Try jspecify

[FBibonne]

Try jspecify annotations (jspecify.dev) if relevant

[FBibonne]

Try add this diff :

diff --git a/pom.xml b/pom.xml
index fa20695..97e5a0b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -19,6 +19,7 @@
         <maven.compiler.source>17</maven.compiler.source>
         <maven.compiler.target>17</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <error-prone.version>2.41.0</error-prone.version>
     </properties>
 
     <contributors>
@@ -62,6 +63,11 @@
             <artifactId>spring-boot</artifactId>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>org.jspecify</groupId>
+            <artifactId>jspecify</artifactId>
+            <version>1.0.0</version>
+        </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
@@ -90,6 +96,18 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <configuration>
                     <parameters>true</parameters>
+                    <compilerArgs>
+                        <arg>-XDcompilePolicy=simple</arg>
+                        <arg>--should-stop=ifError=FLOW</arg>
+                        <arg>-Xplugin:ErrorProne</arg>
+                    </compilerArgs>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>com.google.errorprone</groupId>
+                            <artifactId>error_prone_core</artifactId>
+                            <version>${error-prone.version}</version>
+                        </path>
+                    </annotationProcessorPaths>
                 </configuration>
             </plugin>
         </plugins>

[FBibonne]

Should also add dependency over nullaway :

• https://techmeup.soprasteria.com/blog/details/dites-adieux-aux-nullpointerexception-dans-java#configuration-maven
• https://github.com/sdeleuze/jspecify-nullaway-demo/blob/maven/pom.xml