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https://issues.apache.org/jira/browse/WW-5716?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lukasz Lenart updated WW-5716:
------------------------------
Fix Version/s: 7.4.0
6.12.0
> Bound the per-locale definition caches in the Tiles plugin
> ----------------------------------------------------------
>
> Key: WW-5716
> URL: https://issues.apache.org/jira/browse/WW-5716
> Project: Struts 2
> Issue Type: Improvement
> Reporter: Lukasz Lenart
> Priority: Major
> Fix For: 6.12.0, 7.4.0
>
>
> The Tiles plugin caches parsed definitions per resolved {{Locale}} in two
> maps that grow without limit and are never reduced during the lifetime of the
> web application:
> *
> {{org.apache.tiles.core.definition.dao.CachingLocaleUrlDefinitionDAO#locale2definitionMap}}
> — a {{HashMap}} keyed by {{Locale}}, populated on each cache miss and never
> evicted. It is only cleared when {{checkRefresh}} is enabled and a refresh is
> required, and {{checkRefresh}} is {{false}} by default.
> *
> {{org.apache.tiles.core.definition.pattern.AbstractPatternDefinitionResolver#localePatternPaths}}
> — populated via {{computeIfAbsent}} per locale customization key and never
> swept.
> The {{TilesContainer}} that holds the DAO is stored in application scope, so
> both maps persist for the lifetime of the web application. With the default
> {{StrutsTilesLocaleResolver}}, the resolved locale comes from the
> {{ActionContext}} locale, which derives from {{request.getLocale()}}. In that
> setup the number of distinct cache keys is bounded only by the number of
> distinct locales encountered, and every new locale adds an entry that is
> retained indefinitely, so the caches' memory footprint grows over time with
> no upper bound.
> h3. Proposed change
> Bound both per-locale maps in the plugin's vendored Tiles code — for example
> a configurable maximum size with eviction — and ensure {{localePatternPaths}}
> is bounded/cleared alongside {{locale2definitionMap}}. Both maps sit on the
> same code path, so they must be bounded together; fixing only one leaves the
> other unbounded.
> h3. Notes
> * Affects every version that ships the Tiles plugin; the vendored caching DAO
> is unbounded across all of them.
> * Deployments that pin a fixed locale via {{struts.locale}}, or that enable
> {{struts.locale.validateRequestLocale=true}} (7.3.0+/6.11.0+), already
> constrain the key set. This change makes the plugin robust by default without
> requiring that configuration.
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