feature: some test with java jsr-305 for java nullability

.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>notNull</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+<!--            <scope>provided</scope>-->
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-core</artifactId>
+            <version>6.1.6</version>
+        </dependency>
+        <dependency>
+            <groupId>io.vavr</groupId>
+            <artifactId>vavr</artifactId>
+            <version>1.0.0-alpha-4</version>
+        </dependency>
+    </dependencies>
+
+</project>

src/main/java/application/Main.java

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+package application;
+
+import io.vavr.control.Option;
+
+public class Main {
+
+    private String field = null;
+
+    public static void main(String[] args) {
+        myFunction("test text");
+        myFunction(null);
+    }
+
+    public static void myFunction(String text) {
+        // DoStuff with text
+        Option<Integer> option = Option.of(1);
+    }
+}

src/main/java/application/NonNullApi.java

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+package application;
+
+import javax.annotation.Nonnull;
+import javax.annotation.meta.TypeQualifierDefault;
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({ElementType.PACKAGE, ElementType.MODULE})
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+@Nonnull
+@TypeQualifierDefault({ElementType.METHOD, ElementType.PARAMETER})
+public @interface NonNullApi {
+}

src/main/java/application/NonNullFields.java

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+package application;
+
+import javax.annotation.Nonnull;
+import javax.annotation.meta.TypeQualifierDefault;
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({ElementType.PACKAGE, ElementType.MODULE})
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+@Nonnull
+@TypeQualifierDefault(ElementType.FIELD)
+public @interface NonNullFields {
+}

src/main/java/application/package-info.java

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+//@ParametersAreNonnullByDefault
+//@NonNullApi
+//@NonNullFields
+package application;
+
+//import org.springframework.lang.NonNullApi;
+//import org.springframework.lang.NonNullFields;
+

src/main/java/application/subpackage/ClassInSubPackage.java

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+package application.subpackage;
+
+public class ClassInSubPackage {
+    private String field = null;
+
+    public void callMyFunction() {
+       myFunction(null);
+    }
+
+    public void myFunction(String text) {
+        // DoStuff with text
+    }
+}

src/main/java/application/subpackage/package-info.java

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+//@ParametersAreNonnullByDefault
+//@NonNullApi
+//@NonNullFields
+package application.subpackage;
+
+//import org.springframework.lang.NonNullApi;
+//import org.springframework.lang.NonNullFields;
+

src/main/java/module-info.java

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+import application.NonNullApi;
+import application.NonNullFields;
+
+//import javax.annotation.ParametersAreNonnullByDefault;
+
+@NonNullApi
+@NonNullFields
+//@ParametersAreNonnullByDefault
+module notNull {
+//    requires spring.core;
+    requires jsr305;
+    requires io.vavr;
+}