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https://issues.apache.org/jira/browse/WICKET-5535?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Grigorov resolved WICKET-5535.
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Resolution: Fixed
Fix Version/s: 7.0.0
Improving only in master branch because String#intern() is safer to be used
with Java 7+
> Intern strings generated by Wicket that have bigger chance to be duplicated
> ---------------------------------------------------------------------------
>
> Key: WICKET-5535
> URL: https://issues.apache.org/jira/browse/WICKET-5535
> Project: Wicket
> Issue Type: Improvement
> Components: wicket
> Affects Versions: 7.0.0
> Reporter: Martin Grigorov
> Assignee: Martin Grigorov
> Fix For: 7.0.0
>
>
> I've been doing some performance measurements recently and I've noticed that
> Wicket produces some higher number of String objects like:
> - small numbers ("1", "2", "3", ...) generated from repeaters'
> String.valueOf(nextId)
> - HTML element names/attributes ("span", "div", ...) generated in
> XmlTag#getName, #getAttribute, ...
> We can reduce memory usage for those by using String#intern().
> Since Java 7 the interned strings are stored in the Heap memory so this won't
> affect negatively the perm generation.
> Interned strings are GC-ed so this is also not a concern.
> http://java-performance.info/string-intern-in-java-6-7-8/ provides good
> explanation how to avoid the CPU penalty caused by String#intern() if needed.
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