Allow PropertyResolver implementations to ignore unresolvable ${placeholders} [SPR-9569]

[spring-projects-issues]

Chris Beams opened SPR-9569 and commented

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Affects: 3.1 GA

Issue Links:

• Resolve nested ${..} placeholders via PropertyResolver/Environment [SPR-9473] #14108 Resolve nested ${..} placeholders via PropertyResolver/Environment ("depends on")
• Spring3.2 bug context:property-placeholder nested search property appear java.lang.StackOverflowError [SPR-10549] #15180 Spring3.2 bug context:property-placeholder nested search property appear java.lang.StackOverflowError

[spring-projects-issues]

Chris Beams commented

commit 06e34f05a65f93a4bc235ea67ebb9535edc1ee1c
Author: Chris Beams <cbeams@vmware.com>
Commit: Chris Beams <cbeams@vmware.com>

    Allow PropertyResolvers to ignore unresolvable ${placeholders}
    
    Prior to this commit, the PropertyResolver API (and therefore the
    Environment API) allowed callers a choice between
     #resolvePlaceholders and #resolveRequiredPlaceholders for low-level
    ${placeholder} resolution. However, when calling the higher level
     #getProperty variants, users had no control over whether property
    values returned with unresolvable ${placeholders} would result in an
    exception or simply be passed through.
    
    This commit introduces a #setIgnoreUnresolvableNestedPlaceholders
    property via ConfigurablePropertyResolver, defaulting to false, the
    value of which is respected by AbstractPropertyResolver#getProperty
    method implementations. See the new test in
    PropertySourcesPropertyResolverTests for usage examples.
    
    Issue: SPR-9569, SPR-9473