$ mkdir -p /tmp/test/example/test && cd "$_/../.."
$ echo 'java=21.0.4-tem' > .sdkmanrc && sdk env
$ printf 'package test;\nimport org.jspecify.annotations.Nullable;\nclass Test {\n  @Nullable Object get() {\n    return null;\n  }\n}\n' > example/Test.java
$ cat example/Test.java
package test;
import org.jspecify.annotations.Nullable;
class Test {
  @Nullable Object get() {
    return null;
  }
}
$ JSPECIFY_VERSION=1.0.0
$ curl -L -O -s https://repo1.maven.org/maven2/org/jspecify/jspecify/$JSPECIFY_VERSION/jspecify-$JSPECIFY_VERSION.jar
$ javac -cp jspecify-$JSPECIFY_VERSION.jar example/Test.java
$ SPOTBUGS_VERSION=4.8.6
$ SB_CONTRIB_VERSION=7.6.4
$ curl -L -O -s https://github.com/spotbugs/spotbugs/releases/download/$SPOTBUGS_VERSION/spotbugs-$SPOTBUGS_VERSION.tgz
$ tar -xzf spotbugs-$SPOTBUGS_VERSION.tgz && rm spotbugs-$SPOTBUGS_VERSION.tgz
$ SPOTBUGS_HOME=spotbugs-$SPOTBUGS_VERSION
$ curl -L -O -s --output-dir $SPOTBUGS_HOME/plugin https://repo1.maven.org/maven2/com/mebigfatguy/fb-contrib/fb-contrib/$SB_CONTRIB_VERSION/fb-contrib-$SB_CONTRIB_VERSION.jar
$ java -jar $SPOTBUGS_HOME/lib/spotbugs.jar -textui -sourcepath example -auxclasspath=./jspecify-$JSPECIFY_VERSION.jar -effort:max -low -longBugCodes example
L C AI_ANNOTATION_ISSUES_NEEDS_NULLABLE AI: Method test.Test.get() that can return null, is missing a @Nullable annotation  At Test.java:[line 5]