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From "Michael C (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (POOL-338) GenericObjectPool constructor throws an exception
Date Mon, 09 Apr 2018 15:06:00 GMT

    [ https://issues.apache.org/jira/browse/POOL-338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430654#comment-16430654
] 

Michael C commented on POOL-338:
--------------------------------

I also question using {{Class.forName}} to create {{EvictionPolicy}}. All these class loader
trouble actually makes the API harder to use compare to just a {{setEvictionPolicy(EvictionPolicy<?>)}}
method. For example, you cannot have a class that extends {{GenericObjectPoolConfig}} also
implements {{EvictionPolicy}}, because the former must be instantiated first with all the
customization needed.

> GenericObjectPool constructor throws an exception
> -------------------------------------------------
>
>                 Key: POOL-338
>                 URL: https://issues.apache.org/jira/browse/POOL-338
>             Project: Commons Pool
>          Issue Type: Bug
>    Affects Versions: 2.4.2, 2.4.3, 2.5.0
>         Environment: Java 8, Liferay DXP (an OSGi environment).
>            Reporter: Michael C
>            Priority: Major
>
> Version 2.4.3 GenericObjectPool constructor throws this exception:
> {{java.lang.IllegalArgumentException: [org.apache.commons.pool2.impl.DefaultEvictionPolicy]
does not implement EvictionPolicy}}
> {{    at org.apache.commons.pool2.impl.BaseGenericObjectPool.setEvictionPolicyClassName(BaseGenericObjectPool.java:618)}}
> {{    at org.apache.commons.pool2.impl.GenericObjectPool.setConfig(GenericObjectPool.java:318)}}
> {{    at org.apache.commons.pool2.impl.GenericObjectPool.<init>(GenericObjectPool.java:115)}}
> {{    at org.apache.commons.pool2.impl.GenericObjectPool.<init>(GenericObjectPool.java:88)}}
>  
> Version 2.5.0 throws the same exception. Version 2.4.2 or older's setEvictionPolicyClassName
method fail silently for the same reason. This line in BaseGenericObjectPool evaluates to
false for all versions:
> {{        if (policy instanceof EvictionPolicy<?>) {}}
>  



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