Annotations to declare nonnullness. Findbugs can check that.
'de.pfabulist:nonnullbydefault:1.0'
<dependency>
<groupId>de.pfabulist</groupId>
<artifactId>nonnullbydefault</artifactId>
<version>1.0</version>
</dependency>
<dependency org="de.pfabulist" name="nonnullbydefault" rev="1.0"/>
"de.pfabulist", "nonnullbydefault", "1.0"