在javax.annotation中找不到@ Nullable.* [英] Can't find @Nullable inside javax.annotation.*

问题描述

我想使用@Nullable注释消除NullPointerExceptions. 我在网上找到了一些教程，我注意到此批注来自软件包javax.annotation.Nullable. 但是当我导入它时，会生成一个编译错误:找不到符号

I want use @Nullable annotation to eliminate NullPointerExceptions. I found some tutorials on the net, I noticed that this annotation comes from the package javax.annotation.Nullable; but when I import it a compilation error is generated: cannot find symbol

推荐答案

您需要包括一个存在该类的jar.您可以找到它

You need to include a jar that this class exists in. You can find it here

如果使用Maven，则可以添加以下依赖项声明:

If using Maven, you can add the following dependency declaration:

<dependency>
  <groupId>com.google.code.findbugs</groupId>
  <artifactId>jsr305</artifactId>
  <version>3.0.2</version>
</dependency>

并针对Gradle:

dependencies {
  testImplementation 'com.google.code.findbugs:jsr305:3.0.2'
}

这篇关于在javax.annotation中找不到@ Nullable.*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！