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Value is the immutable variant of Data ; all fields are made private and final by default, and setters are not generated. The class itself is also made final by default, because immutability is not something that can be forced onto a subclass. Like Data , useful toString , equals and hashCode methods are also generated, each field gets a getter method, and a constructor that covers every argument except final fields that are initialized in the field declaration is also generated. PRIVATE Getter , except that explicitly including an implementation of any of the relevant methods simply means that part won't be generated and no warning will be emitted. For example, if you write your own toString , no error occurs, and lombok will not generate a toString. Also, any explicit constructor, no matter the arguments list, implies lombok will not generate a constructor. If you do want lombok to generate the all-args constructor, add AllArgsConstructor to the class. You can mark any constructor or method with lombok. Tolerate to hide them from lombok. It is possible to override the final-by-default and private-by-default behavior using either an explicit access level on a field, or by using the NonFinal or PackagePrivate annotations. NonFinal can also be used on a class to remove the final keyword. It is possible to override any default behavior for any of the 'parts' that make up Value by explicitly using that annotation. For classes with generics, it's useful to have a static method which serves as a constructor, because inference of generic parameters via static methods works in java6 and avoids having to use the diamond operator. Various well known annotations about nullity cause null checks to be inserted and will be copied to the relevant places such as the method for getters, and the parameter for the constructor and setters. Value was an experimental feature from v0. It has since been moved into the core package. The old annotation is still around and is an alias. It will eventually be removed in a future version, though. It is not possible to use FieldDefaults to 'undo' the private-by-default and final-by-default aspect of fields in the annotated class. Use NonFinal and PackagePrivate on the fields in the class to override this behaviour. Project Lombok. Get Lombok for Enterprise Value Immutable classes made very easy. Value was introduced as experimental feature in lombok v0. Value no longer implies With since lombok v0. Value promoted to the main lombok package since lombok v0. Overview Value is the immutable variant of Data ; all fields are made private and final by default, and setters are not generated. With Lombok import lombok. AccessLevel; import lombok. NonFinal; import lombok. Value; import lombok. With; import lombok. Vanilla Java import java. Supported configuration keys: lombok.

Lombok and JPA: What may go wrong?

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Any class definition may be annotated with EqualsAndHashCode to let lombok generate implementations of the equals Object other and hashCode methods. By default, it'll use all non-static, non-transient fields, but you can modify which fields are used and even specify that the output of various methods is to be used by marking type members with EqualsAndHashCode. Include or EqualsAndHashCode. Alternatively, you can specify exactly which fields or methods you wish to be used by marking them with EqualsAndHashCode. If applying EqualsAndHashCode to a class that extends another, this feature gets a bit trickier. By setting callSuper to true , you can include the equals and hashCode methods of your superclass in the generated methods. For hashCode , the result of super. Be aware that not all equals implementations handle this situation properly. However, lombok-generated equals implementations do handle this situation properly, so you can safely call your superclass equals if it, too, has a lombok-generated equals method. If you have an explicit superclass you are forced to supply some value for callSuper to acknowledge that you've considered it; failure to do so results in a warning. Setting callSuper to true when you don't extend anything you extend java. Object is a compile-time error, because it would turn the generated equals and hashCode implementations into having the same behaviour as simply inheriting these methods from java. Object : only the same object will be equal to each other and will have the same hashCode. Not setting callSuper to true when you extend another class generates a warning, because unless the superclass has no equality-important fields, lombok cannot generate an implementation for you that takes into account the fields declared by your superclasses. You'll need to write your own implementations, or rely on the callSuper chaining facility. You can also use the lombok. Note that lombok just defers to the. Some well known types have possibly surprising equals implementations. For example, java. BigDecimal considers scale, i. NEW in Lombok 0. Object , lombok generates a canEqual method which means JPA proxies can still be equal to their base class, but subclasses that add new state don't break the equals contract. The complicated reasons for why such a method is necessary are explained in this paper: How to Write an Equality Method in Java. If all classes in a hierarchy are a mix of scala case classes and classes with lombok-generated equals methods, all equality will 'just work'. If you need to write your own equals methods, you should always override canEqual if you change equals and hashCode. NEW in Lombok 1. Be careful though! This is an experimental feature. For more details see the documentation on the onX feature. Do not use this if objects of the annotated class can be modified in any way that would lead to the result of hashCode changing. However, this behaviour is no different from e. You may safely presume that the hashCode implementation used will not change between versions of lombok, however this guarantee is not set in stone; if there's a significant performance improvement to be gained from using an alternate hash algorithm, that will be substituted in a future version. This is analogous to java. Double 's equals method, and is in fact required to ensure that comparing an object to an exact copy of itself returns true for equality. If there is any method named either hashCode or equals , regardless of return type, no methods will be generated, and a warning is emitted instead. These 2 methods need to be in sync with each other, which lombok cannot guarantee unless it generates all the methods, hence you always get a warning if one or both of the methods already exist. You can mark any method with lombok. Tolerate to hide them from lombok. Attempting to exclude fields that don't exist or would have been excluded anyway because they are static or transient results in warnings on the named fields. If a method is marked for inclusion and it has the same name as a field, it replaces the field the method is included, the field is excluded. Prior to lombok 1. This old-style inclusion mechanism is still supported but will be deprecated in the future. You can only include them by marking them with EqualsAndHashCode. If a getter exists for a field to be included, it is called instead of using a direct field reference. If you have configured a nullity annotation flavour via lombok. This is required if you use a NonNullByDefault style annotation in combination with strict nullity checking. Project Lombok. Overview Any class definition may be annotated with EqualsAndHashCode to let lombok generate implementations of the equals Object other and hashCode methods. With Lombok import lombok. Vanilla Java import java. Supported configuration keys: lombok. The annotation parameter ' doNotUseGetters ', if explicitly specified, takes precedence over this setting. If set to skip no such calls are generated. The default behaviour is like skip , with an additional warning.

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