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https://issues.apache.org/jira/browse/DERBY-5873?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-5873:
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Issue & fix info: Patch Available
> Avoid unnecessary allocation of Number instances in client/server
> -----------------------------------------------------------------
>
> Key: DERBY-5873
> URL: https://issues.apache.org/jira/browse/DERBY-5873
> Project: Derby
> Issue Type: Improvement
> Components: Network Client, Network Server
> Affects Versions: 10.10.0.0
> Reporter: Knut Anders Hatlen
> Assignee: Knut Anders Hatlen
> Attachments: d5873-1a.diff
>
>
> Java 5 introduced some new static factory methods (called valueOf()) in the
> Number sub-classes, to be used in preference of the constructors unless a
> fresh instance is required. The valueOf() methods are allowed to cache and
> reuse objects, possibly reducing the allocation/gc cost and the memory
> footprint. For example, Integer.valueOf(int) uses a pre-allocated cache for
> values between -128 and +127 by default (the cache size can be tuned with JVM
> flags).
> Now that the server and client code is compiled against Java 5 libraries, we
> should use the valueOf() methods to get those benefits. Note also that Java
> 5 auto-boxing of numbers uses these methods implicitly, so in many cases we
> can just remove the calls to the constructor and the compiler will
> automatically insert the calls for us.
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