SpringValidatorAdapter's ObjectError subclass is not Serializable

[nai2]

Since 5.1.7.RELEASE SerializationFailedException happens when storing BindingResult.getAllErrors() with Redis.

In a1efe3c SpringValidatorAdapter was changed to use anonymous class for ObjectError.
But such the implementation should be avoided because ObjectError implements Serializable.

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Affects: 5.1.7.RELEASE
SEI CERT Oracle Coding Standard for Java