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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 javax.annotation.concurrent;

import java.lang.annotation.*;
import org.checkerframework.checker.lock.qual.LockHeld;
import org.checkerframework.framework.qual.PreconditionAnnotation;

// The JCIP annotation can be used on a field (in which case it corresponds
// to the Lock Checker's @GuardedBy annotation) or on a method (in which case
// it is a declaration annotation corresponding to the Lock Checker's @Holding
// annotation).

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.METHOD, ElementType.FIELD })
@PreconditionAnnotation(qualifier = LockHeld.class)
public @interface GuardedBy {
    /**
     * The Java expressions that need to be held.
     *
     * @see Syntax
     *      of Java expressions
     */
    String[] value() default {};
}