What is the main cause of incorrect code behavior when using an immutable map? Fields without 'read-only' can be modified HashMap does not preserve element order Excessive use of wrappers causes confusion The 'Immutable' map reflects changes in the original map Incorrect use of the object leads to errors

The main reason for incorrect behavior of code when using an immutable map is that an "immutable" map can reflect changes in the original map if it is created as a wrapper over a mutable collection.

For example, if you use Collections.unmodifiableMap(originalMap), the wrapper itself does not allow modifying the map through it, but if originalMap is changed directly, the changes will be visible through the "immutable" map. This can lead to unexpected behavior.

Other reasons, such as fields without a "read-only" modifier or improper use of the object, can also influence this, but the key point is understanding that an "immutable" map may only be a shallow wrapper, not a full copy.

To avoid this, you should create truly immutable copies, for example, using Map.copyOf() (Java 10+) or libraries that provide immutable collections.