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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.mustcall.qual;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.checkerframework.framework.qual.DefaultFor;
import org.checkerframework.framework.qual.DefaultQualifierInHierarchy;
import org.checkerframework.framework.qual.SubtypeOf;
import org.checkerframework.framework.qual.TypeUseLocation;

/**
 * An expression of type {@code @MustCall({"m1", "m2"})} may be obligated to call {@code m1()}
 * and/or {@code m2()} before it is deallocated, but it is not obligated to call any other methods.
 *
 * This annotation is enforced by the Object Construction Checker's {@code -AcheckMustCall} mode.
 * It enforces that the methods {@code m1()} and {@code m2()} are called on the annotated expression
 * before it is deallocated.
 *
 * 
The subtyping relationship is:
 *
 * 
{@code @MustCall({"m1"}) <: @MustCall({"m1", "m2"})}
 *
 * @checker_framework.manual #must-call-checker Must Call Checker
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf({MustCallUnknown.class})
@DefaultQualifierInHierarchy
@DefaultFor({TypeUseLocation.EXCEPTION_PARAMETER})
public @interface MustCall {
  /**
   * Methods that might need to be called on the expression whose type is annotated.
   *
   * @return methods that might need to be called
   */
  public String[] value() default {};
}