IdentityHashMapUsage
IdentityHashMap usage shouldn't be intermingled with Map

Severity
WARNING
Has Fix?

The problem

java.util.IdentityHashMap uses reference-equality when comparing keys which isn’t what a reader would expect if the type of the variable is java.util.Map. Due to this special nature of IdentityHashMap, we recommend preserving the type of the variable. This means that we shouldn’t type upcast IdentityHashMap to its super classes and always use the default type. This is to make sure that reader/maintainer of the code is aware about it and takes special consideration when invoking any method on them.

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("IdentityHashMapUsage") to the enclosing element.