Enabling Annotations

IntelliJ IDEA lets you enable annotations in projects locally, through Maven repository for projects imported from Gradle or Maven model and through the editor. .

Enabling annotations in the project

1. Click  to open the project structure dialog.
2. In the Project Structure dialog box, click Libraries.
3. Under that <IntelliJ IDEA home> directory, select redist/annotation .jar, and click OK:

   

4. Click . Select Library Files dialog box opens.
5. If your project contains more than one module, choose the desired module to be modified, and click OK:

   

6. The new library is added to the classpath:

   

Enabling annotations in Gradle or Maven projects

1. Click  to open the project structure dialog.
2. In the Project Structure dialog box, on the Modules page, click the Dependencies tab.
3. On the Dependencies tab, click  and from the list that opens, select Library.
4. In the Choose Library dialog, click New Library and from the Select Library Type list, select From Maven.

   

5. In the Download Library From Maven Repository dialog, enter org.jetbrains:annotations:15.0 that contains annotations for Java 8 or org.jetbrains:annotations-java5:15.0 that contains annotations compatible with Java 5 and click OK.

   

6. In the Choose Libraries dialog box, click Add Selected.

   

   The new library is added to the list of dependencies and to the classpath.

   

Enabling annotations using editor

• In the editor, write @NotNull and press Alt +Enter to invoke Add 'annotations' to classpath action.

  

IntelliJ IDEA will automatically choose Java 5 or Java 8 compatible JAR file based on your project's settings and add the JAR file to the project.

Note that if a project is imported from the Maven model, IntelliJ IDEA will add the dependency to the pom.xml.