LinkedCaseInsensitiveMap doesn't implement getOrDefault properly [SPR-13981]

[spring-issuemaster]

Alexey Pomelov opened SPR-13981 and commented

The default getOrDefault method implemented in the java.util.Map interface uses only get and containsKey methods. Within the LinkedCaseInsensitiveMap class these methods work with special form of keys. But getOrDefault method is overriden also in HashMap and LinkedHashMap and it calculates hashes for keys itself.

As a result can get this behavior.
Assuming select a single row via jdbc template with the column IS_SINGLE=Y
Here are results of some method calls to the resulting map:

map.containsKey("is_single") // true
map.containsKey("IS_SINGLE") // true
map.get("is_single") // Y
map.get("IS_SINGLE") // Y
map.getOrDefault("is_single", "N") // N !!!
map.getOrDefault("IS_SINGLE", "N") // Y

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Affects: 4.2.4

Issue Links:

• #19593 LinkedCaseInsensitiveMap does not properly support Java 8's merge() and compute() methods
• #19078 LinkedCaseInsensitiveMap doesn't override HashMap.clone()
• #21126 Inconsistent handling of null values through Java 8 accessors in ConcurrentReferenceHashMap
• #21465 LinkedCaseInsensitiveMap should explicitly implement putIfAbsent and computeIfAbsent

[spring-issuemaster]

Martin Macko commented

I've submitted a PR, that fixes this.

[spring-issuemaster]

Juergen Hoeller commented

Thanks for the report and the pull request, guys! Fixed as part of a slightly wider revision of that class, also handling stored null values correctly.

Juergen