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https://issues.apache.org/jira/browse/OPENJPA-219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12489536
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Patrick Linskey commented on OPENJPA-219:
-----------------------------------------
Note that we invoke Class.getDeclaredField() (and Class.getDeclaredMethod()) in
a number of places. We should take care to replace all the uses of that method
with our optimized version.
> Reflection: negative caching would be beneficial in redeployment scenarios
> --------------------------------------------------------------------------
>
> Key: OPENJPA-219
> URL: https://issues.apache.org/jira/browse/OPENJPA-219
> Project: OpenJPA
> Issue Type: Bug
> Components: kernel
> Affects Versions: 0.9.0, 0.9.6, 0.9.7
> Reporter: Patrick Linskey
> Fix For: 0.9.8
>
>
> In a variety of situations, OpenJPA searches class hierarchies for fields.
> These searches invoke Class.getDeclaredField() in order to find non-public
> fields. This method throws an exception when it fails to find the specified
> field, and the exception creation is, as ever, slow.
> It would be useful to create a static (and thus per-classloader)
> Map<WeakReference<Class>,Collection<String>> of fields known not to be
> available in a given class.
> It may also be beneficial to maintain a cache of which fields *are* present
> in a given class, but this issue is being filed as a result of a demonstrated
> performance hit during deployment due to the lack of a negative cache. If we
> obtain quantitative data indicating that a positive cache would be useful, we
> might want to implement such a thing at that time.
> Trace 3 (2115 occurances): [excepti][00090] java/lang/NoSuchFieldException:
> domainName
> at
> java/lang/Class.getDeclaredField(Ljava/lang/String;I)Ljava/lang/reflect/Field;(Unknown
> Source)
> at
> org/apache/openjpa/enhance/Reflection.findField(Ljava/lang/Class;Ljava/lang/String;Z)Ljava/lang/reflect/Field;(Reflection.java:101)
> at
> org/apache/openjpa/util/ApplicationIds.toPKValues(Ljava/lang/Object;Lorg/apache/openjpa/meta/ClassMetaData;)[Ljava/lang/Object;
> (ApplicationIds.java:89)
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