Additional Notes
What are the risks of using stateful instance variables in a Singleton service?
Track: Java
Topic: Spring Core
Focus: Bean Scope
Java: Bean Scope
Answer
Concurrency issues can arise. Frame the concept in practical terms so you can explain it during interview discussion.
When a Singleton bean uses stateful instance variables, it can lead to concurrency issues because multiple threads could modify the state simultaneously. This can cause unpredictable behavior. For example, if a Singleton bean in an e-commerce application keeps track of the current user's cart as an instance variable, multiple users could inadvertently share the same cart data.
When a Singleton bean uses stateful instance variables, it can lead to concurrency issues because multiple threads could modify the state simultaneously. This can cause unpredictable behavior. For example, if a Singleton bean in an e-commerce application keeps track of the current user's cart as an instance variable, multiple users could inadvertently share the same cart data.
Topics: Bean Scope Java Spring Core