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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.common.value.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.SubtypeOf;

/**
 * An annotation indicating the length of an array type.
 * If an expression's type has this annotation, then at run time, the
 * expression evaluates to an array whose length is one of the annotation's
 * arguments.
 *
 * @checker_framework.manual #constant-value-checker Constant Value Checker
 */
@SubtypeOf({ UnknownVal.class })
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.TYPE_PARAMETER, ElementType.TYPE_USE })
public @interface ArrayLen {
    int[] value();
}