainer.initialize}}
> * {{PrimitiveAnalysisEngine.initialize}}
> * {{Resource_ImplBase.initialize}}
> to the resource manager from the {{UIMAContext}} available in the respective
> situation. However, the logger wrapper instances cached in
> {{UIMAFramework_impl}} are shared globally so that it is very likely in
> multi-threaded/multi-classloader that resource managers from different
> contexts override each other and that when a message in a given context is
> logged, the wrong resource manager is used.
> Furthermore, any resources registered in a resource manager that is attached
> to a logger won't be garbage collected - at least not until a new resource
> manager is set.
> !Screenshot 2021-12-09 at 12.42.41.png!
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