jspecify-skill

Jspecify provides a set of annotations to explicitly declare the nullness expectations of the Java code.

Add jSpecify support in Maven projects

If you are using Maven, then add the jspecify dependency in pom.xml. In pom.xml, update or add the nullability-maven-plugin, to include the following configuration.

<dependencies>
    <dependency>
        <groupId>org.jspecify</groupId>
        <artifactId>jspecify</artifactId>
        <version>1.0.0</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>am.ik.maven</groupId>
            <artifactId>nullability-maven-plugin</artifactId>
            <version>0.4.2</version>
            <extensions>true</extensions>
            <configuration>
                <checking>tests</checking>
                <outputDirectory>${project.basedir}/src/main/java</outputDirectory>
                <testOutputDirectory>${project.basedir}/src/test/java</testOutputDirectory>
            </configuration>
            <executions>
                <execution>
                    <goals>
                        <goal>configure</goal>
                        <goal>generate-package-info</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

Add jSpecify support in Gradle projects

If you are using Gradle, then add the jspecify dependency. In build.gradle or build.gradle.kts, update or add the following jspecify configuration.

plugins {
    id("net.ltgt.errorprone") version "5.1.0"
    id("net.ltgt.nullaway") version "3.1.0"
}

tasks.withType(JavaCompile).configureEach {
    options.errorprone {
        disableAllChecks = true // Other error prone checks are disabled
        error("RequireExplicitNullMarking") // Require @NullMarked or @NullUnmarked on everything
        nullaway {
            error()
        }
    }
    // Keep a JDK 25 baseline
    options.release = 25
}

nullaway {
    onlyNullMarked = true
    jspecifyMode = true
}

dependencies {
    implementation("org.jspecify:jspecify:1.0.0")
    errorprone("com.google.errorprone:error_prone_core:2.50.0")
    errorprone("com.uber.nullaway:nullaway:0.13.7")
}