package org.springframework.lang; 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; @Target({ElementType.METHOD, ElementType.PARAMETER, ElementType.FIELD}) @Retention(RetentionPolicy.RUNTIME) @Documented public @interface NonNull {}