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Jspecify provides a set of annotations to explicitly declare the nullness expectations of the Java code.
Reviews Java 25 and Spring Boot 4 codebases, PRs, files, and modules for migration risks, architecture violations, JSpecify null-safety, security flaws, performance regressions, and Spring Data pitfalls.
Develops custom Checkstyle checks, filters, and plugin integrations for project-specific Java code standards.
Enables nullable reference types in C# projects/solutions and resolves CS86xx warnings systematically. For migrating existing codebases project-wide or file-by-file.
Share bugs, ideas, or general feedback.
Jspecify provides a set of annotations to explicitly declare the nullness expectations of the Java code.
If you are using Maven, then add the jspecify dependency in pom.xml.
In pom.xml, update or add the maven-compiler-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>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.14.1</version>
<configuration>
<release>25</release>
<encoding>UTF-8</encoding>
<fork>true</fork>
<compilerArgs>
<arg>-XDcompilePolicy=simple</arg>
<arg>--should-stop=ifError=FLOW</arg>
<arg>-Xplugin:ErrorProne -XepDisableAllChecks -Xep:NullAway:ERROR -XepOpt:NullAway:OnlyNullMarked -XepOpt:NullAway:JSpecifyMode=true</arg>
<arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED</arg>
<arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED</arg>
<arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED</arg>
<arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED</arg>
<arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED</arg>
<arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED</arg>
<arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED</arg>
<arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED</arg>
<arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED</arg>
<arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED</arg>
</compilerArgs>
<annotationProcessorPaths>
<path>
<groupId>com.google.errorprone</groupId>
<artifactId>error_prone_core</artifactId>
<version>2.42.0</version>
</path>
<path>
<groupId>com.uber.nullaway</groupId>
<artifactId>nullaway</artifactId>
<version>0.12.12</version>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
</plugins>
</build>
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 "4.3.0"
}
tasks.withType(JavaCompile).configureEach {
options.errorprone {
disableAllChecks = true // Other error prone checks are disabled
option("NullAway:OnlyNullMarked", "true") // Enable nullness checks only in null-marked code
error("NullAway") // bump checks from warnings (default) to errors
option("NullAway:JSpecifyMode", "true") // https://github.com/uber/NullAway/wiki/JSpecify-Support
}
// Keep a JDK 25 baseline
options.release = 25
}
dependencies {
implementation("org.jspecify:jspecify:1.0.0")
errorprone("com.google.errorprone:error_prone_core:2.42.0")
errorprone("com.uber.nullaway:nullaway:0.12.12")
}
In every java package under the application main source code (src/main/java),
create package-info.java if not exists already, and add the @NullMarked annotation as follows:
@org.jspecify.annotations.NullMarked
package com.mycompnay.myproject;
If package-info.java file already exists, update the file to add @org.jspecify.annotations.NullMarked annotation.
DO NOT REMOVE ANY OTHER EXISTING CODE IN package-info.java FILE.
If python is installed, after adding the jSpecify support, run scripts/verify_nullmarked.py
to check if all non-empty packages has package-info.java file or not.