Lombok Builder批注引发UnsupportedOperationException [英] UnsupportedOperationException is thrown with Lombok Builder annotation

问题描述

我正在为项目使用Lombok. 我的模型如下:

I am using Lombok for my project. My model looks like:

@Builder
@Data @AllArgsConstructor
public class ScreenDefinitionDTO {
    @Singular
    private List<ScreenDeclaration> screens;
}

我要执行下一个操作:

String screenName = ctx.screenName().getText();
ScreenDeclaration declaration = ParsingUtils
                .buildScreenDeclaration(StringUtils.trim(screenName));

创建实例的地方:

public static ScreenDefinitionDTO buildEmptyScreenDTO() {
    return ScreenDefinitionDTO.builder()
            .screens(new ArrayList<>())
            .build();
}

最后，我得到了:

Exception in thread "main" java.lang.UnsupportedOperationException
    at java.util.AbstractList.add(AbstractList.java:148)
    at java.util.AbstractList.add(AbstractList.java:108)

当我更改不使用Lombok构建器模式创建实例时，一切都很好:

When I changed creating the instance without Lombok builder pattern everything is fine:

public static ScreenDefinitionDTO buildEmptyScreenDTO() {
    return new ScreenDefinitionDTO(new ArrayList<>());
}

我不明白Lombok的构建器模式出了什么问题?

I couldn't understand what is wrong with Lombok's builder pattern?

推荐答案

由于 GitHub问题

Lombok @Builder主要用于不可变对象(并且使用 Collections.unmodifiablelist或Guava的ImmutableList

Lombok @Builder is primarily meant for immutables (and uses either Collections.unmodifiableList or Guava's ImmutableList

这就是为什么您拥有UnsupportedOperationException

为了更加确定，请在有异常的情况下重现完整的代码模式.

For greater certainty reproduce full code pattern where you have exception please.

这篇关于Lombok Builder批注引发UnsupportedOperationException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！