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 注释来消除 NullPointerExceptions.网上找了一些教程，发现这个注解来自包javax.annotation.Nullable;但是当我导入它时会产生编译错误: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

你需要包含这个类所在的jar.你可以找到它这里

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

如果使用Maven，可以添加如下依赖声明:

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>

对于 Gradle:

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

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