What are the considerations and best practices for using @Primary in projects with multiple beans and dependencies?

  • Use @Primary to define a default bean when no qualifier is specified.
  • Avoid using @Primary when there are multiple beans of the same type.
  • Always use @Primary to ensure the bean is selected in all cases.
  • Use @Primary only with setter-based injection, not constructor injection.
In projects with multiple beans and dependencies, @Primary should be used to define a default bean when no qualifier is specified. This provides a clear choice when there is ambiguity. However, it should be used judiciously, especially when there are multiple beans of the same type. It should not be overused, as it can lead to unexpected behavior. The other options do not accurately represent best practices for using @Primary.
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