blocks|key|230781|text|您需要包含该类所在的jar。你可以在here上找到它|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|230782|如果使用Maven，您可以添加以下依赖声明：|230783|<dependency>
++<groupId>com.google.code.findbugs</groupId>
++<artifactId>jsr305</artifactId>
++<version>3.0.2</version>
</dependency>|code-block|syntax|javascript|230784|至于Gradle：|230785|dependencies+{
++testImplementation+'com.google.code.findbugs:jsr305:3.0.2'
}|230786|entityMap|0|LINK|mutability|MUTABLE|url|https://mvnrepository.com/artifact/com.google.code.findbugs/jsr305^0|I|4|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

You need to include a jar that this class exists in. You can find it <a href="https://mvnrepository.com/artifact/com.google.code.findbugs/jsr305" rel="noreferrer">here</a>

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

<pre class="lang-xml prettyprint-override"><code>&lt;dependency&gt;
 &lt;groupId&gt;com.google.code.findbugs&lt;/groupId&gt;
 &lt;artifactId&gt;jsr305&lt;/artifactId&gt;
 &lt;version&gt;3.0.2&lt;/version&gt;
&lt;/dependency&gt;
</code></pre>

and for Gradle:

<pre><code>dependencies {
 testImplementation 'com.google.code.findbugs:jsr305:3.0.2'
}
</code></pre>

blocks|key|14493|text|工件已从net.sourceforge.findbugs移动到|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|14494|<dependency>
++++<groupId>com.google.code.findbugs</groupId>
++++<artifactId>jsr305</artifactId>
++++<version>3.0.0</version>
</dependency>|code-block|syntax|javascript|14495|entityMap^0|4|O|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

The artifact has been moved from <code>net.sourceforge.findbugs</code> to

<pre class="lang-xml prettyprint-override"><code>&lt;dependency&gt;
 &lt;groupId&gt;com.google.code.findbugs&lt;/groupId&gt;
 &lt;artifactId&gt;jsr305&lt;/artifactId&gt;
 &lt;version&gt;3.0.0&lt;/version&gt;
&lt;/dependency&gt;
</code></pre>

blocks|key|14528|text|如果您使用的是Gradle，则可以像下面这样包含依赖项：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|14529|repositories+{
++++mavenCentral()
}

dependencies+{
++++compile+group:+'com.google.code.findbugs',+name:+'jsr305',+version:+'3.0.0'
}|code-block|syntax|javascript|14530|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you are using Gradle, you could include the dependency like this:

<pre class="lang-groovy prettyprint-override"><code>repositories {
 mavenCentral()
}

dependencies {
 compile group: 'com.google.code.findbugs', name: 'jsr305', version: '3.0.0'
}
</code></pre>

blocks|key|14560|text|如果有人在尝试编译安卓项目时有这个问题，在android.support.annotation.Nullable中有一个替代的Nullable实现。因此，要注意在import中引用了哪个包。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|14561|entityMap^0|L|Z|29|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

In case someone has this while trying to compile an Android project, there is an alternative Nullable implementation in <code>android.support.annotation.Nullable</code>. So take care which package you've referenced in your <code>import</code>s.

blocks|key|14666|text|如果任何人在构建在IntelliJ+IDEA外部创建的Maven项目时遇到此问题，我使用了以下依赖项而不是答案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|14667|<dependency>
++<groupId>org.jetbrains</groupId>
++<artifactId>annotations</artifactId>
++<version>15.0</version>
</dependency>|code-block|syntax|javascript|14668|使用它将允许项目在IntelliJ+IDEA的基础上构建，并使用Maven.|14669|你可以在here上找到它。|offset|length|14670|entityMap|0|LINK|mutability|MUTABLE|url|https://mvnrepository.com/artifact/org.jetbrains/annotations/15.0^0|0|0|0|4|4|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

If anyone has this issue when building a Maven project created in IntelliJ IDEA externally, I used the following dependency instead of the answer:

<pre class="lang-xml prettyprint-override"><code>&lt;dependency&gt;
 &lt;groupId&gt;org.jetbrains&lt;/groupId&gt;
 &lt;artifactId&gt;annotations&lt;/artifactId&gt;
 &lt;version&gt;15.0&lt;/version&gt;
&lt;/dependency&gt;
</code></pre>

Using this will allow the project to build on IntelliJ IDEA and by itself using Maven.

You can find it <a href="https://mvnrepository.com/artifact/org.jetbrains/annotations/15.0" rel="noreferrer">here</a>.

blocks|key|231088|text|您可以通过在gradle.build中添加以下代码行来添加此代码的最新版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|231089|implementation+group:+'com.google.code.findbugs',+name:+'jsr305',+version:+'3.0.2'|code-block|syntax|javascript|231090|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

you can add latest version of this by adding following line inside your gradle.build.

<pre><code>implementation group: 'com.google.code.findbugs', name: 'jsr305', version: '3.0.2'
</code></pre>

blocks|key|14617|text|我使用的是包含注释的Guava：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|14618|(Gradle代码)|14619|compile+'com.google.guava:guava:23.4-jre'|code-block|syntax|javascript|14620|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I am using Guava which has annotation included: 

(Gradle code )

<pre><code>compile 'com.google.guava:guava:23.4-jre'
</code></pre>

blocks|key|231070|text|对于Android项目，您可以通过更改项目/模块gradle文件(build.gradle)来修复此错误，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|231071|dependencies+{+implementation+'com.android.support:support-annotations:24.2.0'+}|code-block|syntax|javascript|231072|有关更多信息，请参阅here。|offset|length|231073|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/studio/write/annotations^0|0|0|A|4|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

In the case of Android projects, you can fix this error by changing the project/module gradle file (build.gradle) as follows:

<pre><code>dependencies { implementation 'com.android.support:support-annotations:24.2.0' }
</code></pre>

For more informations, please refer <a href="https://developer.android.com/studio/write/annotations" rel="nofollow noreferrer">here</a>.

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

Can't find @Nullable inside javax.annotation.*

IntelliJ IDEA

Android

我想使用@Nullable注释来消除NullPointerExceptions。我在网上找到了一些教程，我注意到这个注释来自javax.annotation.Nullable包；但是当我导入它时，生成了一个编译错误:找不到符号

问在javax.annotation中找不到@Nullable。*
EN

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问在javax.annotation中找不到@Nullable。*EN

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问在javax.annotation中找不到@Nullable。*
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