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Checker Qual is the set of annotations (qualifiers) and supporting classes used by the Checker Framework to type check Java source code. Please see artifact: org.checkerframework:checker

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package org.checkerframework.dataflow.qual;

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;

/**
 * {@code TerminatesExecution} is a method annotation that indicates that a method terminates the
 * execution of the program. This can be used to annotate methods such as {@code System.exit()}.
 *
 * The annotation enables flow-sensitive type refinement to be more precise. For example, after
 *
 * 
 * if (x == null) {
 *   System.err.println("Bad value supplied");
 *   System.exit(1);
 * }
 * 
 *
 * the Nullness Checker can determine that {@code x} is non-null.
 *
 * The annotation is a trusted annotation, meaning that it is not checked whether the
 * annotated method really does terminate the program.
 *
 * @checker_framework.manual #type-refinement Automatic type refinement (flow-sensitive type
 *     qualifier inference)
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
public @interface TerminatesExecution {}