How do you exclude a field from @ToString?

Annotating a specific field with @ToString.Exclude removes just that field from the generated toString() output, while every other field is still included as usual.

@ToString
public class User {
    private String username;

    @ToString.Exclude
    private String password;
}
//  toString() produces "User(username=ada)" - password is omitted

This is the standard way to keep sensitive fields (passwords, tokens, secrets) out of log output, since toString() is frequently what ends up in application logs, whether directly logged or captured incidentally through an object being passed to a logging call. It's good practice to apply this proactively to any field holding sensitive data, rather than discovering the leak after it's already appeared in production logs.

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