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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.checker.initialization.qual;

import org.checkerframework.framework.qual.PolymorphicQualifier;

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;

/**
 * A polymorphic qualifier for the freedom-before-commitment initialization tracking type-system.
 *
 * Any method written using {@link PolyInitialized} conceptually has multiple versions: one in
 * which all instances of {@link PolyInitialized} in the method signature have been replaced by one
 * of the following qualifiers: {@link Initialized}; {@link UnknownInitialization} and {@link
 * UnderInitialization}, which take a class argument to represent different type frames; and {@link
 * FBCBottom}.
 *
 * @checker_framework.manual #initialization-checker Initialization Checker
 * @checker_framework.manual #qualifier-polymorphism Qualifier polymorphism
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@PolymorphicQualifier(UnknownInitialization.class)
public @interface PolyInitialized {}