Lombok: RequiredArgsConstructor not working

问题

It seems that @RequiredArgsConstructor not working in the code below. Why is it?

import java.io.Serializable;

import lombok.Data;
import lombok.RequiredArgsConstructor;

@Data
@RequiredArgsConstructor
public class User implements Serializable {

    private String username;

    /*public User(String username) {
        this.username = username;
    }*/

    private static final long serialVersionUID = 8043545738660721361L;
}

I get the error:

javax.faces.el.EvaluationException: java.lang.Error: Unresolved compilation problem: 
    The constructor User(String) is undefined

For some reason seems it does work for other domain class in which no constructor defined but instead used the @RequiredArgsConstructor annotation.

回答1:

According to Documentation, Required arguments are final fields and fields with constraints such as @NonNull.

You need to make username as @NonNull

@NonNull private String username;

And you need to make them final too.

回答2:

It's also worth noting for future readers that @Data also provides @RequiredArgsConstructor, so using both annotations isn't necessary :)

回答3:

Did you installed Lombok plugin in intellij ?

If not then

File -> Settings -> Plusings: Search for Lombok (CodeStream) version.

Restart the IDE and it should be fixed.

Double Check:

You have Lombok library installed using Maven or Gradle.
Enabled Annotation Processors from intellij IDE from File -> Settings: Search for Annotation Processors

回答4:

Try changing project/module JDK to 1.8.

Project Structure -> Project Settings->Project SDK and Project Language Level

来源：https://stackoverflow.com/questions/37671467/lombok-requiredargsconstructor-not-working

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java

Lombok