Can't find @Nullable inside javax.annotation.*
JavaAnnotationsNullpointerexceptionNullableNull PointerJava Problem Overview
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
Java Solutions
Solution 1 - Java
You need to include a jar that this class exists in. You can find it here
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>
and for Gradle:
dependencies {
testImplementation 'com.google.code.findbugs:jsr305:3.0.2'
}
Solution 2 - Java
The artifact has been moved from net.sourceforge.findbugs
to
<dependency>
<groupId>com.google.code.findbugs</groupId>
<artifactId>jsr305</artifactId>
<version>3.0.0</version>
</dependency>
Solution 3 - Java
If you are using Gradle, you could include the dependency like this:
repositories {
mavenCentral()
}
dependencies {
compile group: 'com.google.code.findbugs', name: 'jsr305', version: '3.0.0'
}
Solution 4 - Java
JSR-305 is a "Java Specification Request" to extend the specification. @Nullable
etc. were part of it; however it appears to be "dormant" (or frozen) ever since (See this SO question). So to use these annotations, you have to add the library yourself.
FindBugs was renamed to SpotBugs and is being developed under that name.
For maven this is the current annotation-only dependency (other integrations here):
<dependency>
<groupId>com.github.spotbugs</groupId>
<artifactId>spotbugs-annotations</artifactId>
<version>4.2.0</version>
</dependency>
If you wish to use the full plugin, refer to the documentation of SpotBugs.
Solution 5 - Java
In case someone has this while trying to compile an Android project, there is an alternative Nullable implementation in android.support.annotation.Nullable
. So take care which package you've referenced in your import
s.
Solution 6 - Java
If anyone has this issue when building a Maven project created in IntelliJ IDEA externally, I used the following dependency instead of the answer:
<dependency>
<groupId>org.jetbrains</groupId>
<artifactId>annotations</artifactId>
<version>15.0</version>
</dependency>
Using this will allow the project to build on IntelliJ IDEA and by itself using Maven.
You can find it here.
Solution 7 - Java
you can add latest version of this by adding following line inside your gradle.build.
implementation group: 'com.google.code.findbugs', name: 'jsr305', version: '3.0.2'
Solution 8 - Java
I am using Guava which has annotation included:
(Gradle code )
compile 'com.google.guava:guava:23.4-jre'
Solution 9 - Java
In the case of Android projects, you can fix this error by changing the project/module gradle file (build.gradle) as follows:
dependencies { implementation 'com.android.support:support-annotations:24.2.0' }
For more informations, please refer here.
Solution 10 - Java
For gradle build I used compile('com.google.code.findbugs:jsr305:3.0.2')
.
In case of test can use testCompile('com.google.code.findbugs:jsr305:3.0.2')
.