This project implements a Spring AOP driven runtime null check for javax.annotation.Nonnull annotated method parameters.

Internally, a @Before pointcut is used to intercept methods that have one or more @Nonnull annotated parameters and check that their values are non-null. This functionality is provided by nullCheck AspectJ advice in com.vlkan.nullcheck.monitor.NullMonitor class.

Dependencies

Using Spring Boot, you can easily setup your project by adding the following dependencies to your pom.xml:

<!-- Spring -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-aop</artifactId>
</dependency>

<!-- JSR 305: Annotations for Software Defect Detection -->
<dependency>
    <groupId>com.google.code.findbugs</groupId>
    <artifactId>jsr305</artifactId>
    <version>3.0.0</version>
</dependency>

For those who do not want to use Spring Boot, they are free to add individual dependencies manually.

Usage

Copy com.vlkan.nullcheck.monitor.NullMonitor to your project, under the directory where you keep your @Aspects -- or just simply go with monitor directory. Whenever you use a method parameter with @Nonnull annotation, it will be intercepted by the aspect.

License

The null-check by Volkan Yazıcı is licensed under the Creative Commons Attribution 4.0 International License.