How do different retention policies affect my annotations?

by

  • RetentionPolicy.SOURCE: Discard during
    the compile. These annotations don’t
    make any sense after the compile has
    completed, so they aren’t written to
    the bytecode.
    Example: @Override, @SuppressWarnings

  • RetentionPolicy.CLASS: Discard during
    class load. Useful when doing
    bytecode-level post-processing.
    Somewhat surprisingly, this is the
    default.

  • RetentionPolicy.RUNTIME: Do not
    discard. The annotation should be
    available for reflection at runtime.
    Example: @Deprecated

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