The transient keyword in Java indicates that certain fields should not be serialized, preventing sensitive information from being converted into a byte stream during the serialization process.
Marking a field as transient is crucial for security, preventing sensitive data, like passwords, from being serialized, thus mitigating potential security risks.
Using transient enhances performance by excluding non-essential data from serialization, such as caches or derived values, which can optimize storage and processing.
In the UserSession example, the password field is marked as transient ensuring that even if the object is serialized, this sensitive information remains secure.
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