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If you are a new learner studying Java, you will learn more about its functions as well as the errors during the lesson. Today, we will search one problem when you find it, it is annotations in Java.
Are you having a problem with ”Can or cannot find the @Nullable inside the javax.annotation”? You have tried to search some web pages to find the method for this issue but still not getting the desired result. Don’t get discouraged about it because this is also part of our research. So check out the workaround below!
What are Annotations in Java?
Annotations which are used to transfer the supplemental information, is mentioned as a program. It starts with ‘@’ and doesn’t adjust the compiled program action.
Annotations assist to combine metadata/ information to the elements of a program such as particular variables, methods, classes, constructors, etc. It isn’t pure comments and they can modify when the compiler treats the program’s function. Annotations support the additional metadata, so it can be a replacement to XML as well as the interfaces of Java markers.
In this session, we will give a problem with Annotations in Java so that you can have the knowledge and practice with the issue if you face it.
You want to handle the annotation of @Nullable to throw out the NullPointerExceptions in Java. You are aware that these annotations are from the javax.annotation.Nullable package as you found it. Even, you applied this advice but it still return the error below. See the next part to find the answer for this issue.
cannot find symbol
Can or cannot find the @Nullable inside the javax.annotation?
The reason
The reason is that there is not @Nullable inside the javax.annotation, so you cannot find it here.
Solution
To solve this probelm, you have to contain a jar and this class endures in. Further information about jar class can be found here. (When distributing application software or libraries on the Java platform, a JAR (Java Archive) is a package file type commonly used to combine numerous Java class files and related metadata and resources (text, pictures, etc.) into one file. A compressed version of.class files, image files, audio files or directories are all contained in a JAR file, to put it simply. A.jar file can be compared to a compressed file (.zip) produced by the WinZip program. Even the WinZip program can be used to extract.jar files’ contents. Since they are lossless, you can utilize them for activities like archive unpacking, decompression, and data compression).
In case of using the Maven, you also can insert the dependency declaration as follow:
<dependency>
<groupId>com.google.code.findbugs</groupId>
<artifactId>jsr305</artifactId>
<version>3.0.2</version>
</dependency>
If it is applied for the following Gradle declaration:
dependencies {
testImplementation 'com.google.code.findbugs:jsr305:3.0.2'
}
From net.sourceforge.findbugs, the artifact has been transferred to:
<dependency>
<groupId>com.google.code.findbugs</groupId>
<artifactId>jsr305</artifactId>
<version>3.0.0</version>
</dependency>
You can add the dependency like the following in the case you are using Gradle:
repositories {
mavenCentral()
}
dependencies {
compile group: 'com.google.code.findbugs', name: 'jsr305', version: '3.0.0'
}
Conclusion
Finally, we have summarized an effective and simple solution for the ”Can or cannot find the @Nullable inside the javax.annotation” problem. Hopefully, this information can help the beginners learning the program know the example of Annotations in Java. Please let us know or have any questions if you need further assistance for your subject. Thanks for reading!
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